For 1990-2009 cars only
3X Crank Sensor: Indicates engine RPM based on the 3X
reference signal input to the powertrain control module (PCM).
18X Crank Sensor: Indicates engine RPM based on the 18X reference signal input to the powertrain control module (PCM).
1-2 Solenoid Circuit Status: Indicates the diagnostic state of the 1-2 solenoid control circuit. The scan tool displays Fault, OK, or Invalid State.
2-3 Solenoid Circuit Status: Indicates the diagnostic state of the 2-3 solenoid control circuit. The scan tool displays Fault, OK, or Invalid State.
A/C High Side Pressure Sensor: The scan tool displays 0-5 volts. Represents the A/C refrigerant pressure sensor signal. The amount of pressure indicates the amount of load that the A/C compressor is placing on the engine. The powertrain control module (PCM) uses this information in order to adjust idle and to control the cooling fans.
A/C Off For WOT: The scan tool displays YES or NO. Indicates whether A/C is commanded OFF due to wide open throttle.
A/C Pressure Disable: The scan tool displays YES or NO. Indicates whether A/C is commanded OFF due to excessive or insufficient pressure.
A/C Relay Circuit Status: The scan tool displays OK, Fault, or Invalid State. Indicates the diagnostic state of the A/C relay control circuit.
A/C Relay Command: The scan tool displays ON or OFF. Indicates intended powertrain control module (PCM) output to the A/C relay.
Air Fuel Ratio: The scan tool range is 0-25.5. Air fuel ratio indicates the powertrain control module (PCM) commanded value. In Closed Loop, air fuel ratio should normally be around 14.2-14.7. A lower air fuel ratio indicates a richer commanded mixture, which may be seen during power enrichment or three-way catalyst (TWC) protection modes. A higher air fuel ratio indicates a leaner commanded mixture. This can be seen during decel fuel mode.
AIR Pump Relay Circuit Status: Indicates the diagnostic state of the output driver for the secondary air injection (AIR) pump relay control circuit. The scan tool displays Fault, OK, or Invalid State.
AIR Pump Relay Command: Indicates the commanded state of the secondary air injection (AIR) pump relay. The scan tool displays ON or OFF.
AIR Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the secondary air injection (AIR) solenoid control circuit. The scan tool displays Fault, OK, or Invalid State.
AIR Solenoid Command: Indicates the commanded state of the secondary air injection (AIR) solenoid. The scan tool displays ON or OFF.
BARO: The scan tool range is 10-105 kPa/0-5 volts. The barometric pressure reading is determined from the manifold absolute pressure (MAP) sensor signal monitored during key up and wide open throttle (WOT) conditions. Barometric pressure is used to adjust fuel delivery and spark advance to compensate for altitude changes.
CMP Sensor Signal Present: Indicates if the powertrain control module (PCM) is receiving the cam sensor reference signal from the ignition control module. The scan tool displays YES or NO.
Cruise Control Active: The scan tool displays YES or NO. Represents the state of the Cruise Status Input form the SMCC module. Cruise should not display YES unless the vehicle is operating in cruise control.
Cruise Inhibit Reason: Scan tool displays VEHICLE SPEED, BRAKE, or CLUTCH. Indicated the reason cruise is being inhibited.
Cruise Inhibit Signal Circuit Status: Indicates the diagnostic state of the output driver for the cruise inhibit signal circuit. The scan tool displays Fault, OK, or Invalid State.
Cruise Inhibit Signal Command: Indicates if cruise is being inhibited. The scan tool displays ON or OFF.
Current Gear: The scan tool displays numbers 1, 2, 3, or 4. The powertrain control module (PCM) looks at trans range position and the gear commanded by the PCM. The actual forward gear that the transaxle is in will be the lower of the two because the manual valve can override the PCM commanded gear.
Cycles of Misfire Data: The scan tool range is 0-99 counts. Indicates the total number of cylinder firing events that were detected as being misfires during the last 200 crankshaft revolution sample period.
Cyl. 1-6 Injector Circuit History: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.
Cyl. 1-6 Injector Circuit Status: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.
Decel Fuel Cutoff: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the powertrain control module (PCM) has detected conditions appropriate to operate in deceleration fuel mode. The PCM will command deceleration fuel mode when a sudden decrease in throttle position has been detected while the vehicle is traveling over 40 km/h (25 mph). While in deceleration fuel mode, the PCM will decrease the amount of fuel delivered by entering Open Loop and decreasing the injector pulse width.
Desired EGR Position: The scan tool displays volts or a range from 0-100 percent. Represents the exhaust gas recirculation (EGR) pintle position that the powertrain control module (PCM) is commanding. The desired EGR position should stay close to the EGR position sensor.
Desired Idle Speed: The scan tool range is 0-3187 RPM. Represents the idle speed that is commanded by the powertrain control module (PCM). The PCM will compensate for various engine loads based on engine coolant temperature to keep the engine at the desired idle speed.
Driver Module 1 Status: Indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 2 Status: Indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 3 Status: Indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 4 Status: Driver Module 4 Status indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
ECT Sensor: The scan tool range is -40°C to +151°C (-40°F to +304°F). The engine coolant temperature (ECT) sensor is mounted in the coolant stream. The powertrain control module (PCM) applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold, internal resistance high, the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
EGR Flow Test Count: The scan tool range is 0-255. Indicates the number of exhaust gas recirculation (EGR) flow test samples collected during the current ignition cycle. The maximum number of samples allowed is 1 during normal operation. If the powertrain control module (PCM) battery feed has been disconnected or a DTC P0401 has been cleared, several EGR flow test samples will be allowed during the next ignition cycle. This is to allow repair verification during a single ignition cycle.
EGR Learned Minimum Position: The scan tool range is 0-5 volts. Represents the learned voltage that the powertrain control module (PCM) uses to determine whether or not the exhaust gas recirculation (EGR) valve is fully closed, 0 percent pintle position. If the desired EGR position is 0 percent and a difference of more than 0.4 volt between EGR feedback and EGR closed valve pintle position is detected, DTC P1406 will set.
EGR Position Sensor: The scan tool range is 0-100 percent. Represents the actual position of the exhaust gas recirculation (EGR) pintle in percent. 0 percent displayed indicates a fully extended pintle, EGR valve closed.
EGR Position Sensor: The scan tool range is 0-5 volts. Indicates the exhaust gas recirculation (EGR) pintle position sensor signal voltage being monitored by the powertrain control module (PCM). A low voltage indicates a fully extended pintle, closed valve. A voltage near 5 volts indicates a fully retracted pintle, open valve.
EGR Position Variance: The scan tool range is 0-100 percent. Indicates the difference between Desired exhaust gas recirculation (EGR) Position and Actual EGR Position currently being monitored by the powertrain control module (PCM). If the EGR Position Variance reaches an unacceptable level, DTC P1406 will set.
EGR Solenoid Circuit History: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.
EGR Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the exhaust gas recirculation (EGR) solenoid circuit. The scan tool displays Fault, OK, or Invalid State.
EGR Solenoid Command: The scan tool range is 0-100 percent. Represents the exhaust gas recirculation (EGR) valve driver pulse width modulation (PWM) signal from the powertrain control module (PCM). A duty cycle of 0 percent indicates that no EGR flow is being commanded. A 100 percent duty cycle indicates maximum EGR flow commanded.
Engine Load: The scan tool range is 0-100 percent. Engine load is calculated by the powertrain control module (PCM) from engine speed and mass air flow (MAF) sensor readings. Engine load should increase with an increase in RPM or air flow.
Engine Oil Level Switch: The scan tool displays OK or LOW. Indicates the oil level as determined by the engine oil level switch.
Engine Oil Life Remaining: The scan tool range is 0-100 percent. Indicates the engine oil life index. The powertrain control module (PCM) calculates engine oil life based upon the number of engine revolutions seen and operating conditions such as calculated oil temperature. Pressing the oil life monitor reset switch will return the displayed engine oil life to 100 percent.
Engine Oil Pressure Switch: The scan tool displays OK or Low. Indicates if the engine oil pressure is above or below the minimum desired value.
Engine Run Time: The scan tool range is 00:00:00-99:99:99 Hrs:Min:Sec. Indicates the time elapsed since the engine was started. If the engine is stopped, ENGINE RUN TIME will be reset to 00:00:00.
Engine Speed: The scan tool range is 0-9999 RPM. Engine speed is computed by the powertrain control module (PCM) from the 3X reference input. It should remain close to desired idle under various engine loads with engine idling
EVAP Fault History: The scan tool displays No Fault, Excess Vacuum, Purge Valve Leak, Small Leak, or Weak Vacuum.
EVAP Purge Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the evaporative emission (EVAP) purge solenoid circuit. The scan tool displays Fault, OK, or Invalid State.
EVAP Purge Solenoid Command: The scan tool range is 0-100 percent. Represents the powertrain control module (PCM) commanded pulse width modulation (PWM) duty cycle of the evaporative emission (EVAP) purge valve. 0 percent displayed indicates no purge. 100 percent displayed indicates full purge.
EVAP Test Abort Reason: Indicates the reason that the evaporative emission (EVAP) test was aborted. The scan tool displays Excess Vacuum, Purge Valve Leak, Small Leak, or Weak Vacuum.
EVAP Test Result: The scan tool displays No Results, Passed, Aborted, Fail DTC P0440, Fail DTC P0442, Fail DTC P0446, Fail DTC P1441. This information can be used to check system operation. This parameter displays the results of the evaporative emission (EVAP) system diagnostic tests.
EVAP Test State: The scan tool displays Test Completed, Test Running, Wait for Purge . Indicates the current status of the evaporative emission (EVAP) diagnostic routine.
EVAP Vent Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the evaporative emission (EVAP) vent solenoid circuit. The scan tool displays Fault, OK, or Invalid State.
EVAP Vent Solenoid Command: The scan tool displays venting/not venting. Indicates the commanded state of the EVAP vent solenoid.
FC Relay 1 Circuit Status: Indicates the diagnostic state of the output driver for the FC relay 1 circuit. The scan tool displays Fault, OK, or Invalid State.
FC Relay 1 Command: Indicates the commanded state of the FC relay 1. The scan tool displays ON or OFF.
FC Relay 2 and 3 Circuit Status: Indicates the diagnostic state of the output driver for the FC relay 2 and 3 circuit. The scan tool displays Fault, OK, or Invalid State.
FC Relay 2 and 3 Command: Indicates the commanded state of the FC relay 2 and 3. The scan tool displays ON or OFF.
Fuel Pump Relay Circuit History Status: Indicates the stored diagnostic state of the driver circuit for this device. The scan tool displays Fault or OK.
Fuel Pump Relay Circuit Status: Indicates the diagnostic state of the output driver for the fuel pump relay control circuit. The scan tool displays Fault, OK, or Invalid State.
Fuel Pump Relay Command: The scan tool displays ON or OFF. Indicates the powertrain control module (PCM) commanded state of the fuel pump relay control circuit.
Fuel Tank Level Remaining: Indicates the level of fuel remaining in the fuel tank. The scan tool displays percent.
Fuel Tank Pressure Sensor: Indicates fuel tank pressure. The scan tool displays mm Hg or in H2O.
Fuel Tank Pressure Sensor: The scan tool displays 0-5 volts or -17.5 to +7.5 in of H2O. Fuel tank pressure is used extensively for evaporative emission (EVAP) purge control and EVAP system diagnostics.
Fuel Trim Cell: The scan tool range is 0-9 fuel trim cell is dependent upon engine speed and mass air flow (MAF) sensor readings. A plot of RPM vs. MAF is divided into 10 cells. Fuel trim cell indicates which cell is currently active.
Fuel Trim Learn: The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim (FT) corrections, FUEL TRIM LEARN will display Enabled. This indicates that the long term FT is responding to short term fuel trim. If the fuel trim learn displays Disabled, long term FT will not respond to changes in short term FT.
Gen L-Terminal Signal Command: The scan tool displays ON or OFF. OFF displayed indicates that the powertrain control module (PCM) has commanded the generator control circuit OFF.
HO2S 1: The scan tool range is 0-1,132 mV. Represents the fuel control exhaust oxygen sensor output voltage. Should fluctuate constantly within a range between 10 mV, lean exhaust and 1,000 mV, rich exhaust, while operating in Closed Loop.
HO2S 2: The scan tool range is 0-1,132 mV. Represents the catalyst monitor exhaust oxygen sensor output voltage. If the catalyst is operating efficiently, the heated oxygen sensor (HO2S) 1 signal will be far more active than that produced by the heated oxygen sensor (HO2S) 2. If the powertrain control module (PCM) detects a level of HO2S 2 activity that indicates the catalyst is no longer operating efficiently, DTC P0420 will be set.
IAC Position: The scan tool range is 0-255. Displays the commanded position of the idle air control pintle in counts. A larger number of counts means that more air is being commanded through the idle air passage. Idle air control (IAC) position should respond fairly quickly to changes in engine load to maintain desired idle RPM.
IAT Sensor: The scan tool range is -40°C to +151°C (-40°F to +304°F). The powertrain control module (PCM) converts the resistance of the intake air temperature sensor to degrees. The PCM uses intake air temperature (IAT) to adjust fuel delivery and spark timing according to incoming air density. IAT is also compared to ECT at startup to identify cold starts for the heated oxygen sensor (HO2S) heater and the evaporative emission (EVAP) diagnostics.
Ignition 1 Signal: The scan tool range is 0-25.5 volts. Represents the system voltage measured by the powertrain control module (PCM) at its ignition feed.
Ignition Mode: The scan tool displays BYPASS or IC. Indicates the commanded state of the bypass signal output from the powertrain control module (PCM). When BYPASS is displayed, the ignition control module is controlling the spark advance at a fixed 10° before top dead center (BTDC). IC displayed indicates that the PCM has requested control of the spark advance (IC mode). The ignition control module determines the correct operating mode based on the level of voltage that the PCM applies to the ignition control module bypass circuit. The PCM provides 5 volts to the ignition control module bypass circuit when conditions are appropriate for PCM control of spark timing (IC mode). If the PCM does not apply 5 volts to the bypass circuit, or if the ignition control module does not receive it, the module will control spark timing.
Injector PWM: Indicates the commanded pulse width modulation of the fuel injectors. The scan tool displays milliseconds.
Knock Retard: The scan tool range is 0-25.5 degrees. Indicates the amount of spark the powertrain control module (PCM) is removing from the IC spark advance in response to the signal from the knock sensors. The traction control system desired torque signal from the electronic brake/traction control module (electronic brake/traction control module (EBTCM) may cause knock retard to display a value more than 0 degrees if traction control is active.
Long Term FT: The scan tool range is -23 to +16 percent. Long term fuel trim (FT) is derived from the short term fuel trim (FT) value and represents a long-term correction of fuel delivery. A value of 0 percent indicates that fuel delivery requires no compensation to maintain the powertrain control module (PCM) commanded air/fuel ratio. A negative value significantly below 0 percent indicates that the fuel system is rich and fuel delivery is being reduced, decreased injector pulse width. A positive value significantly more than 0 percent indicates that a lean condition exists and the PCM is compensating by adding fuel, increased injector pulse width. Because long term fuel trim tends to follow short term FT, a value in the negative range due to canister purge at idle should not be considered unusual. The PCM's maximum authority to control long term FT allows a range between -23 percent and +16 percent. Fuel trim values at or near maximum authority may indicate an excessively rich or lean system.
Loop Status: The scan tool displays OPEN or CLOSED. Closed Loop indicates that the powertrain control module (PCM) is controlling fuel delivery according to oxygen sensor voltage. In Open Loop, the PCM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on throttle position (TP) sensor, engine coolant, and mass air flow (MAF) sensor inputs only.
MAF Sensor: The scan tool range is 0-512 g/s. Mass air flow (MAF) is the MAF input frequency converted to grams of air per second. This indicates the amount of air entering the engine.
MAF Sensor: The scan tool range is 0-32,000 Hz. The mass air flow (MAF) sensor input signal to the powertrain control module (PCM) is a frequency which varies from around 3,000 Hz at idle to above 7,000 Hz at wide-open throttle. The PCM converts this frequency signal to grams per second to be displayed on the scan tool as MAF.
MAP Sensor: The scan tool range is 10-105 kPa/0-4.97 volts. The manifold absolute pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, exhaust gas recirculation (EGR) flow, and speed changes. As intake manifold pressure increases, intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading. The MAP sensor signal is used to monitor intake manifold pressure changes during the EGR flow test, to update the barometric (BARO) reading, and as an enabling factor for many of the diagnostics.
MIL Command: The scan tool displays ON or OFF. Indicates the powertrain control module (PCM) commanded state of the malfunction indicator lamp (MIL).
MIL Circuit Status: Indicates the diagnostic state of the output driver for the malfunction indicator lamp (MIL) circuit. The scan tool displays Fault, OK, or Invalid State.
Misfire Current Cyl. 1-6: The scan tool range is 0-198 counts. The misfire current counters indicate the number of cylinder firing events detected as possible misfires on each cylinder during the last 200 crankshaft revolutions. The number that the counters display are twice the actual number of misfire events detected. The counters may normally display some activity, but the activity should be very low and nearly equal for all the cylinders.
Misfire History Cyl. 1-6: The scan tool range is 0-65535 counts. The misfire history counters indicate the total level of misfire that has been detected on each cylinder. The number that the counters display are twice the actual number of misfire events detected. The misfire history counters will not update or show any activity until a misfire DTC P0300 has become active. The misfire history counters will be updated every time a 200 crankshaft revolution misfire test failure is detected.
Number of DTC(s): The scan tool displays a number. This parameter displays the quantity of active DTCs.
PCM/VCM in VTD Fail Enable: The scan tool displays YES or NO. If applicable. The theft deterrent fuel enable is an input from the vehicle theft deterrent system that signals the powertrain control module (PCM) to enable the injectors and the crank relay if the proper signal is received. The scan tool will normally display NO. If the vehicle theft deterrent system does not send the correct theft deterrent fuel enable signal to the PCM, the display will switch to YES and the fuel system and starter control may be disabled. Refer to vehicle theft deterrent diagnosis for further information.
Power Enrichment: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the powertrain control module (PCM) has detected conditions appropriate to operate in Power Enrichment mode. The PCM will command Power Enrichment mode when a large increase in throttle position and load is detected. While in Power Enrichment, the PCM will increase the amount of fuel delivered by entering Open Loop and increasing the injector pulse width. This is done to prevent a possible sag or hesitation from occurring during acceleration.
Short Term FT: The scan tool range is -11 to +20 percent. Short term fuel trim (FT) represents a short-term correction to fuel delivery by the powertrain control module (PCM) in response to the amount of time the fuel control oxygen sensor voltage spends above or below the 450 mV threshold. If the oxygen sensor voltage has mainly remained less than 450 mV, indicating a lean air/fuel mixture, short term FT will increase into the positive range above 0 percent and the PCM will add fuel. If the oxygen sensor voltage stays mainly above the threshold, short term fuel trim will decrease below 0 percent into the negative range while the PCM reduces fuel delivery to compensate for the indicated rich condition. Under certain conditions such as extended idle and high ambient temperatures, canister purge may cause short term FT to read in the negative range during normal operation. The PCM's maximum authority to control fuel trim allows a range between -11 and +20 percent. Fuel trim values at maximum authority may indicate an excessively rich or lean system.
Spark: The scan tool range is -64 to +64 degrees. Displays the spark timing being commanded by the powertrain control module (PCM) on the IC circuit. A negative (-) value indicates degrees before top dead center (BTDC) or spark advance. A positive value indicates degrees after top dead center (ATDC) or spark retard. Because the ignition control module sets spark advance at a fixed value of 10 degrees BTDC while operating in bypass mode, the displayed spark advance only reflects true spark timing when the PCM has commanded IC mode.
Starter Enable Relay Circuit Status: Indicates the diagnostic state of the output driver for the starter enable relay control circuit. The scan tool displays Fault, OK, or Invalid State.
Starter Relay Command: The scan tool displays ON or OFF. A disabled display indicates that the powertrain control module (PCM) has inhibited starter relay operation. The PCM will inhibit starter relay operation if the engine is running, a correct vehicle theft deterrent (VTD) password has not been received from the VTD module or if the starter is engaged for an extended period of time.
Start-Up ECT: The scan tool range is -40°C to +151°C (-40°F to +304°F). Indicates the engine coolant temperature at the time that the vehicle was started. Used by the heated oxygen sensor (HO2S) diagnostic to determine if the last startup was a cold start.
Start-Up IAT: The scan tool range is -40°C to +151°C (-40°F to +304°F). Indicates the intake air temperature at the time that the vehicle was started. Used by the heated oxygen sensor (HO2S) diagnostic to determine if the last startup was a cold start.
TCC Brake Pedal Switch: Indicates the state of the switch. The scan tool displays Applied or Released.
TCC PWM Solenoid Command: Indicates the commanded pulse width modulation (PWM) signal to the solenoid. The scan tool displays Hz.
TCS Circuit Status: Indicates the diagnostic state of the output driver for the TCS circuit. The scan tool displays ON or OFF.
TCS Circuit History: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.
TFP Switch: The scan tool displays PARK/NEUTRAL, REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. The transmission fluid temperature (TFP) switch represents the decoded status of the four inputs from the internal transaxle fluid pressure switch assembly. The combination of these inputs indicates the position of the transaxle manual valve.
TP Sensor: The scan tool range is 0-100 percent. throttle position (TP) angle is computed by the powertrain control module (PCM) from the throttle position (TP) sensor voltage. TP angle should display 0 percent at idle and 100 percent at wide open throttle.
TP Sensor: The scan tool range is 0-5 volts. The voltage being monitored by the powertrain control module (PCM) on the throttle position (TP) sensor signal circuit.
Traction Control Status (If Equipped): The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the traction control system is taking action to reduce drive wheel slippage.
Torque Delivered Signal (If Equipped): The scan tool range is 0-100 percent. Represents the pulse width modulation (PWM) signal which indicates the percent of available torque the engine is delivering to the drive wheels. The electronic brake/traction control module (electronic brake/traction control module (EBTCM) monitors the traction control torque signal to ensure that the powertrain control module (PCM) is responding properly to the traction control desired torque signal.
Torque Request Signal (If Equipped): The scan tool range is 0-100 percent. Represents the pulse width modulation (PWM) signal from the Electronic brake/traction control module (EBTCM). The electronic brake/traction control module (electronic brake/traction control module (EBTCM) reduces the traction control desired torque signal pulse width when a drive wheel slippage situation is detected. The powertrain control module (PCM) monitors the traction control desired torque signal and reduces drive wheel slippage as necessary by retarding spark timing, decreasing boost solenoid PWM, or increasing air/fuel ratio. The PCM can also turn OFF up to three fuel injectors if the traction control desired torque signal indicates a large enough amount of drive wheel slippage. A problem with the traction control desired torque signal should cause DTC P1571 to set.
Vehicle Speed Sensor: The scan tool range is 0-255 km/h (0-155 mph). The vehicle speed sensor signal is converted into mph and km/h for display.
VTD Auto. Learn Timer: The scan tool displays ACTIVE or INACTIVE. The auto learn timer is the indication if the vehicle theft deterrent (VTD) system is in the learn mode and has not timed out.
VTD Fuel Disable: The scan tool displays ACTIVE or INACTIVE. If applicable. The theft deterrent fuel enable is an input from the vehicle theft deterrent system that signals the powertrain control module (PCM) to enable the injectors and the crank relay if the proper signal is received. The scan tool will normally display INACTIVE. If the vehicle theft deterrent system does not send the correct theft deterrent fuel enable signal to the PCM, the display will switch to ACTIVE and the fuel system and starter control may be disabled. Refer to vehicle theft deterrent diagnosis for further information.
VTD Fuel Disable Until Ign. OFF: The scan tool displays YES or NO. With the ignition ON and a vehicle theft deterrent (VTD) code present, the scan tool displays YES.
18X Crank Sensor: Indicates engine RPM based on the 18X reference signal input to the powertrain control module (PCM).
1-2 Solenoid Circuit Status: Indicates the diagnostic state of the 1-2 solenoid control circuit. The scan tool displays Fault, OK, or Invalid State.
2-3 Solenoid Circuit Status: Indicates the diagnostic state of the 2-3 solenoid control circuit. The scan tool displays Fault, OK, or Invalid State.
A/C High Side Pressure Sensor: The scan tool displays 0-5 volts. Represents the A/C refrigerant pressure sensor signal. The amount of pressure indicates the amount of load that the A/C compressor is placing on the engine. The powertrain control module (PCM) uses this information in order to adjust idle and to control the cooling fans.
A/C Off For WOT: The scan tool displays YES or NO. Indicates whether A/C is commanded OFF due to wide open throttle.
A/C Pressure Disable: The scan tool displays YES or NO. Indicates whether A/C is commanded OFF due to excessive or insufficient pressure.
A/C Relay Circuit Status: The scan tool displays OK, Fault, or Invalid State. Indicates the diagnostic state of the A/C relay control circuit.
A/C Relay Command: The scan tool displays ON or OFF. Indicates intended powertrain control module (PCM) output to the A/C relay.
Air Fuel Ratio: The scan tool range is 0-25.5. Air fuel ratio indicates the powertrain control module (PCM) commanded value. In Closed Loop, air fuel ratio should normally be around 14.2-14.7. A lower air fuel ratio indicates a richer commanded mixture, which may be seen during power enrichment or three-way catalyst (TWC) protection modes. A higher air fuel ratio indicates a leaner commanded mixture. This can be seen during decel fuel mode.
AIR Pump Relay Circuit Status: Indicates the diagnostic state of the output driver for the secondary air injection (AIR) pump relay control circuit. The scan tool displays Fault, OK, or Invalid State.
AIR Pump Relay Command: Indicates the commanded state of the secondary air injection (AIR) pump relay. The scan tool displays ON or OFF.
AIR Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the secondary air injection (AIR) solenoid control circuit. The scan tool displays Fault, OK, or Invalid State.
AIR Solenoid Command: Indicates the commanded state of the secondary air injection (AIR) solenoid. The scan tool displays ON or OFF.
BARO: The scan tool range is 10-105 kPa/0-5 volts. The barometric pressure reading is determined from the manifold absolute pressure (MAP) sensor signal monitored during key up and wide open throttle (WOT) conditions. Barometric pressure is used to adjust fuel delivery and spark advance to compensate for altitude changes.
CMP Sensor Signal Present: Indicates if the powertrain control module (PCM) is receiving the cam sensor reference signal from the ignition control module. The scan tool displays YES or NO.
Cruise Control Active: The scan tool displays YES or NO. Represents the state of the Cruise Status Input form the SMCC module. Cruise should not display YES unless the vehicle is operating in cruise control.
Cruise Inhibit Reason: Scan tool displays VEHICLE SPEED, BRAKE, or CLUTCH. Indicated the reason cruise is being inhibited.
Cruise Inhibit Signal Circuit Status: Indicates the diagnostic state of the output driver for the cruise inhibit signal circuit. The scan tool displays Fault, OK, or Invalid State.
Cruise Inhibit Signal Command: Indicates if cruise is being inhibited. The scan tool displays ON or OFF.
Current Gear: The scan tool displays numbers 1, 2, 3, or 4. The powertrain control module (PCM) looks at trans range position and the gear commanded by the PCM. The actual forward gear that the transaxle is in will be the lower of the two because the manual valve can override the PCM commanded gear.
Cycles of Misfire Data: The scan tool range is 0-99 counts. Indicates the total number of cylinder firing events that were detected as being misfires during the last 200 crankshaft revolution sample period.
Cyl. 1-6 Injector Circuit History: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.
Cyl. 1-6 Injector Circuit Status: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.
Decel Fuel Cutoff: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the powertrain control module (PCM) has detected conditions appropriate to operate in deceleration fuel mode. The PCM will command deceleration fuel mode when a sudden decrease in throttle position has been detected while the vehicle is traveling over 40 km/h (25 mph). While in deceleration fuel mode, the PCM will decrease the amount of fuel delivered by entering Open Loop and decreasing the injector pulse width.
Desired EGR Position: The scan tool displays volts or a range from 0-100 percent. Represents the exhaust gas recirculation (EGR) pintle position that the powertrain control module (PCM) is commanding. The desired EGR position should stay close to the EGR position sensor.
Desired Idle Speed: The scan tool range is 0-3187 RPM. Represents the idle speed that is commanded by the powertrain control module (PCM). The PCM will compensate for various engine loads based on engine coolant temperature to keep the engine at the desired idle speed.
Driver Module 1 Status: Indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 2 Status: Indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 3 Status: Indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
Driver Module 4 Status: Driver Module 4 Status indicates the diagnostic state of the module. The scan tool displays Enabled, Off-High Volts, Off-High Temp, or Invalid State.
ECT Sensor: The scan tool range is -40°C to +151°C (-40°F to +304°F). The engine coolant temperature (ECT) sensor is mounted in the coolant stream. The powertrain control module (PCM) applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold, internal resistance high, the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
EGR Flow Test Count: The scan tool range is 0-255. Indicates the number of exhaust gas recirculation (EGR) flow test samples collected during the current ignition cycle. The maximum number of samples allowed is 1 during normal operation. If the powertrain control module (PCM) battery feed has been disconnected or a DTC P0401 has been cleared, several EGR flow test samples will be allowed during the next ignition cycle. This is to allow repair verification during a single ignition cycle.
EGR Learned Minimum Position: The scan tool range is 0-5 volts. Represents the learned voltage that the powertrain control module (PCM) uses to determine whether or not the exhaust gas recirculation (EGR) valve is fully closed, 0 percent pintle position. If the desired EGR position is 0 percent and a difference of more than 0.4 volt between EGR feedback and EGR closed valve pintle position is detected, DTC P1406 will set.
EGR Position Sensor: The scan tool range is 0-100 percent. Represents the actual position of the exhaust gas recirculation (EGR) pintle in percent. 0 percent displayed indicates a fully extended pintle, EGR valve closed.
EGR Position Sensor: The scan tool range is 0-5 volts. Indicates the exhaust gas recirculation (EGR) pintle position sensor signal voltage being monitored by the powertrain control module (PCM). A low voltage indicates a fully extended pintle, closed valve. A voltage near 5 volts indicates a fully retracted pintle, open valve.
EGR Position Variance: The scan tool range is 0-100 percent. Indicates the difference between Desired exhaust gas recirculation (EGR) Position and Actual EGR Position currently being monitored by the powertrain control module (PCM). If the EGR Position Variance reaches an unacceptable level, DTC P1406 will set.
EGR Solenoid Circuit History: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.
EGR Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the exhaust gas recirculation (EGR) solenoid circuit. The scan tool displays Fault, OK, or Invalid State.
EGR Solenoid Command: The scan tool range is 0-100 percent. Represents the exhaust gas recirculation (EGR) valve driver pulse width modulation (PWM) signal from the powertrain control module (PCM). A duty cycle of 0 percent indicates that no EGR flow is being commanded. A 100 percent duty cycle indicates maximum EGR flow commanded.
Engine Load: The scan tool range is 0-100 percent. Engine load is calculated by the powertrain control module (PCM) from engine speed and mass air flow (MAF) sensor readings. Engine load should increase with an increase in RPM or air flow.
Engine Oil Level Switch: The scan tool displays OK or LOW. Indicates the oil level as determined by the engine oil level switch.
Engine Oil Life Remaining: The scan tool range is 0-100 percent. Indicates the engine oil life index. The powertrain control module (PCM) calculates engine oil life based upon the number of engine revolutions seen and operating conditions such as calculated oil temperature. Pressing the oil life monitor reset switch will return the displayed engine oil life to 100 percent.
Engine Oil Pressure Switch: The scan tool displays OK or Low. Indicates if the engine oil pressure is above or below the minimum desired value.
Engine Run Time: The scan tool range is 00:00:00-99:99:99 Hrs:Min:Sec. Indicates the time elapsed since the engine was started. If the engine is stopped, ENGINE RUN TIME will be reset to 00:00:00.
Engine Speed: The scan tool range is 0-9999 RPM. Engine speed is computed by the powertrain control module (PCM) from the 3X reference input. It should remain close to desired idle under various engine loads with engine idling
EVAP Fault History: The scan tool displays No Fault, Excess Vacuum, Purge Valve Leak, Small Leak, or Weak Vacuum.
EVAP Purge Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the evaporative emission (EVAP) purge solenoid circuit. The scan tool displays Fault, OK, or Invalid State.
EVAP Purge Solenoid Command: The scan tool range is 0-100 percent. Represents the powertrain control module (PCM) commanded pulse width modulation (PWM) duty cycle of the evaporative emission (EVAP) purge valve. 0 percent displayed indicates no purge. 100 percent displayed indicates full purge.
EVAP Test Abort Reason: Indicates the reason that the evaporative emission (EVAP) test was aborted. The scan tool displays Excess Vacuum, Purge Valve Leak, Small Leak, or Weak Vacuum.
EVAP Test Result: The scan tool displays No Results, Passed, Aborted, Fail DTC P0440, Fail DTC P0442, Fail DTC P0446, Fail DTC P1441. This information can be used to check system operation. This parameter displays the results of the evaporative emission (EVAP) system diagnostic tests.
EVAP Test State: The scan tool displays Test Completed, Test Running, Wait for Purge . Indicates the current status of the evaporative emission (EVAP) diagnostic routine.
EVAP Vent Solenoid Circuit Status: Indicates the diagnostic state of the output driver for the evaporative emission (EVAP) vent solenoid circuit. The scan tool displays Fault, OK, or Invalid State.
EVAP Vent Solenoid Command: The scan tool displays venting/not venting. Indicates the commanded state of the EVAP vent solenoid.
FC Relay 1 Circuit Status: Indicates the diagnostic state of the output driver for the FC relay 1 circuit. The scan tool displays Fault, OK, or Invalid State.
FC Relay 1 Command: Indicates the commanded state of the FC relay 1. The scan tool displays ON or OFF.
FC Relay 2 and 3 Circuit Status: Indicates the diagnostic state of the output driver for the FC relay 2 and 3 circuit. The scan tool displays Fault, OK, or Invalid State.
FC Relay 2 and 3 Command: Indicates the commanded state of the FC relay 2 and 3. The scan tool displays ON or OFF.
Fuel Pump Relay Circuit History Status: Indicates the stored diagnostic state of the driver circuit for this device. The scan tool displays Fault or OK.
Fuel Pump Relay Circuit Status: Indicates the diagnostic state of the output driver for the fuel pump relay control circuit. The scan tool displays Fault, OK, or Invalid State.
Fuel Pump Relay Command: The scan tool displays ON or OFF. Indicates the powertrain control module (PCM) commanded state of the fuel pump relay control circuit.
Fuel Tank Level Remaining: Indicates the level of fuel remaining in the fuel tank. The scan tool displays percent.
Fuel Tank Pressure Sensor: Indicates fuel tank pressure. The scan tool displays mm Hg or in H2O.
Fuel Tank Pressure Sensor: The scan tool displays 0-5 volts or -17.5 to +7.5 in of H2O. Fuel tank pressure is used extensively for evaporative emission (EVAP) purge control and EVAP system diagnostics.
Fuel Trim Cell: The scan tool range is 0-9 fuel trim cell is dependent upon engine speed and mass air flow (MAF) sensor readings. A plot of RPM vs. MAF is divided into 10 cells. Fuel trim cell indicates which cell is currently active.
Fuel Trim Learn: The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim (FT) corrections, FUEL TRIM LEARN will display Enabled. This indicates that the long term FT is responding to short term fuel trim. If the fuel trim learn displays Disabled, long term FT will not respond to changes in short term FT.
Gen L-Terminal Signal Command: The scan tool displays ON or OFF. OFF displayed indicates that the powertrain control module (PCM) has commanded the generator control circuit OFF.
HO2S 1: The scan tool range is 0-1,132 mV. Represents the fuel control exhaust oxygen sensor output voltage. Should fluctuate constantly within a range between 10 mV, lean exhaust and 1,000 mV, rich exhaust, while operating in Closed Loop.
HO2S 2: The scan tool range is 0-1,132 mV. Represents the catalyst monitor exhaust oxygen sensor output voltage. If the catalyst is operating efficiently, the heated oxygen sensor (HO2S) 1 signal will be far more active than that produced by the heated oxygen sensor (HO2S) 2. If the powertrain control module (PCM) detects a level of HO2S 2 activity that indicates the catalyst is no longer operating efficiently, DTC P0420 will be set.
IAC Position: The scan tool range is 0-255. Displays the commanded position of the idle air control pintle in counts. A larger number of counts means that more air is being commanded through the idle air passage. Idle air control (IAC) position should respond fairly quickly to changes in engine load to maintain desired idle RPM.
IAT Sensor: The scan tool range is -40°C to +151°C (-40°F to +304°F). The powertrain control module (PCM) converts the resistance of the intake air temperature sensor to degrees. The PCM uses intake air temperature (IAT) to adjust fuel delivery and spark timing according to incoming air density. IAT is also compared to ECT at startup to identify cold starts for the heated oxygen sensor (HO2S) heater and the evaporative emission (EVAP) diagnostics.
Ignition 1 Signal: The scan tool range is 0-25.5 volts. Represents the system voltage measured by the powertrain control module (PCM) at its ignition feed.
Ignition Mode: The scan tool displays BYPASS or IC. Indicates the commanded state of the bypass signal output from the powertrain control module (PCM). When BYPASS is displayed, the ignition control module is controlling the spark advance at a fixed 10° before top dead center (BTDC). IC displayed indicates that the PCM has requested control of the spark advance (IC mode). The ignition control module determines the correct operating mode based on the level of voltage that the PCM applies to the ignition control module bypass circuit. The PCM provides 5 volts to the ignition control module bypass circuit when conditions are appropriate for PCM control of spark timing (IC mode). If the PCM does not apply 5 volts to the bypass circuit, or if the ignition control module does not receive it, the module will control spark timing.
Injector PWM: Indicates the commanded pulse width modulation of the fuel injectors. The scan tool displays milliseconds.
Knock Retard: The scan tool range is 0-25.5 degrees. Indicates the amount of spark the powertrain control module (PCM) is removing from the IC spark advance in response to the signal from the knock sensors. The traction control system desired torque signal from the electronic brake/traction control module (electronic brake/traction control module (EBTCM) may cause knock retard to display a value more than 0 degrees if traction control is active.
Long Term FT: The scan tool range is -23 to +16 percent. Long term fuel trim (FT) is derived from the short term fuel trim (FT) value and represents a long-term correction of fuel delivery. A value of 0 percent indicates that fuel delivery requires no compensation to maintain the powertrain control module (PCM) commanded air/fuel ratio. A negative value significantly below 0 percent indicates that the fuel system is rich and fuel delivery is being reduced, decreased injector pulse width. A positive value significantly more than 0 percent indicates that a lean condition exists and the PCM is compensating by adding fuel, increased injector pulse width. Because long term fuel trim tends to follow short term FT, a value in the negative range due to canister purge at idle should not be considered unusual. The PCM's maximum authority to control long term FT allows a range between -23 percent and +16 percent. Fuel trim values at or near maximum authority may indicate an excessively rich or lean system.
Loop Status: The scan tool displays OPEN or CLOSED. Closed Loop indicates that the powertrain control module (PCM) is controlling fuel delivery according to oxygen sensor voltage. In Open Loop, the PCM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on throttle position (TP) sensor, engine coolant, and mass air flow (MAF) sensor inputs only.
MAF Sensor: The scan tool range is 0-512 g/s. Mass air flow (MAF) is the MAF input frequency converted to grams of air per second. This indicates the amount of air entering the engine.
MAF Sensor: The scan tool range is 0-32,000 Hz. The mass air flow (MAF) sensor input signal to the powertrain control module (PCM) is a frequency which varies from around 3,000 Hz at idle to above 7,000 Hz at wide-open throttle. The PCM converts this frequency signal to grams per second to be displayed on the scan tool as MAF.
MAP Sensor: The scan tool range is 10-105 kPa/0-4.97 volts. The manifold absolute pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, exhaust gas recirculation (EGR) flow, and speed changes. As intake manifold pressure increases, intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading. The MAP sensor signal is used to monitor intake manifold pressure changes during the EGR flow test, to update the barometric (BARO) reading, and as an enabling factor for many of the diagnostics.
MIL Command: The scan tool displays ON or OFF. Indicates the powertrain control module (PCM) commanded state of the malfunction indicator lamp (MIL).
MIL Circuit Status: Indicates the diagnostic state of the output driver for the malfunction indicator lamp (MIL) circuit. The scan tool displays Fault, OK, or Invalid State.
Misfire Current Cyl. 1-6: The scan tool range is 0-198 counts. The misfire current counters indicate the number of cylinder firing events detected as possible misfires on each cylinder during the last 200 crankshaft revolutions. The number that the counters display are twice the actual number of misfire events detected. The counters may normally display some activity, but the activity should be very low and nearly equal for all the cylinders.
Misfire History Cyl. 1-6: The scan tool range is 0-65535 counts. The misfire history counters indicate the total level of misfire that has been detected on each cylinder. The number that the counters display are twice the actual number of misfire events detected. The misfire history counters will not update or show any activity until a misfire DTC P0300 has become active. The misfire history counters will be updated every time a 200 crankshaft revolution misfire test failure is detected.
Number of DTC(s): The scan tool displays a number. This parameter displays the quantity of active DTCs.
PCM/VCM in VTD Fail Enable: The scan tool displays YES or NO. If applicable. The theft deterrent fuel enable is an input from the vehicle theft deterrent system that signals the powertrain control module (PCM) to enable the injectors and the crank relay if the proper signal is received. The scan tool will normally display NO. If the vehicle theft deterrent system does not send the correct theft deterrent fuel enable signal to the PCM, the display will switch to YES and the fuel system and starter control may be disabled. Refer to vehicle theft deterrent diagnosis for further information.
Power Enrichment: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the powertrain control module (PCM) has detected conditions appropriate to operate in Power Enrichment mode. The PCM will command Power Enrichment mode when a large increase in throttle position and load is detected. While in Power Enrichment, the PCM will increase the amount of fuel delivered by entering Open Loop and increasing the injector pulse width. This is done to prevent a possible sag or hesitation from occurring during acceleration.
Short Term FT: The scan tool range is -11 to +20 percent. Short term fuel trim (FT) represents a short-term correction to fuel delivery by the powertrain control module (PCM) in response to the amount of time the fuel control oxygen sensor voltage spends above or below the 450 mV threshold. If the oxygen sensor voltage has mainly remained less than 450 mV, indicating a lean air/fuel mixture, short term FT will increase into the positive range above 0 percent and the PCM will add fuel. If the oxygen sensor voltage stays mainly above the threshold, short term fuel trim will decrease below 0 percent into the negative range while the PCM reduces fuel delivery to compensate for the indicated rich condition. Under certain conditions such as extended idle and high ambient temperatures, canister purge may cause short term FT to read in the negative range during normal operation. The PCM's maximum authority to control fuel trim allows a range between -11 and +20 percent. Fuel trim values at maximum authority may indicate an excessively rich or lean system.
Spark: The scan tool range is -64 to +64 degrees. Displays the spark timing being commanded by the powertrain control module (PCM) on the IC circuit. A negative (-) value indicates degrees before top dead center (BTDC) or spark advance. A positive value indicates degrees after top dead center (ATDC) or spark retard. Because the ignition control module sets spark advance at a fixed value of 10 degrees BTDC while operating in bypass mode, the displayed spark advance only reflects true spark timing when the PCM has commanded IC mode.
Starter Enable Relay Circuit Status: Indicates the diagnostic state of the output driver for the starter enable relay control circuit. The scan tool displays Fault, OK, or Invalid State.
Starter Relay Command: The scan tool displays ON or OFF. A disabled display indicates that the powertrain control module (PCM) has inhibited starter relay operation. The PCM will inhibit starter relay operation if the engine is running, a correct vehicle theft deterrent (VTD) password has not been received from the VTD module or if the starter is engaged for an extended period of time.
Start-Up ECT: The scan tool range is -40°C to +151°C (-40°F to +304°F). Indicates the engine coolant temperature at the time that the vehicle was started. Used by the heated oxygen sensor (HO2S) diagnostic to determine if the last startup was a cold start.
Start-Up IAT: The scan tool range is -40°C to +151°C (-40°F to +304°F). Indicates the intake air temperature at the time that the vehicle was started. Used by the heated oxygen sensor (HO2S) diagnostic to determine if the last startup was a cold start.
TCC Brake Pedal Switch: Indicates the state of the switch. The scan tool displays Applied or Released.
TCC PWM Solenoid Command: Indicates the commanded pulse width modulation (PWM) signal to the solenoid. The scan tool displays Hz.
TCS Circuit Status: Indicates the diagnostic state of the output driver for the TCS circuit. The scan tool displays ON or OFF.
TCS Circuit History: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.
TFP Switch: The scan tool displays PARK/NEUTRAL, REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. The transmission fluid temperature (TFP) switch represents the decoded status of the four inputs from the internal transaxle fluid pressure switch assembly. The combination of these inputs indicates the position of the transaxle manual valve.
TP Sensor: The scan tool range is 0-100 percent. throttle position (TP) angle is computed by the powertrain control module (PCM) from the throttle position (TP) sensor voltage. TP angle should display 0 percent at idle and 100 percent at wide open throttle.
TP Sensor: The scan tool range is 0-5 volts. The voltage being monitored by the powertrain control module (PCM) on the throttle position (TP) sensor signal circuit.
Traction Control Status (If Equipped): The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the traction control system is taking action to reduce drive wheel slippage.
Torque Delivered Signal (If Equipped): The scan tool range is 0-100 percent. Represents the pulse width modulation (PWM) signal which indicates the percent of available torque the engine is delivering to the drive wheels. The electronic brake/traction control module (electronic brake/traction control module (EBTCM) monitors the traction control torque signal to ensure that the powertrain control module (PCM) is responding properly to the traction control desired torque signal.
Torque Request Signal (If Equipped): The scan tool range is 0-100 percent. Represents the pulse width modulation (PWM) signal from the Electronic brake/traction control module (EBTCM). The electronic brake/traction control module (electronic brake/traction control module (EBTCM) reduces the traction control desired torque signal pulse width when a drive wheel slippage situation is detected. The powertrain control module (PCM) monitors the traction control desired torque signal and reduces drive wheel slippage as necessary by retarding spark timing, decreasing boost solenoid PWM, or increasing air/fuel ratio. The PCM can also turn OFF up to three fuel injectors if the traction control desired torque signal indicates a large enough amount of drive wheel slippage. A problem with the traction control desired torque signal should cause DTC P1571 to set.
Vehicle Speed Sensor: The scan tool range is 0-255 km/h (0-155 mph). The vehicle speed sensor signal is converted into mph and km/h for display.
VTD Auto. Learn Timer: The scan tool displays ACTIVE or INACTIVE. The auto learn timer is the indication if the vehicle theft deterrent (VTD) system is in the learn mode and has not timed out.
VTD Fuel Disable: The scan tool displays ACTIVE or INACTIVE. If applicable. The theft deterrent fuel enable is an input from the vehicle theft deterrent system that signals the powertrain control module (PCM) to enable the injectors and the crank relay if the proper signal is received. The scan tool will normally display INACTIVE. If the vehicle theft deterrent system does not send the correct theft deterrent fuel enable signal to the PCM, the display will switch to ACTIVE and the fuel system and starter control may be disabled. Refer to vehicle theft deterrent diagnosis for further information.
VTD Fuel Disable Until Ign. OFF: The scan tool displays YES or NO. With the ignition ON and a vehicle theft deterrent (VTD) code present, the scan tool displays YES.
