Scan Tool Data Definitions 2

SCAN TOOL DATA DEFINITIONS

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 Bank 2 Sensor 2: This parameter indicates the heated oxygen sensor (HO2S) bank 2 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 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.

HO2S Heater Bn 2 Sen. 2: This parameter displays the current through the control module when the bank 2 sensor 2 HO2S heater is commanded ON by the control module. HO2S Heater Bn 2 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.

Hot Open Loop: This parameter indicates the status of the fuel delivery system. The scan tool will display Active if the fuel system is running in open loop due to a temperature concern. The scan tool will display Inactive if the fuel system is operating normally.

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 0 Signal: This parameter displays the state of the ignition 0 input to the control module from the ignition switch. The scan tool will display On when the ignition switch is in the ignition 0 position. The scan tool will display Off when the ignition switch is in any other position.

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.

Ignition Spark Efficiency: This parameter indicates how much of the ignition capacity is being required to operate the engine as calculated by the control module. The scan tool will display a high value when more spark is require, such as high load conditions. The scan tool will display low values when less spark is required, such as at idle.

Initial Brake applied signal: This parameter indicates the status of the initial brake applied switch as determined by the control module. The scan tool will display applied when the brake pedal is depressed. The scan tool will display released when the brake pedal is not depressed.

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.

Injector 1-8 Command: This parameter displays the commanded on time of each fuel injector by the control module. The scan tool will display a low value at idle, and a high value during high engine speeds and loads.

Instant FT Bank 1: This parameter indicates the instant fuel trim of Bank 1 as calculated by the control module. The scan tool will display a low value when little fuel is being required, and a higher value when more fuel is being required to maintain proper fuel trim.

Instant FT Bank 2: This parameter indicates the instant fuel trim of Bank 2 as calculated by the control module. The scan tool will display a low value when little fuel is being required, and a higher value when more fuel is being required to maintain proper fuel trim.

Int. CMP Angle Bank 1 or Bank 2 Signal: This parameter displays the degrees of retarded intake camshaft angle related to crankshaft position.

Int. CMP Angle Bank 1 or Bank 2 Command: This parameter displays the degrees of retarded intake camshaft angle as commanded by the ECM.

Inj. PWM Average Bank 1 or Bank 2: This parameter displays the average pulse width modulation (PWM) of the fuel injectors for bank 1 as determined by the control module.

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.

LT FT Bank 1 High RPM/Load: This parameter is calculated by the control module based on the Short Term FT value under High RPM/Load conditions. 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.

LT FT Bank 2 High RPM/Load: This parameter is calculated by the control module based on the Short Term FT value under High RPM/Load conditions. The Long Term FT bank 2 is used for the long term correction of the fuel delivery in bank 2. 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.

LT FT Bank 1 low RPM/Load: This parameter is calculated by the control module based on the Short Term FT value under low RPM/Load conditions. 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.

LT FT Bank 2 low RPM/Load: This parameter is calculated by the control module based on the Short Term FT value under low RPM/Load conditions. The Long Term FT bank 2 is used for the long term correction of the fuel delivery in bank 2. 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 air flow (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 air flow (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.

MIL Circuit Status: This parameter displays the diagnostic state of the output driver for the malfunction indicator lamp control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

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.

MIL Requested by DTC: This parameter indicates the reason the control module illuminated the MIL. The scan tool will display YES when the MIL is requested as a result of an A or B type DTC. The scan tool will display NO if the MIL is illuminated for another reason, such as transmission DTCs.

Mileage Since DTC Cleared: This parameter displays the mileage accumulated since an emission diagnostic trouble code was cleared. The scan tool will display increasing mileage as the vehicle is driven.

Misfire Detects Rough Road: This Parameter indicates the status of rough road detection during a misfire condition. The scan tool will display YES when the control module has received rough road information from another module during a misfire event. The scan tool will display NO when the control module has detected a misfire, and there is no rough road indication from another controller.

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.

Moderate Brake Apply Signal: This parameter indicates the status of the moderate brake applied switch as determined by the control module. The scan tool will display applied when the brake pedal is depressed. The scan tool will display released when the brake pedal is not depressed.

PNP Switch: This parameter indicates the range selection of the automatic transmission as calculated by the control module based on input from the PNP switch. The scan tool will display, In Gear, Park, or Neutral depending on the PNP switch position.

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.

Reduced Engine Power: This parameter indicates if the control module has detected that a throttle actuator control (TAC) system fault has occurred. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation. The control module limits engine power when this mode is Active.

Reference Voltage 1 Signal: This parameter displays the voltage on the reference 1 circuit as measured by the control module. The scan tool will display a higher value when the voltage is higher. the scan tool will display a lower value when the voltage is lower.

Reference Voltage 2 Signal: This parameter displays the voltage on the reference 2 circuit as measured by the control module. The scan tool will display a higher value when the voltage is higher. the scan tool will display a lower value when the voltage is lower.

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 Circuit Status: This parameter displays the diagnostic state of the output driver for the starter enable relay control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

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.

Stoplamp Pedal Switch: This parameter displays the state of the brake pedal as determined by the stoplamp pedal switch. This switch turns on the stop lamps when the brake pedal is depressed. The scan tool will display Applied when the brake pedal is depressed, and Released when the brake pedal is not depressed.

TAC Motor Command: This parameter indicates the required duty cycle to maintain a desired throttle position. The scan tool will display a higher value if more effort is required to move the throttle to the desired position, such as physical resistance. The scan tool will display a lower value if less effort is required to move the throttle to the desired position.

TAC Direction: This parameter displays the commanded direction of the throttle blade by the TAC system. The scan tool will display CLOSED when the throttle is being commanded to the closed position. The scan tool will display OPEN when the throttle is commanded to an OPEN position.

TCS Control Signal: This parameter indicates the status of the traction control system affecting the power of the engine. The scan tool will display REDUCED when the traction control system is commanding reduced power by the control module. The scan tool will display NONE when the TCS is not commanding reduced engine power.

TP Sensor 1 Learned Min.: This parameter displays the learned minimum voltage for TP sensor 1 as determined by the control module this ignition cycle.

TP Sensor 2 Learned Min.: This parameter displays the learned minimum voltage for TP sensor 2 as determined by the control module this ignition cycle.

TP Desired Angle: This parameter indicates the desired throttle angle calculated by the throttle actuator control (TAC) module as commanded by the vehicle operator. The scan tool will display a higher value when the accelerator pedal is depressed, and a lower value as the accelerator pedal is released.

TP Indicated Angle: This parameter displays the angle of the throttle plate as calculated by the control module using the signals from the throttle position sensor(s). The TP indicated angle is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is wide open.

TP Sensor 1: This parameter displays the voltage signal sent to the control module from throttle position (TP) sensor 1 of the throttle assembly. The TP sensor 1 is a range of values indicating a low voltage when the throttle is closed to a high voltage when the throttle plate is fully open.

TP Sensor 1: This parameter displays the angle of the throttle position (TP) sensor 1 as calculated by the control module using the signal from the TP sensor 1. The TP sensor 1 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open.

TP Sensor 2: This parameter displays the voltage signal sent to the control module from throttle position (TP) sensor 2 of the throttle assembly. The TP sensor 2 is a range of values indicating a high voltage when the throttle is closed to a low voltage when the throttle plate is fully open.

TP Sensor 2: This parameter displays the angle of the throttle position (TP) sensor 2 as calculated by the control module using the signal from the TP sensor 2. The TP sensor 2 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open.

TWC Temperature Calculated: This parameter indicates the calculated temperature of the two way converter (TWC) by the control module. The scan tool will display a high value at high temperatures. The scan tool will display a low value at lower temperatures.

Vehicle Security Status: This parameter displays the current status of the fuel disabling security system. The scan tool will display Fuel Continue when the security system allows fuel delivery. The scan tool will display Fuel Disable when the security system disables the fuel delivery.

Vehicle Speed Sensor: 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 Password Learn Enabled: This parameter indicates the status of the control vehicle password learn system. If the system learns the security password, the scan tool will display YES. The scan tool will display NO if the theft deterrent password is not learned by all modules.