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

24X Crank Sensor: This parameter displays the speed of the crankshaft as calculated from the medium resolution engine speed signal by the control module. A high RPM indicates a high engine speed. A low RPM indicates a low engine speed.

5 volts Reference 1: This parameter displays the voltage sensed on the 5-volt reference 1 circuit at the control module. The scan tool will display a higher value at higher voltage. the scan tool will display a lower value at lower voltage.

5 volts Reference 2: This parameter displays the voltage sensed on the 5-volt reference 2 circuit at the control module. The scan tool will display a higher value at higher voltage. the scan tool will display a lower value at lower voltage.

A/C Off For WOT: This parameter displays the commanded state of the air conditioning (A/C) clutch relay based on throttle position. The control module disables the A/C clutch relay when the throttle position is near wide open (WOT). The scan tool will display Yes or No. Yes indicates the control module has sensed a WOT condition, and removed the ground control from the A/C clutch relay. No indicates the control module is grounding the control circuit of the A/C clutch relay, engaging the A/C compressor clutch.

A/C Pressure Disable: This parameter displays the commanded state of the air conditioning (A/C) clutch relay based on a signal from the A/C high side pressure sensor. The control module will disable A/C due to an excessive high or low pressure. The scan tool will display Yes or No. Yes indicated the control module has removed the ground from the A/C clutch relay due to an improper A/C refrigerant operating pressure. No indicates the refrigerant pressure is normal and the control module is operating the relay under normal conditions.

A/C Relay Command: This parameter displays the commanded state of the air conditioning (A/C) clutch relay control circuit. The scan tool will display ON or OFF. ON indicates the A/C clutch relay control circuit is being grounded by the control module, allowing voltage to the A/C compressor clutch. OFF indicates the A/C clutch relay is not being commanded on by the control module.

A/C Request Signal: This parameter displays the state of the air conditioning (A/C) request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. The scan tool will display Yes or No. Yes indicates the control module is receiving a request from the HVAC system to ground the A/C clutch relay control circuit, engaging the A/C compressor clutch. No indicates the control module is not receiving a request from the HVAC system to ground the A/C clutch relay control circuit.

Air Fuel Ratio: This parameter displays the ratio of air to fuel as calculated by the control module based on various sensor inputs. The scan tool will display a lower air fuel ratio when a richer air to fuel mixture is commanded. The scan tool will display a higher air fuel ratio when a leaner air to fuel mixture is commanded. In closed loop operation the air fuel ratio should normally be around 14.2-14.7 to 1.

AIR Pump Relay Command: This parameter displays the commanded state of the secondary air injection (AIR) pump relay control circuit. The scan tool will display ON or OFF. ON indicates the AIR pump relay control circuit is being grounded by the control module, allowing voltage to the AIR pump. OFF indicates the AIR pump relay is not being commanded on by the control module.

AIR Solenoid Command: This parameter displays the commanded state of the secondary air injection (AIR) solenoid control circuit. The scan tool will display ON or OFF. ON indicates the AIR solenoid control circuit is being grounded by the control module, opening the AIR solenoid and allowing vacuum to the shutoff or combination valve(s). OFF indicates the AIR solenoid is not being commanded on by the control module.

BARO: This parameter displays the barometric pressure as calculated by the control module using the signal from the manifold absolute pressure (MAP) sensor measured when the ignition is turned on with the engine not running. The control module will update the barometric pressure during wide-open throttle (WOT) conditions.

CKP Sensor Status: This parameter displays the mode the control module is using for crankshaft position sensing. The scan tool will display Angle when the control module is utilizing both crankshaft position (CKP) sensor A and CKP sensor B for engine position sensing. The scan tool will display Time A when the control module is using CKP sensor A for engine position sensing. The scan tool will display Time B when the control module is using CKP sensor B for engine position sensing.

CMP Sensor: This parameter displays the speed of the engine as calculated by the control module using the signal from the camshaft position (CMP) sensor . The scan tool will display a higher value as engine speed is increased. the scan tool will display a lower value as the engine speed is decreased.

Cold Startup: This parameter displays whether the engine meets the conditions for a cold startup during the present ignition cycle. The scan tool displays Yes when the conditions for a cold startup are met during this ignition cycle. The scan tool displays No when the conditions for a cold startup are not met during the present ignition cycle. Conditions for a cold startup require the coolant temperature and the intake air temperature to be below a predetermined temperature and within a certain range of each other. These conditions must occur after the engine was warmed up to a specific temperature during the previous ignition cycle.

Commanded Gear: This parameter displays the transmission gear commanded by the control module. The scan tool will display P/N when the transmission is commanded to park or neutral. The scan tool will display R when the transmission is commanded to reverse. The scan tool will display 1-5 when the transmission is commanded into a specific low gear.

Crank Request Signal: This parameter displays the state of the crank request input to the control module from the ignition switch. The scan tool will display Yes when the ignition switch is in the Crank position. The scan tool will display No when the ignition switch is in any other position.

Cruise Control Active: This parameter displays the status of the cruise control system as determined by the control module. The scan tool will display Yes when the cruise control system is in control of vehicle speed. The scan tool will display No when the cruise control system is not operating.

Cruise Inhibit Signal Command: This parameter displays the commanded state of the cruise inhibit signal circuit. The scan tool will display On when the control module is inhibiting cruise control operation. The scan tool will display Off when the control module is allowing cruise control operation.

Cycles Of Misfire Data: This parameter displays the number of cylinder firing events that were recorded as misfires as determined by the control module. the scan tool will display a high value as misfire events increase. The scan tool will display a lower value when there are fewer misfire events.

Decel. Fuel Cutoff: This parameter displays the status of the operating mode used to turn off the fuel injectors during certain deceleration conditions. When the scan tool displays Active, the control module has turned off the fuel injectors. When the scan tool displays Inactive, the fuel system is operating normally.

Desired EGR Position: This parameter displays the position of the exhaust gas recirculation (EGR) valve commanded by the control module. The scan tool will display 0 percent when the control module is commanding the EGR valve closed. The scan tool will display a higher percentage when the EGR valve is commanded open.

Desired Idle Speed: This parameter displays the engine idle speed in RPM as commanded by the control module. The control module compensates for various engine loads in order to maintain the desired engine speed at idle. This parameter is not valid unless the engine is running.

ECT Sensor: This parameter displays the temperature of the engine coolant calculated by the control module, based on the input from the engine coolant temperature sensor. When the coolant temperature is low, the scan tool will display a low temperature. When the coolant temperature is high, the scan tool will display a high temperature.

EGR Flow Test Count: This parameter displays the number of EGR flow test samples collected during the current ignition cycle. The maximum number of samples allowed is 1 during normal operation. If the PCM battery voltage has been disconnected or an EGR DTC has been cleared, several EGR flow test samples will be allowed during the next ignition cycle. The scan tool will display a higher value for more samples. The scan tool will display a lower value for fewer samples.

EGR Learned Minimum Position: This parameter displays the learned minimum position of the EGR valve as calculated by the control module. The scan tool will display the voltage that the EGR valve has sent to the control module for the last closed position.

EGR Position Sensor: This parameter displays the voltage signal received from the exhaust gas recirculation (EGR) valve position sensor by the control module. The scan tool will display a lower value when the EGR valve is closed, and a higher value when the EGR valve is open.

EGR Position Sensor: This parameter displays EGR valve position as calculated by the control module based on an input from the exhaust gas recirculation (EGR) valve position sensor. The scan tool will display a lower value when the EGR valve is closed, and a higher value when the EGR valve is open.

EGR Solenoid Command: This parameter displays the duty cycle commanded by the control module for the EGR valve. The scan tool will display a high percentage when the EGR valve is commanded open. The scan tool will display a low percentage when the EGR valve is commanded closed.

Engine Load: This parameter displays the engine load in percent based on inputs to the control module from various engine sensors. The scan tool will display a low percentage when the engine is at idle with little or no load. The scan tool will display a high percentage when the engine is running at a high RPM under a heavy load.

Engine Oil Level Switch: This parameter displays the status of the engine oil level switch as determined by the control module. The control module uses this information to turn on the low engine oil lamp if the engine oil level remains approximately 1 quart low for a sufficient amount of time. The scan tool will display Low when the engine oil level is low. The scan tool will display OK when the engine oil level is correct.

Engine Oil Pressure Sensor: This parameter displays the voltage signal sent to the control module from the engine oil pressure sensor. The engine oil pressure sensor has a range of values indicating a low oil pressure when the voltage is low to a high oil pressure when the voltage is high.

Engine Oil Pressure Switch: This parameter displays the state of the engine oil pressure as determined by the control module. The control module monitors the engine oil pressure switch to determine if the engine oil pressure is sufficient. The scan tool will display low when the engine oil pressure is below a predetermined value. The scan tool will display OK when the engine oil pressure is adequate.

Engine Run Time: This parameter displays the time elapsed since the engine was started. The scan tool will display the time in hours, minutes and seconds. The engine run time will reset to zero when the engine stops running.

Engine Speed: This parameter displays the speed of the crankshaft as determined by the control module using an input from the crankshaft position (CKP) sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds.

EVAP Fault History: This parameter displays the result of the EVAP system diagnostic as determined by the control module. The scan tool will display various messages, depending on the result of the test.

EVAP Purge Solenoid Command: This parameter displays the on-time or duty cycle of the evaporative emission (EVAP) purge solenoid commanded by the control module expressed as a percent. The scan tool will display a high percentage when the control module is commanding the EVAP purge solenoid to be open a large amount . The scan tool will display a low percentage when the control module is commanding the EVAP purge solenoid to be open a small amount. The scan tool will display 0 when the control module is commanding the EVAP purge solenoid closed.

EVAP Test Abort Reason: This parameter displays the reason the EVAP test was aborted by the control module. The scan tool will display various messaged to indicate the reason the last test failed to complete.

EVAP Test Result: This parameter displays the result of the EVAP test performed by the control module. The scan tool will display various messaged to indicate the final result of the test.

EVAP Test State: This parameter displays the status of the EVAP test performed by the control module. The scan tool will display various messaged to indicate the current status of the test. The scan tool will display Wait For Purge, Test Running, or Test Complete.

EVAP Vent Solenoid Command: This parameter displays the state of the evaporative emission (EVAP) vent solenoid commanded by the control module. The scan tool will display a venting when the control module is commanding the EVAP vent solenoid to be open . The scan tool will display a not venting when the control module is commanding the EVAP vent solenoid to be closed.

Extended Travel Brake Pedal Switch: This parameter displays the state of the brake pedal as determined by the extended travel brake pedal switch. The scan tool will display Applied when the brake pedal is depressed greater than approximately 40 percent of the total travel.

FC Relay 1 Command: This parameter displays the commanded state of the cooling fan relay 1 control circuit. The cooling fan relay 1 should be on when the scan tool indicates the FC Relay 1 Command is On. The cooling fan relay 1 should be off when the scan tool indicates the FC Relay 1 Command is Off.

FC Relay 2 Command: This parameter displays the commanded state of the cooling fan relay 2 control circuit. The cooling fan relay 2 should be on when the scan tool indicates the FC Relay 2 Command is On. The cooling fan relay 2 should be off when the scan tool indicates the FC Relay 2 Command is Off.

Fuel Level Sensor: This parameter displays the voltage received by the control module from the sensor used to monitor the fuel level inside the fuel tank. The scan tool will display a low voltage when the fuel level in the tank is low or near empty. The scan tool will display a high voltage reading when the fuel level in the tank is high or near full.

Fuel Pump Relay Command: This parameter displays the commanded state of the fuel pump relay control circuit. The fuel pump relay should be on when the scan tool indicates the Fuel Pump Relay Command is On. The fuel pump relay should be off when the scan tool indicates the Fuel Pump Relay Command is Off.

Fuel Tank Level Remaining: This parameter displays the amount of fuel remaining in the fuel tank as measured in liters or gallons. The control module determines the amount of fuel remaining in the tank by using information from the fuel level sensor(s). The scan tool will display a higher value with a full fuel tank, and a lower value with an empty fuel tank.

Fuel Tank Pressure Sensor: This parameter displays the voltage signal sent to the control module from the sensor used to monitor the pressure inside the fuel tank. The scan tool will display a low voltage when the pressure in the fuel tank is high. The scan tool will display a high voltage when the pressure in the fuel tank is low or in a vacuum.

Fuel Tank Pressure Sensor: This parameter displays the fuel tank pressure as calculated based on a signal sent to the control module from the fuel tank pressure (FTP) sensor. The scan tool will display a low value when the pressure in the fuel tank is low or a vacuum. The scan tool will display a high value when the pressure in the fuel tank is high.

Fuel Trim Cell: This parameter displays the fuel trim cell number as calculated by the control module based on engine speed and load inputs. The scan tool will display a lower number as conditions are nearer to idle, and a higher value as conditions approach maximum engine speed and maximum load.

Fuel Trim Index: scan tool displays counts (0-255), -100 to +100%. The fuel trim index is a combined value of EVAP Purge learn memory, Long Term Fuel Trim, and Short Term Fuel Trim and is used by the PCM as part of the entry criteria of the fuel trim diagnostic. Results of the actual Fuel Trim Index are compared to a minimum and maximum calibration to pass or fail the Fuel Trim Diagnostic.

Fuel Trim Learn: This parameter indicated if the control module is being commanded to adjusting long term fuel trim in response to the short term fuel trim. The scan tool displays Enabled or Disabled. When fuel trim is being learned because of an external command, the scan tool displays Enabled. Under normal conditions the scan tool displays Disabled.

GEN L-Terminal Signal: This parameter indicates whether the control module is allowing the generator to operate. The control module can disable the generator under certain conditions. The scan tool will display voltage if the control module is allowing generator operation, while no voltage indicates that the control module is not allowing generator operation.

GEN F-Terminal Signal : . This parameter indicates the generator field duty cycle as commanded by the voltage regulator or control module. The scan tool will display a higher value for a higher commanded generator output, and a lower value for a lower commanded generator output.

HO2S Bank 1 Sensor 1: This parameter indicates the heated oxygen sensor (HO2S) bank 1 sensor 1 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions.

HO2S Bank 1 Sensor 2: This parameter indicates the heated oxygen sensor (HO2S) bank 1 sensor 2 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions. The post-catalyst HO2S output voltage will fluctuate slowly over a longer period of time, compared to the fuel control oxygen sensor s. This is due to the oxygen storage capacity of an efficiently operating catalyst.

HO2S Bank 2 Sensor 1: This parameter indicates the heated oxygen sensor (HO2S) bank 2 sensor 1 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions.

HO2S Heater Bn 1 Sen. 1: This parameter displays the current through the control module when the bank 1 sensor 1 HO2S heater is commanded ON by the control module. HO2S Heater Bn 1 Sen. 1 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.

HO2S Heater Bn 1 Sen. 2: This parameter displays the current through the control module when the bank 1 sensor 2 HO2S heater is commanded ON by the control module. HO2S Heater Bn 1 Sen. 2 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.

HO2S Heater Bn 2 Sen. 1: This parameter displays the current through the control module when the bank 2 sensor 1 HO2S heater is commanded ON by the control module. HO2S Heater Bn 2 Sen. 1 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.

IAC Position: This parameter displays the commanded position of the IAC motor by the control module. The scan tool will display a lower value if the valve is being commanded closed. The scan tool will display a higher value when the valve is commanded open.

IAT Sensor: This parameter displays the temperature of the air entering the engine as calculated by the control module based on the input from the intake air temperature sensor. The scan tool will display a low value when the air temperature is low, and a high value when the air temperature is high.

Ignition 1 Signal: This parameter displays the voltage measured at the ignition 1 circuit of the control module. Voltage is applied to the control module when the ignition switch is in the ignition 1 position. The scan tool will display a low value when the voltage is low. The scan tool will display a high value, such as battery voltage, when the voltage is higher.

IMS: This parameter indicates the transmission gear select position as calculated by the control module based on two A/B inputs from the automatic transmission fluid pressure manual valve position switch. The scan tool displays Park/Neutral, Reverse, Drive, or Invalid, depending on gear position.

Injector PWM Bank 1 Average: This parameter indicates the average commanded ON time for each injector on bank 1 by the control module. The scan tool will display a larger value for a longer injector commanded ON time, causing more fuel to be delivered to the cylinders. The scan tool will display a smaller value for a shorter injector commanded ON time, causing less fuel to be delivered to the cylinders.

Injector PWM Bank 2 Average: This parameter indicates the average commanded ON time for each injector on bank 2 by the control module. The scan tool will display a larger value for a longer injector commanded ON time, causing more fuel to be delivered to the cylinders. The scan tool will display a smaller value for a shorter injector commanded ON time, causing less fuel to be delivered to the cylinders.

Knock Retard: This parameter indicates the amount of spark advance the control module removes from the ignition control (IC) spark advance in response to the signal from the knock sensor(s). the scan tool displays a high value for a large amount of spark retard, and a low value for a small amount of spark retard.

Long Term FT Bank 1: This parameter is calculated by the control module based on the Short Term FT value. The Long Term FT bank 1 is used for the long term correction of the fuel delivery in bank 1. The scan tool will a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event.

Long Term FT Bank 2: This parameter is calculated by the control module based on the Short Term FT value. The Long Term FT bank 2 is used for the long term correction of the fuel delivery in bank 1. The scan tool will a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event.

Loop Status: This parameter indicates the status of the fuel delivery by the control module. The scan tool will display Closed Loop if the control module is controlling the fuel delivery according to the heated oxygen sensor (HO2S ) voltages. The scan tool will display Open Loop if the control module controls fuel delivery based on throttle position, coolant temperature, and air flow inputs only. The vehicle will run in open loop until all of the conditions are met to allow Closed Loop operation.

MAF Sensor: This parameter indicates the quantity calculated by the control module based on a signal from the mass airflow (MAF) sensor. The scan tool will display a high value at high engine speeds, and a low value at low engine speeds.

MAF Sensor: This parameter indicates the frequency signal received from the mass airflow (MAF) sensor by the control module. The scan tool will display a high value at high engine speeds, and a low value at low engine speeds.

MAP Sensor: This parameter indicates the manifold absolute pressure inside the engine as calculated by the control module based on the signal from the manifold absolute pressure (MAP) sensor. The scan tool will display a higher value wide open throttle, and a lower value at idle.

MAP Sensor: This parameter indicates the voltage signal received by the control module from the manifold absolute pressure (MAP) sensor. The scan tool displays a low voltage at idle, and a high voltage at wide open throttle. Barometric pressure and altitude can effect these values.

MIL Command: This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit. The malfunction indicator lamp should be on when the scan tool indicates the MIL Command is On. The malfunction indicator lamp should be off when the scan tool indicates the MIL Command is Off. The control module will command the MIL On when the ignition is ON with the engine OFF in order to perform a bulb check.

Misfire Current Cyl. #1: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 1 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #2: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 2 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #3: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 3 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #4: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 4 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #5: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 5 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #6: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 6 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #7: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 7 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire Current Cyl. #8: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinder 8 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #1: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 1 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #2: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 2 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #3: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 3 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #4: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 4 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #5: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 5 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #6: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 6 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #7: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 7 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. #8: This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinder 8 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Odometer: This parameter displays the mileage on the vehicle as calculated by the control module. The scan tool will display an increasing value as the vehicle is driven. This may be changed during a control module replacement.

PCM / VCM in VTD Fail Enable: This parameter indicates the status of the control module communication with the body control module (BCM) The scan tool will display YES if the body control module (BCM) and the control module lose communications with each other after the BCM sends the correct password. The scan tool displays No if the BCM is communicating the correct password to the control module.

PCM Reset: This parameter indicates when the internal control module resets. The scan tool displays YES when an internal PCM reset has occurred. The scan tool displays NO under the normal operating conditions.

Power Enrichment: This parameter indicates if the control module has detected conditions appropriate to operate in Power Enrichment mode. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation. The control module enters Open Loop operation and increases injector pulse width when in power enrichment mode.

Powertrain Induced Chassis Pitch Command: This parameter indicates if the control module has detected conditions that would induce the chassis to pitch. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation.

Short Term FT Bank 1: This parameter displays the short term correction to fuel delivery for bank 1 by the control module in response to the amount of time the oxygen sensor voltage spends above or below the 450 mV threshold. The scan tool will display 0 percent if no adjustments are required. the scan tool will display a higher positive value if fuel has to be added, and a higher negative value if fuel has to be removed.

Short Term FT Bank 2: This parameter displays the short term correction to fuel delivery for bank 2 by the control module in response to the amount of time the oxygen sensor voltage spends above or below the 450 mV threshold. The scan tool will display 0 percent if no adjustments are required. the scan tool will display a higher positive value if fuel has to be added, and a higher negative value if fuel has to be removed.

Spark: This parameter displays the spark timing being commanded by the control module on the IC circuit. The scan tool will display a negative value if the spark timing is before top dead center (BTDC) or spark advance; the scan tool will display a positive value if the spark timing is after top dead center (ATDC) or spark retard. Because the ignition control module sets spark advance at a fixed value BTDC while operating in bypass mode, the displayed spark advance only reflects true spark timing when the PCM has commanded IC mode.

Start Up ECT: This parameter Indicates the engine coolant temperature at engine start up as calculated by the control module based on the signal from the ECT sensor. the scan tool will display a higher value on a warmer engine, and a lower value on a colder engine.

Start Up IAT: This parameter Indicates the intake air temperature at engine start up as calculated by the control module based on the signal from the IAT sensor. the scan tool will display a higher value during warmer underhood temperatures, , and a lower value during colder underhood temperatures.

Starter Relay Command: This parameter displays the commanded state of the starter relay control circuit. The starter relay should be on when the scan tool indicates the Starter Relay Command is On. The starter relay should be off when the scan tool indicates the Starter Relay Command is Off.

TCC/Cruise Brake Pedal Switch: This parameter displays the state of the brake pedal as determined by the control module. The control module monitors the pedal switch on the brake pedal for vehicles equipped with an automatic transmission. The control module uses this information to release the torque convertor clutch when the brake pedal is applied. The scan tool will display Applied when the brake pedal is depressed. the scan tool will display Released when the brake pedal is not applied.

TCC Enable Solenoid Command: This parameter displays the commanded state of the torque converter clutch (TCC) solenoid control circuit. The scan tool will indicate the TCC Enable solenoid is Enabled if the control module is commanding the solenoid ON. The scan tool will display Disabled if the control module is commanding the solenoid OFF.

Torque Delivered Signal: This parameter indicates the torque delivered from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.

Torque Request Signal: This parameter indicates the torque requested from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.

TP Sensor: This parameter displays the voltage signal sent to the control module from the sensor used to monitor the position of the throttle plates. The scan tool will display a low voltage when the throttle plates are at rest. The scan tool will display a high voltage when the throttle plates are fully open.

TP Sensor: This parameter displays the angle of the throttle position (TP) sensor in percent. This information is calculated by the control module using the signal from the throttle position sensor. The scan tool will display a low percentage when the throttle plates are closed. The scan tool will display a high percentage when the throttle plates are fully open.

Traction Control Status: This parameter indicates the status of the traction control system as reported by the control module. The scan tool will display ACTIVE if the traction control system is taking action to reduce drive wheel slippage. The scan tool will display INACTIVE if the traction control system is not being required to take action to reduce drive wheel slippage.

TWC Temperature Calculated: This parameter indicates the temperature of the catalytic converter as calculated by the control module based on various system inputs. The scan tool will display a higher value at higher catalytic converter temperatures. the scan tool will display lower values at lower catalytic converter temperatures.

Vehicle Speed: This parameter indicates the vehicle speed as calculated by the control module based on a signal from the vehicle speed sensor (VSS). the scan tool will display a higher value at higher vehicle speeds, and a lower value at lower vehicle speeds.

VTD Auto Learn Timer: This parameter indicates the status of the theft deterrent system password learn. The scan tool will display ACTIVE if the system is ready to learn a new password. The scan tool will display INACTIVE if the theft deterrent system is not ready to learn a new password.

VTD Fuel Disable: This parameter Indicates if the theft deterrent system is disabling fuel delivery. The scan tool will display ACTIVE if the fuel delivery is being disabled by the theft deterrent system. The scan tool will display INACTIVE if the theft deterrent system is not disabling fuel delivery.

VTD Fuel Disable Until Ign. Off : This parameter Indicates if the theft deterrent system is disabling fuel delivery until the next ignition cycle. The scan tool will display YES if the fuel delivery is being disabled by the theft deterrent system. The scan tool will display NO if the theft deterrent system is not disabling fuel delivery.