The Scan Tool Data Definitions contain a brief description of all engine related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter appears more than once or in more than one data list in order to group certain related parameters together.

3X Crank Sensor: The scan tool displays 1,200-10,000 RPM. This signal is calculated from the 18X pulses and is fed to the powertrain control module (PCM) by the ignition control module (ICM). This is used by the PCM to calculate RPM at engine speeds above 1,200 RPM and to initiates injector pulses.

18X Crank Sensor: The scan tool displays 0-1,200 RPM. This signal is produced by the ignition control module (ICM) and is fed to the powertrain control module (PCM) to calculate engine RPM below 1,200 RPM.

1-2 Solenoid: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

2-3 Solenoid: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

A/C High Side Pressure Sensor: The scan tool displays 0.00-5.00 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 to adjust idle and to control the cooling fans.

A/C OFF for WOT: A/C OFF for wide open throttle (WOT) indicated if A/C operation has been disabled due to a WOT condition. The scan tool displays YES or NO.

A/C Pressure Disable: The scan tool displays YES or NO. YES displayed indicated that the powertrain control module (PCM) is monitoring an A/C refrigerant pressure signal voltage which is too high or too low to allow the A/C compressor clutch to engage.

A/C Relay Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

A/C Relay Command: A/C Relay Command indicates the commanded state of the A/C relay control circuit. The scan tool displays On or Off.

A/C Request Signal: The scan tool displays YES or NO. Indicates the state of the A/C request input circuit from the heating, ventilation, and air conditioning (HVAC) controls. The powertrain control module (PCM) uses the A/C request signal to determine whether A/C compressor operation is being requested.

Air/Fuel Ratio: The scan tool displays 0.0-25.5. The 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 converter (TWC) protection modes. A higher air/fuel ratio indicates a leaner commanded mixture. This can be seen during Decel Fuel Mode.

APP Average: The scan tool displays 0-150 counts. If the accelerator pedal is fully depressed the scan tool will display approximately 122 counts. The throttle actuator control (TAC) module takes the voltages from the 3 accelerator pedal position (APP) sensors, averages the readings and converts the readings into counts. The scan tool displays the average. The average is different on every vehicle.

APP Indicated Angle: The scan tool displays 0-100 percent. The scan tool displays the accelerator pedal position (APP) in percentage. If the APP is at rest, the display shows 0 percent. If the APP is fully depressed, the display shows 100 percent.

APP Sensor 1/ 2/3: The scan tool displays 0-5.0 volts. If the accelerator pedal is at 0 percent, or the pedal is at rest, the display shows approximately 1 volt. If the accelerator pedal is at 100 percent, or the pedal is fully depressed, the display shows approximately 3.6 volts.

APP Sensor 1/ 2/3: The scan tool displays 0-100 percent. If the accelerator pedal is at rest, display shows 0 percent. If the accelerator pedal is fully depressed, display shows 100 percent. This percentage indicates to the throttle actuator control (TAC) module the actual pedal position.

APP Sensor 1 and APP Sensor 2 Disagree: The scan tool displays Agree or Disagree. If the throttle actuator control (TAC) module receives a signal voltage from accelerator pedal position (APP) sensor 1 which is not in proper relationship to APP sensor 2, the scan tool displays Disagree. The scan tool displays Agree under the normal operating conditions.

APP Sensor 1 and APP Sensor 3 Disagree: The scan tool displays Agree or Disagree. If the throttle actuator control (TAC) module receives a signal voltage from accelerator pedal position (APP) sensor 1 not in proper relationship to APP sensor 3, the scan tool displays Disagree. The scan tool displays Agree under the normal operating conditions.

APP Sensor 2 and APP Sensor 3 Disagree: The scan tool displays Agree or Disagree. If the throttle actuator control (TAC) module receives a signal voltage from accelerator pedal position (APP) sensor 2 not in proper relationship to APP sensor 3, the scan tool displays Disagree. The scan tool displays Agree under the normal operating conditions.

BARO: The scan tool displays 10-105 kPa (0-5 volts). The barometric pressure (BARO) reading is determined from the manifold absolute pressure (MAP) sensor signal monitored during key up and wide-open throttle (WOT) conditions. The BARO is used in order to adjust the fuel delivery, and to spark advance in order to compensate for altitude changes.

Clutch Pedal Switch: The scan tool displays APPLIED or RELEASED. The powertrain control module (PCM) monitors the clutch pedal switch input. If a low voltage is monitored, the PCM considers the clutch anticipate switch closed to ground, when the clutch pedal released. This is done to avoid a possible RPM flare caused by the sudden change in engine load.

CMP Sensor Signal Present: The scan tool displays YES or NO. If the powertrain control module (PCM) does not receive a cam signal from the ignition control module the scan tool displays NO.

Cruise Control Active: The scan tool displays ENGAGED or DISENGAGED. This represents the state of the Cruise Status Input from the powertrain control module (PCM) module. The cruise should not display ENGAGED unless the vehicle is operating in cruise control.

Cruise Disengage 1-6 History: The scan tool displays the last 6 cruise control disengages in order from 1-6. There are 30 possible causes for the cruise control to disengage.

Cruise On/Off Switch: The scan tool displays ON or OFF. If you activate the cruise control switch, the scan tool displays ON. The switch, when in the ON position, sends a signal voltage to the throttle actuator control (TAC) module, that signal is then sent to the powertrain control module (PCM) across serial data. This allows all other functions of the cruise control. If you turn OFF the cruise control switch, the scan tool displays OFF.

Cruise Release Brake Pedal Switch: The scan tool displays RELEASED or APPLIED. This circuit has the cruise brake switch and the cruise clutch switch wired in series on manual transmission vehicles. This represents the position of the brake pedal and clutch as seen by the powertrain control module (PCM). If the brake or clutch pedal is applied the PCM will not allow the cruise to engage. If a fault occurs on this circuit known as the cruise control brake switch Circuit, DTC P0571 will set and cruise will not function.

Cruise Resume/Accel: The scan tool displays ON or OFF. If the cruise control switch is in the ON position and the Resume/Accel switch is activated, the scan tool displays ON. The switch, when in the ON position, sends a signal voltage to the throttle actuator control (TAC) module, that signal is then sent to the powertrain control module (PCM) across serial data. If the Resume/Accel switch is released the scan tool displays OFF.

Cruise Set/Coast: The scan tool displays ON or OFF. If the cruise control switch is in the ON position and the Set/Coast switch is activated, the scan tool displays ON. The switch, when in the ON position, sends a signal voltage to the throttle actuator control (TAC) module, that signal is then sent to the powertrain control module (PCM) across serial data. If the Set/Coast switch is released the scan tool displays OFF.

Current Gear: The scan tool displays 0-4. The scan tool display the gear that the transmission is in. An illegal transmission position displays 9.

Cycles of Misfire Data: Scan Tool Range  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: Scan Tool Displays--Fault or OK. This parameter saves the state of the driver circuit for this device.

Cyl. 1-6 Injector Circuit Status: 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 is displayed if 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 (TP) 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 by decreasing the injector pulse width.

Desired EGR Position: The scan tool displays 0-100 percent. This represents the exhaust gas recirculation (EGR) pintle position that the powertrain control module (PCM) is commanding. Desired EGR position should stay close to actual EGR position.

Desired EGR Position: The scan tool displays 0-5 volts. This represents the exhaust gas recirculation (EGR) pintle position that the powertrain control module (PCM) is commanding. Desired EGR position should stay close to actual EGR position.

Desired Idle Speed: The scan tool displays 0-3187 RPM. This 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 (ECT) to keep the engine at the desired idle speed.

Driver Module 1/2/3/4 Status: The scan tool displays Enabled, Off-High volts, Off-High Temp or Invalid state. This parameter describes the internal powertrain control module (PCM) driver module condition. This module controls all the relays/solenoids listed below the Driver Module parameter in the scan tool Output Driver Data List up to the next driver module.

ECT Sensor: The scan tool displays -40 to +151°C (-40 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. If the sensors internal resistance is high, the PCM monitors the signal voltage, and interprets the high voltage as a cold engine. As the sensors 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 displays 0-255 counts. This 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 displays 0-5 volts. This 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, and at 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 displays 0-100 percent. This represents the actual position of the exhaust gas recirculation (EGR) pintle in percent. Zero percent displayed indicates a fully extended pintle, and that the EGR valve is closed.

EGR Position Sensor: The scan tool displays 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, and a closed valve. A voltage near 5 volts indicates a fully retracted pintle, or open valve.

EGR Position Variance: The scan tool displays 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 Error reaches an unacceptable level, DTC P1406 will set.

EGR Solenoid Circuit History: Scan Tool Displays--Fault or OK. This parameter saves the state of the driver circuit for this device.

EGR Solenoid Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

EGR Solenoid Command: Exhaust gas recirculation (EGR) Solenoid Command indicates the EGR valve driver pulse width modulation (PWM) signal from the powertrain control module (PCM). A duty cycle of 0 percent indicates that an EGR flow is not being commanded. A 100 percent duty cycle indicates maximum EGR flow commanded.

Engine Load: The scan tool displays 0-100 percent. The 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: Engine Oil Level Switch indicates the electrical state of the switch. The scan tool displays OK or Low.

Engine Run Time: The scan tool displays 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 displays 0-9999 RPM. The engine speed is computed by the powertrain control module (PCM) from the 3X reference input. The engine speed 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. The evaporative emission (EVAP) Fault History indicates the status of the EVAP system diagnostics performed by the powertrain control module (PCM).

EVAP Purge Solenoid Circuit Status: Evaporative emission (EVAP) Purge Solenoid Circuit Status indicates the condition of the control circuit. The scan tool displays OK, Fault or Invalid state.

EVAP Purge Solenoid Command: The scan tool displays 0-100 percent. This represents the powertrain control module (PCM) commanded pulse width modulation (PWM) duty cycle of the evaporative emission (EVAP) purge valve. Zero percent displayed indicates a lack of purge. A 100 percent displayed indicates full purge.

EVAP Test Abort Reason: Evaporative emission (EVAP) Test Abort Reason indicates the reason the EVAP test was aborted. The scan tool displays EXCESS VACUUM, PURGE VALVE LEAK, SMALL LEAK or WEAK VACUUM.

EVAP Test Result: Scan Tool Displays--No Results, Passed, Aborted, Fail DTC P0440, Fail DTC P0442, Fail DTC P0446, Fail DTC 1441. 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: Scan Tool Displays-- Test Completed, Test Running, Wait for Purge . Indicates the current status of the evaporative emission (EVAP) diagnostic routine.

EVAP Vent Solenoid Command: The scan tool displays Not Venting or Venting. The scan tool displays Not Venting when the vent is commanded closed. The scan tool will show venting when the vent is commanded open.

FC Relay 1 Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

FC Relay 1 Command: The scan tool displays ON or OFF. This represents the powertrain control module (PCM) commanded state of both fans.

FC Relay 2 and 3 Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

FC Relay 2 and 3 Command: The scan tool displays ON or OFF. This represents the powertrain control module (PCM) commanded state of both fans.

Fuel Pump Relay Circuit History Status: The scan tool displays OK, Stuck Low, which means stuck open, or Stuck High. These parameters describe the condition of the fuel pump control circuit.

Fuel Pump Relay Circuit Status: The scan tool displays OK, Stuck Low, which means stuck open, or Stuck High. These parameters describe the condition of the fuel pump control circuit. If a fault is detected the scan tool will list which the fault type.

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: The scan tool displays 0-100 percent. The scan tool displays in percentage the amount of fuel in the fuel tank.

Fuel Tank Pressure Sensor: Scan Tool Displays--0-5 volts or -17.5 to +7.5 in of H2O Fuel tank pressure (FTP) is used extensively for evaporative emission (EVAP) purge control and EVAP system diagnostics.

Fuel Trim Cell: The scan tool displays 0-9 fuel trim (FT) 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 YES or NO. If conditions are appropriate for enabling long-term fuel trim (FT) corrections, FUEL TRIM LEARN will display yes. This indicates that the long-term FT is responding to short-term FT. If the Fuel Trim Learn displays NO, long-term FT will not respond to changes in short-term FT.

Generator 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 Bank 1 Sensor 1/ Bank 2 Sensor 1/ Bank 1 Sensor 2:  The scan tool displays 0-1132 mV. This represents the fuel control exhaust oxygen sensor (O2S) output voltage. The voltage should fluctuate constantly within a range between 10 mV and 1,000 mV, while operating in Closed Loop. Ten millivolts indicates a lean exhaust, and 1,000 mV indicates a rich exhaust.

IAT: The scan tool displays -40 to +151°C ( -40 to +304°F). The powertrain control module (PCM) converts the resistance of the intake air temperature (IAT) sensor to degrees. The PCM uses intake air temperature to adjust fuel delivery and spark timing according to incoming air density. IAT is also compared to engine coolant temperature (ECT) at startup to identify cold starts for the heated oxygen sensor (HO2S) heater and the evaporative emissions (EVAP) diagnostics.

Ignition 1 Signal: The scan tool displays 0-25.5 volts. This represents the system voltage measured by the powertrain control module (PCM) at the ignition feed.

Ignition Mode: The scan tool displays BYPASS or ignition control (IC). This indicates the commanded state of the bypass signal output from the powertrain control module (PCM). If BYPASS is displayed, the ignition control module (ICM) is controlling the spark advance at a fixed 10 degrees before top dead center (BTDC). An IC displayed indicates that the PCM has requested control of the spark advance. The ICM 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 ICM bypass circuit if conditions are appropriate for PCM control of spark timing. If the PCM does not apply 5 volts to the bypass circuit, or if the ICM does not receive the signal, the module will control spark timing.

Injector PWM: The scan tool displays 0-1,000 msec. This indicates the amount of time the powertrain control module (PCM) is commanding each injector ON during each engine cycle. A longer injector pulse width will cause more fuel to be delivered. Injector pulse width should increase with increased engine load.

Knock Retard: The scan tool displays 0-25.5 degrees. This indicates the amount of spark the powertrain control module (PCM) is removing from ignition control (IC ) spark advance in response to the signal from the knock sensors (KS). The desired torque signal from the electronic brake and traction control module (EBTCM) may cause knock retard to display a value greater than 0 degrees if the traction control is active.

Long Term FT Bank 1/Bank 2: The scan tool displays -23 to +16 percent. Long-term fuel trim (FT) is derived from the short-term FT value, and represents a long-term correction of fuel delivery. A value of 0 percent indicates that fuel delivery does not require 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 that the fuel delivery is being reduced. A positive value, significantly greater than 0 percent, indicates that a lean condition exists, and that the PCM is compensating by adding fuel. Thus, a decreased injector pulse width means the fuel delivery is being reduced, and an increased injector pulse width means that fuel is being added. Long-term FT tends to follow short-term FT. A value in the negative range which is due to canister purge at idle should not be considered unusual. The maximum authority of the PCM to control long-term FT allows a range between -23 to +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 O2S voltage. In Open Loop, the PCM ignores the oxygen sensor (O2S) 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 displays 0.0-512 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 displays 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 (WOT). The PCM converts this frequency signal to grams per second to be displayed on the scan tool as MAF.

MAP Sensor: The scan tool displays 10-105 kPa (0.00- 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 pressure (BARO) reading, and as an enabling factor for many of the diagnostic tests.

MIL Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

MIL Command: Listed in Eng 2 Data list--The scan tool displays ON or OFF. This indicates the powertrain control module (PCM) commanded state of the malfunction indicator lamp (MIL).

Misfire Current Cyl. 1-6: The scan tool displays 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 displays 0-65,535 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): Scan Tool Displays-- number This parameter displays the quantity of active DTCs.

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.

Reduced Engine Power: The scan tool displays ACTIVE or INACTIVE. The scan tool displays Active when the powertrain control module (PCM) has diagnosed a ETC condition or during drivetrain abuse protection. The PCM limits the engine power.

Short Term FT Bank 1/ Bank 2: The scan tool displays -11 to +20 percent. Short-term fuel trim (FT) represents a short-term correction to fuel delivery by the powertrain control module (PCM). This correction is in response to the amount of time the fuel control oxygen senor (O2S) voltage spends above or below the 450 mV threshold. If the O2S voltage has remained less than 450 mV, indicating a lean air/fuel mixture, the short-term FT will increase into the positive range above 0 percent, and the PCM will add fuel. If the O2S voltage stays above the threshold, short-term FT 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 maximum authority of the PCM to control FT allows a range between -11 to +20 percent. Fuel trim values at maximum authority may indicate an excessively rich or lean system.

Spark: The scan tool displays -64 to +64 degrees. Displays the spark timing being commanded by the powertrain control module (PCM) on the ignition control (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 (ICM) 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: 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.

Starter Relay Command: Starter Relay Command indicates the commanded state of the starter relay control circuit. The scan tool displays ON or OFF.

Start-Up ECT: The scan tool displays -40 to +151°C, -40 to +304°F. This indicates the engine coolant temperature (ECT) 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 displays -40 to +151°C, -40 to +304°F. This indicates the intake air temperature (IAT) at the time that the vehicle was started. The IAT is used by the HO2S diagnostic to determine if the last startup was a cold start.

Stoplamp Pedal Switch: Stoplamp Pedal Switch indicates the state of the stoplamp switch. The scan tool displays Applied or Released.

TAC/PCM Communication Signal: The scan tool displays OK or FAULT. If the communication between the throttle actuator control (TAC) module and the powertrain control module (PCM) is interrupted the scan tool displays FAULT. The scan tool displays OK under the normal operating conditions.

TCC/Cruise Brake Pedal Switch: The scan tool displays APPLIED or RELEASED. This indicates the brake pedal position.

TCC Enable Solenoid Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

TCC Enable Solenoid Command: Torque converter clutch (TCC) Enable Solenoid Command indicates the commanded state of the control circuit. The scan tool displays ON or OFF.

TCS Circuit History: The scan tool displays OK, Fault or Invalid state. These parameters describe the history of the control circuit.

TCS Circuit Status: The scan tool displays OK, Fault or Invalid state. These parameters describe the condition of the control circuit.

TP Desired Angle: The scan tool displays 0-100 percent. The powertrain control module (PCM) indicates the desired throttle angle for conditions present at that time.

TP Indicated Angle: The scan tool displays 0-100 percent. The throttle position (TP) Indicated angle displays in percentage the amount of throttle opening.

TP Sensor 1/2: The scan tool displays 0-5 volts. The scan tool displays the amount of throttle opening in volts. Closed throttle displays approximately 1 volt and wide open throttle (WOT) displays approximately 4 volts.

TP Sensor 1/2: The scan tool displays 0-100 percent. The scan tool displays the amount of throttle opening in percentage. Closed throttle displays 0 percent and wide open throttle (WOT) displays near 100 percent.

TP Sensors 1 and 2: The scan tool displays Agree or Disagree. If the throttle actuator control (TAC) module receives a signal voltage from one of the throttle position (TP) sensors not in proper relationship to the other, the scan tool displays Disagree. The scan tool displays Agree under normal operating conditions.

Traction Control Status (If Equipped): The scan tool displays ACTIVE or INACTIVE. Active will be displayed if a message is received from the electronic brake and traction control module (EBTCM) requesting torque reduction.

TR Sw.: Transmission range (TR) switch indicates the position of the transmission range switch. The scan tool displays Park, Reverse, or Neutral.

Torque Delivered Signal (If Equipped): The scan tool range is 0-100 percent. This 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 and 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): Scan tool range 0-100 percent. This represents the pulse width modulation (PWM) signal from the electronic brake and traction control module (EBTCM). The 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, 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 condition with the Traction Control Desired Torque signal should cause a DTC to set.

Vehicle Speed Sensor: The scan tool displays 0-255 km/h (0-155 mph). The vehicle speed sensor (VSS) signal is converted into kilometers per hour and miles per hour for display.

VTD Fuel Enable: Vehicle theft deterrent (VTD) Fuel Enable indicates if the theft deterrent is enabling fuel. The scan tool displays Enable or Disable.