Scan Tool Data Definitions Part 2
SCAN TOOL DATA DEFINITIONS 2GEN 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.
Genr 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 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.
IAT Sensor: This parameter displays the temperature of the air entering the engine based on the input from the intake air temperature sensor. When the air temperature is low, 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.
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 Avg. Bn1: 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 % 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 Avg. Bn2: 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 % 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 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 % 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 2. The scan tool will a high value for a large amount of long term fuel correction, and 0 % 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.
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.
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 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.
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.
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.
Reverse Inhibit Solenoid Command: This parameter displays the commanded state of the reverse inhibit solenoid control circuit by the control module. The reverse inhibit solenoid should be on when the scan tool indicates the Reverse Inhibit Solenoid Command is ON. The reverse inhibit solenoid should be off when the scan tool indicates the Reverse Inhibit Solenoid Command is OFF.