Scan Tool Data Definitions Part 2
Part 2Loop Status: Display shows OPEN LOOP or CLOSED LOOP. Closed Loop displayed indicates that the PCM is controlling fuel delivery according to oxygen sensor voltage. In Open Loop, the PCM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on other input sensors. Closed Loop operation should begin when the oxygen sensor becomes active, engine coolant temperature exceeds 5°C (41°F) for more than 30 seconds and the PCM has seen a RPM of 1200 or greater for 10 seconds. At extremely high ambient temperatures or when towing a trailer, it is possible for the system to remain in Open Loop operation to control catalytic converter temperatures.
Long Term FT Bank 1: Display shows counts from 0 to 255 and percentage from -100% to 99%. The normal position for the long term fuel trim is 128 counts or 0%. The long term fuel trim is based on short term fuel trim learned values. It is stored in memory blocks of the long term memory according to MAP and RPM values. A count greater than 128 or a percentage greater than 0% indicates that time is being added to the injector pulse width, increasing the amount of fuel to the engine. A count less than 128 or a percentage less than 0% indicates time is being subtracted from the injector pulse width, reducing the amount fuel to the engine.
Long Term Fr Bn 2: Display shows counts from 0 to 255 and percentage from -100% to 99%. The normal position for the long term fuel trim is 128 counts or 0%. The long term fuel trim is based on short term fuel trim learned values. It is stored in memory blocks of the long term memory according to MAP and RPM values. A count greater than 128 or a percentage greater than 0% indicates that time is being added to the injector pulse width, increasing the amount of fuel to the engine. A count less than 128 or a percentage less than 0% indicates time is being subtracted from the injector pulse width, reducing the amount fuel to the engine.
L/R Switch Bank 1 Sen. 1: Display shows counts from 0 to 65535. This displays the number of counts when the HO2S voltage swings above the rich mean threshold.
L/R Switch Bank 2 Sen. 1: Display shows counts from 0 to 65535. This displays the number of counts when the HO2S voltage swings above the rich mean threshold.
L/R Transition Time Bn 1 Sen. 1: Display shows time in milliseconds from 0.0 to 3187.5 ms. Display is the time for the HO2S voltage to change from the lean threshold to the rich threshold.
L/R Transition Bn 2 Sen. 1: Display shows time in milliseconds from 0.0 to 3187.5 ms. Display is the time for the HO2S voltage to change from the lean threshold to the rich threshold.
MAF: Display shows the amount of airflow entering the engine in grams per second (g/s) from 0 to 655. The scan tool will display 0 gms/sec only until 4X reference pulses are received,cranking or running. The PCM updates the MAF sensor display only after 4X reference pulses have been received during an ignition cycle. If during an ignition cycle the vehicle were to stall the MAF display would indicate the last airflow reading obtained while 4X reference pulses were present. If no airflow is monitored by the PCM while the vehicle is running the MAF display will default to 1.2 grams per second.
MAF Frequency: Display shows the amount of air passing the MAF sensor and entering the engine. This display indicates the airflow measured in frequency. The frequency value is converted by the PCM to grams per second.
MAP: Display shows manifold pressure in Kilo Pascals (Kpa) from 10 to 105. At key ON,engine not running, the MAP value will reflect barometric pressure.To check for an accurate MAP reading multiply your local barometric pressure by 3.386 to obtain a map value that should be within 2 Kpa of displayed value at key ON, engine not running.
MIL: Display shows ON or OFF. The MIL (Service Engine Soon) is controlled by the PCM and is used to indicate that the PCM has detected a problem that affects vehicle emissions, driveabilitv or could cause powertrain damage.
MIL Driver: Display shows OK, Open/Short, Over Current. The PCM monitors output driver (0DM) A output #1 for an open or shorted condition if one of the conditions exists the fault line will go low. The scan tool will display the condition that is present.
Misfire Current #1 (thru) #8: Display shows Misfire Current counters increment at a rate according to the number of possible misfires being detected on each cylinder during the last 200 cylinder firing events. The counters may normally display some activity, but the activity should be nearly equal for all the cylinders.
Misfire History #1 (thru) #8: Display shows counts from 0 to 65535. The Misfire History counters display the total level of misfire that has been detected on each cylinder. The Misfire History counters will not update or show any activity until a misfire, DTC P0300, has become active. The Misfire History counters will update every 200 cylinder firing events.
Misfire Cycle Delay Counter: Display shows counts from 0 to 255. If the misfire test is interrupted, due to the vehicle coming outside the test conditions for P0300, this display will show the number of engine cycles left before the test is re-enabled and data collection will resume.
Non-Driven Wheel Speed: Display shows MPH I km/h from 0 to 158 MPH, 0 to 255 km/h. This display is the non-drive (rear) wheel speed sent to the EBTCM, used for traction control and Anti-Lock braking and is monitored by the PCM. Number of Failed Emission Misfire Tests out of Last 16: The display shows a value of 0 to 16.
Odometer: Display shows miles from 0 to 1677722. This display is the actual vehicle miles stored in the PCM.
Outside Air Temp: Display shown -40°C (-40°F) to 102°C (215°F).This is the outside temperature sent from the HVAC to the PCM across the data link.
Passkey Fuel: Display shows Enabled or Inhibited. This display is a input from the Pass-Key II module that tells the PCM to enable the injectors if the proper signal is received. The scan tool will normally display Enabled. lithe Pass-Key test has failed, the display will switch to Inhibited and the fuel system may be disabled.
Passkey Input: Display shows Enabled or Disabled and 0.0 to 984.6 ms. Scan tool will display Enabled after the Passkey II module has read the ignition key code and is allowing vehicle operation. Disabled will be shown if a system fault is detected.
Passkey Starter: Display shows Enabled/ Disabled. The display indicates whether or not the PCM is allowing starter operation. The PCM disables the starter several seconds after the engine is started in order to prevent starter and flywheel damage. The PCM grounds the starter disable circuit to the Passkey II (R) module. The Passkey II (R) module will then inhibit starter operation at the Starter Inhibit relay.
PNP: Display shows P-N - or -R-OD21. P-N displayed indicates the gear select lever is in Park or Neutral. -R-0D21 displayed indicates the gear select lever is in Reverse, Drive, or Low Range.
Power Enrichment: Display shows Inactive or Active. The scan tool indicates when Power Enrichment mode is active, moderate to heavy acceleration.
PSP Switch: Display shows Normal or Hi Press. The PCM compensates engine idle depending on steering load condition. Scan tool will display Hi Press. due to increase of power steering fluid pressure while turning the steering wheel. Scan tool displays Normal under no load condition.
Ref. Volts Low: Display shows Ignition Ground Voltage in volts. The PCM keeps the voltage difference between ignition ground and PCM ground shifted by approximately 2.5 volts. The scan tool rescales the 2.5 volts to indicate 0 volts on the display. A circuit reading of 2.500 volts means the ignition and the PCM grounds are at the same level which would be displayed as 0 volts on the scan tool. A circuit reading of 1.000 volt means the ignition ground voltage is 1.5 volts lower than the PCM ground. A circuit reading of 3.500 volts means the ignition ground voltage is 1.0 volt above the PCM ground.
R/L Status Bank 1 Sen 1: Display shows HO2S bank 1 sensor 1 RICH or LEAN which indicates whether oxygen sensor voltage is above, rich, or below, lean, bias voltage. Display should change constantly, indicating that the PCM is controlling bank 1 air/fuel mixture.
R/L Status Bank 1 Sen 3: Display shows Rich or Lean. This represents the POST HO2S in the catalyst monitor (located downstream of the catalyst). Display should change much slower when compared to the Bank 1 and Bank 2 fuel control sensors indicating the catalyst is operating efficiently.
R/L Status Bank 2 Sen 1: Display shows HO2S bank 2 sensor 1 RICH or LEAN which indicates whether oxygen sensor voltage is above, rich, or below, lean, bias voltage. Display should change constantly, indicating that the PCM is controlling bank 2 air/fuel mixture.
R/L Transition Bn 1 Sen. 1: Display shows time in milliseconds from 0.0 to 3187.5 ms. Display is the time for the HO2S voltage to change from the rich threshold to the lean threshold.
L/R Transition Bn 2 Sen. 1: Display shows time in milliseconds from 0.0 to 3187.5 ms. Display is the time for the HO2S voltage to change from the lean threshold to the rich threshold.
R/L Switch Bank 1 Sen. 1: Display shows counts from 0 to 65535. This displays the number of counts when the HO2S voltage swings below the lean mean threshold.
Rich/Lean Switch Bn 2 Sen. 1: Display shows counts from 0 to 65535. This displays the number of counts when the HO2S voltage swings below the lean mean threshold.
Service Spark Retard: Display shows degrees from 0 to 4. This displays the amount of spark retard in degrees from the base spark timing of 10 degrees before top dead center. Service Spark Retard is used to compensate for poor fuel quality or low octane fuel. It can only be adjusted with a scan tool. If the battery is disconnected the service spark retard setting will reset to zero.
Shift Mode Switch: Display shows Normal or Perf. This display shows the position of the transmission shift performance switch.
Shift Sol. 1 Driver: Display shows OK, Open/Short, Over Current. The PCM monitors output driver (0DM) #2 output #5 for an open or shorted condition if one of the conditions exists the fault line will go low. The scan tool will display the condition that is present.
Shift Sol. 2 Driver: Display shows OK, Open/Short, Over Current. The PCM monitors output driver (0DM) #2 output #6 for an open or shorted condition if one of the conditions exists the fault line will go low. The scan tool will display the condition that is present.
Shift Sol. Valve 1: Display shows shift solenoid 1 as On or Off. When the automatic transaxle is in first or fourth gear, the scan tool should display On. When the transaxle is in second or third gear, the scan tool should display Off.
Shift Sol. Valve 2: Display shows shift solenoid 2 as On or Off. When the automatic transaxle is in first or second gear, the scan tool should display On. When the transaxle is in third or fourth gear, the scan tool should display Off.
Short Term FT Bank 1: Display shows counts from 0 to 255 and percentage from -100% to 99%. The normal position for the short term fuel trim is 128 counts or 0%. A count greater than 128 or a percentage greater than 0% indicates that time is being added to the injector pulse width, increasing the amount of fuel to the engine to compensate for a lean condition sensed by the bank 1 (rear) HO2S. A count less than 128 or less than 0% indicates time is being subtracted from the injector pulse width reducing the amount of fuel to the engine to compensate for a rich condition sensed at the bank 1 (rear) HO2S.
Short Term FT Bank 2: Display shows counts from 0 to 255 and percentage from -100% to 99%. The normal position for the short term fuel trim is 128 counts or 0%. A count greater than 128 or a percentage greater than 0% indicates that time is being added to the injector pulse width, increasing the amount of fuel to the engine to compensate for a lean condition sensed by the bank 1 (rear) HO2S. A count less than 128 or less than 0% indicates time is being subtracted from the injector pulse width reducing the amount of fuel to the engine to compensate for a rich condition sensed at the bank 2 (front) HO2S.
Spark: Display shows spark advance in degrees from -90 to 90. A negative number indicates degrees of retard. This is a display of the spark advance calculation which the PCM is programming into the ignition system. The PCM computes the desired spark advance using data such as Engine Temperature, RPM, Engine Load, Vehicle Speed and Operating Mode.
TCC Enable: Display shows TCC as Disabled or Enabled. This display is the allowed state of the Torque Converter Clutch.
TCC Brake Switch: Display shows Released or Applied. This parameter indicates the state of the TCC brake switch circuit input. Released indicates a B+ voltage input, brake switch closed - brake pedal released. Applied indicates a 0 voltage input brake switch open - brake pedal applied.
TCC Duty Cycle: Display shows TCC Duty Cycle in percent from 0 to 100. This parameter is the commanded percent of ON time of the TCC solenoid. 100% represents an On, energized, commanded state. 0% represents a Off, non-energized, commanded state.
TCC Enable: Display shows TCC as Disabled or Enabled. This display is the allowed state of the Torque Converter Clutch.
TCC Slip Speed: Display shows TCC Slip Speed in RPM from -4096 to 4064. Display shows the amount of slip between the engine and transaxle input shaft.
TCC Solenoid Driver: Display shows OK, Open/Short, Over Current. The PCM monitors output driver (0DM) #2 output #7 for an open or shorted condition if one of the conditions exists the fault line will go low. The scan tool will display the condition that is present.
TCM Calibration ID.: The display shows the engineering part number for the calibration software that is flashed into the PCM.
TCM Software ID: The display shows the engineering part number for the software that is flashed into the PCM.
Trans. Fluid Temp: Display shows -40°C (-40°F) to 215°C (419°F).This is the Transaxle fluid temperature in degrees.
Trans. Range or TFP Switch: Display shows Drive 1, Drive 2, Drive 3, Drive 4, Reverse, P/N, or Invalid. This is the decoded manual valve position from the transaxle range pressure switch.
Trans Range A/B/C or TFP Switch A/B/C: Display shows ON/OFF or High or Low. This shows the state of the three outputs from the transaxle range pressure switch which is used to indicate the actual manual valve position. ON or High = open circuit, OFF or Low = grounded circuit.
Throttle at Idle: Display shows No or Yes. This display indicates whether the TP Angle being monitored by the PCM is at 0 percent when the throttle is closed.
Total Misfire Failures Since First Fail: Display shows counts from 0 to 65535. The Misfire Failure counter shows the relative number of failed misfire tests since P0300 went active.
Total Misfire Passes Since First Fail: Display shows counts from 0 to 65535. The Misfire Passes counter shows the relative number of passed misfire tests since P0300 went active.
TP Angle: Display shows throttle angle in percent. Display is computed by the PCM from TP Sensor voltage. Display should read 0% at idle, 100% at wide open throttle (WOT).
TP Normalized: Display shows percent and degrees from 0 to 100 percent and 0.0 to 81.6 degrees. The PCM will compensate for deposits in the throttle body by learning the closed throttle position as zero percent and zero degrees.
TP Sensor: Display shows the amount of throttle opening in volts, with closed throttle near 0 volts and wide open throttle above 4.0 volts.
TP Sensor Learned Corr.: Display shows a value from -6.5 to +6.5 degrees. This display indicates the amount the TP sensor has been corrected to obtain the TP Normalized value of 0 degrees. The TP sensor is not physically adjustable. In order to compensate for manufacturing tolerances and also for throttle body bore deposit buildup the PCM will adjust the TP Normalized value using this correction factor. At key ON the PCM will slightly decrease this value in order to ensure that the throttle is at rest. If the throttle is at rest the slight decrease will be learned out. Refer to the TP Sensor Learned Closed Throttle Angle (DTC P1524) for TP learn description. When DTC P1524 fails this value is set to 0 degrees.
Traction Control: Display shows Inactive or Active. Display will show Active if the PCM receives a signal from the Electronic Brake and Traction Control Module, EBTCM, requesting torque reduction during a traction control maneuver.
Traction Control Torque: Display shows percent from 0 to 100. This is the calculated torque output from the engine to the transaxle used by the EBTCM for traction control system operation.
Trans. Oil Life: Display shows Transaxle Oil Life in percent from 0 to 100. This display represents the Transaxle Oil Life Index that is calculated and maintained by the PCM.
TWC Stage 1 Started: The display shows No or Yes. This display indicates that the first air/fuel transition of the idle catalyst test (P0420) is in progess.
TWC Stage 2 Started: The display shows No or Yes. This display indicates that the second air/fuel transition of the idle catalyst test (P0420) is in progess.
TWC Test Enabled: The display shows No or Yes. This display indicates the Idle Catalyst Test (P0420) has started to run. There is a 5 second delay between the TWC Test Initialization Conditions Met and the idle catalyst test being enabled.
TWC Test Initialization Conditions Met: Display shows No or Yes. This display says that the idle conditions required to test the catalyst are met.
Vehicle Speed: Display shows vehicle speed in mph and km/h from 0 to 159 mph (0 to 255 km/h). The vehicle speed is converted into mph and km/h for display.
Vehicle Speed Driver: Display shows OK, Open/Short, Over Current. The PCM monitors output driver (0DM) A output #2 for an open or shorted condition if one of the conditions exists the fault line will go low. The scan tool will display the condition that is present.