Part 3
Scan Tool Data DefinitionsShort Term FT Avg Bn 1: The scan tool displays percentage. This parameter indicates the average short term fuel trim for this bank. The scan tool will display a value higher than 0 if the time is being added to the injector pulse width, increasing the amount of fuel to that bank of the engine to compensate for a lean condition sensed by the oxygen sensors on that bank. The scan tool will display a value lower than 0 if time is being subtracted from the injector pulse width, reducing the amount of fuel to the engine to compensate for a rich condition sensed by the oxygen sensors on that bank. A value of 0 percent indicates no compensation is required to operate the engine at the desired air/fuel ratio.
Short Term FT Avg Bn 2: The scan tool displays percentage. This parameter indicates the average short term fuel trim for this bank. The scan tool will display a value higher than 0 if the time is being added to the injector pulse width, increasing the amount of fuel to that bank of the engine to compensate for a lean condition sensed by the oxygen sensors on that bank. The scan tool will display a value lower than 0 if time is being subtracted from the injector pulse width, reducing the amount of fuel to the engine to compensate for a rich condition sensed by the oxygen sensors on that bank. A value of 0 percent indicates no compensation is required to operate the engine at the desired air/fuel ratio.
Short Term FT Bank 1: The scan tool displays percentage. This parameter indicates the current short term fuel trim for this bank. The scan tool will display a value higher than 0 if the time is being added to the injector pulse width, increasing the amount of fuel to that bank of the engine to compensate for a lean condition sensed by the oxygen sensors on that bank. The scan tool will display a value lower than 0 if time is being subtracted from the injector pulse width, reducing the amount of fuel to the engine to compensate for a rich condition sensed by the oxygen sensors on that bank. A value of 0 percent indicates no compensation is required to operate the engine at the desired air/fuel ratio.
Short Term FT Bank 2: The scan tool displays percentage. This parameter indicates the current short term fuel trim for this bank. The scan tool will display a value higher than 0 if the time is being added to the injector pulse width, increasing the amount of fuel to that bank of the engine to compensate for a lean condition sensed by the oxygen sensors on that bank. The scan tool will display a value lower than 0 if time is being subtracted from the injector pulse width, reducing the amount of fuel to the engine to compensate for a rich condition sensed by the oxygen sensors on that bank. A value of 0 percent indicates no compensation is required to operate the engine at the desired air/fuel ratio.
Spark: This parameter is the desired spark advance calculated by the control module based on many sensor inputs. The scan tool will display a lower value at idle speed, and a higher value under heavy acceleration and load conditions.
Starter Relay Command: This parameter displays the commanded state of the starter relay control circuit. The scan tool will display ON or OFF. ON indicated the starter relay control circuit is being grounded by the control module, allowing voltage to the starter. OFF indicates the starter relay is not being commanded ON by the control module.
Start Up ECT: This parameter indicates the engine coolant temperature at startup, as calculated by the control module based on the input from the engine coolant temperature sensor. The scan tool will display a higher value at higher engine startup temperatures, and a lower value at lower startup temperatures.
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 air temperatures, and lower value during colder air temperatures.
TAC Forced Engine Shutdown: This parameter indicates the status of TAC control by the control module. The scan tool will display YES if the engine has been shut down due to a throttle control fault. The scan tool will display NO if the engine has not been shut down by a throttle control fault.
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.
TCC Cruise Brake Pedal Switch: This parameter displays the position of the torque converter clutch (TCC) brake pedal switch input to the control module. The scan tool displays Applies, Released, or Invalid.
TFT Sensor: The parameter displays the transmission fluid temperature sensor. Transmission fluid temperature is high, 151 °C (304 °F), when the signal voltage is low, 0 volt. Transmission fluid temperature is low, .40 °C (-40 °F), when signal voltage is high, 5 volt.
Torque Management Spark Retard: This parameter indicates how much the ignition spark timing is being retarded to control torque by the control module. The scan tool will display a higher value under extreme torque control conditions such as spinning wheels. The scan tool will display a lower value under low torque control conditions such as light driving.
Total Knock Retard: This parameter indicated how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as temperatures and anti-lock braking. The scan tool will display a lower value during lighter driving conditions.
Total Misfire: This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on all cylinders as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter.
TP Desired Angle: This parameter indicates the desired throttle angle calculated by the 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 (TP) sensor(s). The TP indicated angle is 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 TP sensor 1 or the throttle assembly. The TP sensor 1 is a range of values indicating a high voltage when the throttle is closed to a low voltage when the throttle plate fully open.
TP Sensor 1 Indicated Position: 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 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: This parameter displays the voltage signal sent to the control module from TP sensor 2 or the throttle assembly. The TP sensor 3 is a range of values indicating a high voltage when the throttle is closed to a low voltage when the throttle plate fully open.
TP Sensor 2 Indicated Position: This parameter displays the angle of the 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.
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 Sensors 1 and 2: This parameter displays the results of a control module test that compares the signals from the TP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that TP sensor 1 and TP sensor 2 voltages correspond to the same throttle position. Disagree indicates that TP sensor 1 and TP sensor 2 voltages correspond to different throttle positions.
TP Performance Test: This parameter displays the status of the TP performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.
Transmission 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.
Vehicle Speed Sensor: This parameter indicates the vehicle speed calculated by the control module based on an input from the vehicle speed sensor (VSS). The scan tool will display a high value at higher vehicle speeds, and a low value at lower vehicle speeds.
VTD Auto Learn Timer: The scan tool displays Active/Inactive. This parameter indicated if the control module is ready to learn the theft deterrent password. The scan tool will display active if the system is ready to learn. The scan tool will display inactive if the system has timed out or is not ready to learn the password.
VTD Fuel Disable: This parameter Indicates if the VTD system has received proper information to enable or disable fuel. The scan tool will display Active or Inactive. The scan tool will display Active if the control module does not receive the correct password from the PIM. The scan tool will display Inactive if the control module receives the correct password from the PIM. If the system is Active, the engine will not start.
VTD Fuel Disable Until Ign Off: The scan tool will display Yes or No. This parameter indicates if the VTD is disabled until the ignition is turned OFF. The scan tool will display Yes if the ignition is ON and a theft deterrent DTC is present. The scan tool will display off if the system is OK and the theft deterrent system is inactive.
VTD Fuel Enabled: This parameter indicates if the VTD system has received proper information to enable or disable fuel. The scan tool will display Yes or No. The scan tool will display No if the control module does not receive the correct password from the PIM. The scan tool will display Yes if the control module receives the correct password from the PIM. If the scan tool is displaying No, the engine will not start.
VTD Password Learn Enable: The scan toll displays Yes/No. The scan tool displays No until the VTD is places in learn mode, then it will display Yes.
Warm-ups Since DTC Cleared: This parameter indicates the number of warm up cycles that have occurred Since DTCs were cleared. The scan toll will display a higher counts as more warm up cycles have occurred since the DTCs were cleared.
Warm-ups w/o Emission Faults: The scan tool displays in counts. This parameter counts the number of warm up cycles without and emission fault present. The parameter increments until a fault occurs. If fault occurs, the counter reverts to 0 until the fault is corrected. Clearing information with a scan tool or loss of power to the ECM also resets the counter to 0.
Warm-ups w/o Non-Emission Faults: The scan tool displays in counts. This parameter counts the number of warm up cycles without and non-emission fault present. The parameter increments until a fault occurs. If fault occurs, the counter reverts to 0 until the fault is corrected. Clearing information with a scan tool or loss of power to the ECM also resets the counter to 0.
Wide Open Throttle: This parameter indicates the throttle status commanded by the control module. The scan tool will display Yes is the vehicle throttle is commanded to wide open. The scan tool will display No if the vehicle throttle is commanded to an amount less than 100%.