Scan Tool Data Definitions Part 1

SCAN TOOL DATA DEFINITIONS

3X CRANK SENSOR: Scan tool range is 0-9999. Displays engine speed.

24X CRANK SENSOR: The scan tool range is 0 to approximately 1,600 RPM. Displays the engine speed calculated from the 24 X reference signal powertrain control module (PCM) input. Should nearly match ENGINE SPEED up to approximately 1,600 RPM limit.

AIR PUMP RELAY CIRCUIT STATUS: Scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

AIR PUMP RELAY COMMAND: The scan tool displays ON or OFF. This represents the powertrain control module (PCM) commanded state of the secondary air injection (AIR) pump relay driver circuit. The AIR pump should be engaged when commanded AIR pump displays ON.

AIR SOLENOID CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

AIR SOLENOID COMMAND: The scan tool displays ON or OFF. This represents the powertrain control module (PCM) commanded state of the secondary air injection (AIR) solenoid driver circuit. The AIR solenoid should be engaged when commanded AIR solenoid displays ON.

A/C HIGH SIDE PRESSURE SENSOR: The scan tool displays 0-459 kPa/Psi/Volts. This represents the A/C refrigerant pressure sensor signal. The amount of pressure indicates the amount of load that the A/C compressor is placing on the engine. The powertrain control module (PCM) uses this information to adjust idle and to control the cooling fans.

A/C OFF FOR WOT: The scan tool displays YES or NO. Yes displayed indicates that the powertrain control module (PCM) has commanded the A/C compressor clutch relay OFF because the throttle position is more than the threshold for A/C compressor operation, throttle position (TP) angle more than 90 percent.

A/C PRESSURE DISABLE: The scan tool displays YES or NO. YES displayed indicates that the powertrain control module (PCM) is monitoring an A/C refrigerant pressure signal voltage which is too high or too low to allow the A/C compressor clutch to engage.

A/C RELAY CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

A/C Relay Command: The scan tool displays ON or OFF. This represents the powertrain control module (PCM) commanded state of the A/C compressor clutch relay driver circuit. The A/C compressor clutch should be engaged when commanded A/C displays ON.

A/C REQUEST SIGNAL: The scan tool displays YES or NO. This indicates the state of the A/C request input circuit from the heating, ventilation, and air conditioning (HVAC) controls. The powertrain control module (PCM) uses the A/C request signal to determine whether A/C compressor operation is being requested.

AIR FUEL RATIO: The scan tool range is 0.0-25.5. This air fuel ratio indicates the powertrain control module (PCM) commanded value. In Closed Loop, air fuel ratio should normally be around 14.2-14.7. A lower air fuel ratio indicates a richer commanded mixture, which may be seen during Power Enrichment or three-way catalytic converter (TWC) Protection modes. A higher air fuel ratio indicates a leaner commanded mixture. This can be seen during Decel Fuel Mode.

BARO: The scan tool range is 10-105 kPa. The barometric pressure reading is determined from the manifold absolute pressure (MAP) sensor signal monitored during key up and wide open throttle (WOT) conditions. The barometric pressure is used to compensate for altitude differences.

CMP SENSOR SIGNAL PRESENT: The scan tool displays YES or NO. Indicates whether or not the correct CAM signal has been received by the powertrain control module (PCM) during the last six 3X reference pulses. NO displayed indicates no CAM signal received. A toggling display indicates an intermittent CAM signal.

CRANK REQUEST SIGNAL: The scan tool displays YES or NO. Yes is displayed when the key is in crank position.

CRUISE CONTROL ACTIVE: The scan tool displays YES or NO. This represents the state of the Cruise Status Input from the cruise control module. YES displayed indicates the vehicle is operating in a cruise control mode.

CRUISE INHIBIT REASON: The scan tool displays various terms related to cruise control operation.

CRUISE INHIBIT SIGNAL CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

CRUISE INHIBIT SIGNAL COMMAND: The Scan tool displays ON or OFF. ON displayed indicates that the powertrain control module (PCM) is commanding the cruise control module to inhibit cruise control operation. Should display ON at idle.

CURRENT GEAR: The scan tool displays numbers 1, 2, 3, or 4. The powertrain control module (PCM) looks at Trans Range position and the gear commanded by the PCM. The actual forward gear that the transaxle is in will be the lower of the two because the manual valve can override the PCM commanded gear.

CYCLES OF MISFIRE DATA: the scan tool range is 0-99 Counts. This indicates the total number of cylinder firing events that were detected as being misfires during the last 200 crankshaft revolution sample period.

CYLINDER 1 THROUGH 6 INJECTOR CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

CYLINDER 1 THROUGH 6 INJECTOR CIRCUIT HISTORY: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.

DECEL FUEL CUTOFF: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the powertrain control module (PCM) has detected conditions appropriate to operate in Deceleration Fuel Mode. The PCM will command deceleration fuel mode when a sudden decrease in throttle position has been detected while the vehicle is traveling over 40 km/h (25 mph). While in Deceleration Fuel mode, the PCM will decrease the amount of fuel delivered by entering Open Loop and decreasing the injector pulse width.

DESIRED EGR POSITION: The scan tool range is 0-100 percent. This represents the exhaust gas recirculation (EGR) pintle position that the powertrain control module (PCM) is commanding. Desired EGR Position should stay close to Actual EGR Position.

DESIRED IDLE SPEED: The scan tool range is 0-3,187 RPM. The idle speed that is commanded by the powertrain control module (PCM). The PCM will compensate for various engine loads based on engine coolant temperature to keep the engine at the desired speed.

DRIVER MODULE 1 STATUS: The scan tool displays Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

DRIVER MODULE 2 STATUS: The scan tool displays Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

DRIVER MODULE 3 STATUS: The scan tool displays Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

DRIVER MODULE 4 STATUS: The scan tool displays Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

ECT SENSOR: The scan tool range is -40°C to +151°C (-40°F to +304°F). The engine coolant temperature (ECT) sensor sends engine temperature information to the powertrain control module (PCM).

EGR FLOW TEST COUNT: The scan tool range is 0-255. This indicates the number of exhaust gas recirculation (EGR) flow test samples collected during the current ignition cycle.

EGR LEARNED MINIMUM POSITION: The Scan tool range is 0-5 volts. This represents the learned voltage that the powertrain control module (PCM) uses to determine whether or not the exhaust gas recirculation (EGR) valve is fully closed.

EGR POSITION SENSOR: The scan tool range is 0-100 percent or 0.00-5.00 volts. This represents the actual position of the exhaust gas recirculation (EGR) pintle in percent. 0 percent or 0 volts displayed indicates EGR valve closed.

EGR POSITION VARIANCE: The scan tool range is 0-100 percent. This indicates the difference between Desired EGR Position and Actual EGR Position currently being monitored by the powertrain control module (PCM).

EGR SOLENOID COMMAND: The scan tool range is 0-100 percent. Displays the pulse width modulated (BWM) duty cycle that the PCM is applying to the EGR solenoid. 0 percent indicates no EGR is commanded.

ENGINE LOAD: The scan tool range is 0-100 percent. This engine load is calculated by the powertrain control module (PCM) from engine speed and mass air flow (MAF) sensor readings. Engine load should increase with an increase in RPM or air flow.

ENGINE OIL LEVEL SWITCH: The scan tool displays OK or Not OK. This indicates the oil level as determined by the engine oil level sensor.

ENGINE OIL LIFE REMAINING: The scan tool range is 0-100 percent. This display represents the engine oil life index that is calculated and maintained by the powertrain control module (PCM).

ENGINE OIL PRESSURE SWITCH: the scan tool displays OK or Not OK. This parameter displays whether or not sufficient engine oil pressure is present.

ENGINE RUN TIME: The scan tool range is 00:00:00-99:99:99 Hrs:Min:Sec. This indicates the time elapsed since the engine was started. If the engine is stopped, ENGINE RUN TIME will be reset to 00:00:00.

ENGINE SPEED: The scan tool range is 0-9,999 RPM. This engine speed is computed by the powertrain control module (PCM) from the 3X reference input. It should remain close to desired idle under various engine loads with engine idling.

EVAP FAULT HISTORY: The scan tool displays No Fault, Excess Vacuum, Purge Valve Leak, Small Leak or Weak Vacuum. This parameter displays the result of the evaporative emission (EVAP) system diagnostic.

EVAP PURGE SOLENOID CIRCUIT STATUS: Scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

EVAP PURGE SOLENOID COMMAND: The scan tool range is 0-100 percent. This represents the powertrain control module (PCM) commanded pulse width modulation (PWM) duty cycle of the evaporative emission (EVAP) purge solenoid valve. 0 percent displayed indicates no purge. 100 percent displayed indicates full purge.

EVAP TEST ABORT REASON: The scan tool displays Not Aborted, Lost Enable, Small Leak, Vehicle Not at Rest. Provides additional information relative to the EVAP Test Result parameter.

EVAP TEST RESULT: The scan tool displays No Results, Passed, Aborted, Fail DTC P0440, Fail DTC P0442, Fail DTC P0446, Fail DTC 1441. This information can be used to check system operation. Operate the vehicle within the conditions required to enable the diagnostic Refer to the evaporative emission (EVAP) diagnostic trouble code (DTC) supporting text. This parameter displays the results of the EVAP system diagnostic tests.

EVAP TEST STATE: The scan tool displays Test Completed, Test Running, Wait for Purge. This indicates the current status of the evaporative emission (EVAP) diagnostic routine.

EVAP VENT SOLENOID CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

EVAP VENT SOLENOID COMMAND: The scan tool displays Venting or Closed. This parameter indicates the commanded state of the driver circuit for this device.

FC RELAY 1 CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

FC RELAY 1 COMMAND: The scan tool displays ON or OFF, if applicable. This represents the powertrain control module (PCM) commanded state of the low speed and high speed fan relay drivers.

FC RELAY 2 AND 3 CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

FC RELAY 2 AND 3 COMMAND: The scan tool displays ON or OFF, if applicable. This represents the powertrain control module (PCM) commanded state of the low speed and high speed fan relay drivers.

FUEL LEVEL SENSOR: The scan tool displays 0-5 volts. The powertrain control module (PCM) converts the signal voltage to a fuel level value. The scan tool displays close to 0.8 volts for an empty tank, and close to 2.5 volts for a full tank.

FUEL PUMP RELAY CIRCUIT STATUS: The scan tool displays Fault or OK. This parameter indicates the state of the driver circuit for this device.

FUEL PUMP RELAY CIRCUIT HISTORY STATUS: The scan tool displays Fault or OK. This parameter saves the state of the driver circuit for this device.

FUEL PUMP RELAY COMMAND: Scan tool displays ON or OFF. Indicates the powertrain control module (PCM) commanded state of the fuel pump relay driver circuit.

FUEL TANK LEVEL REMAINING: Scan tool displays 0-100 percent. The scan tool displays in percentage the amount of fuel remaining in the fuel tank.

FUEL TANK PRESSURE SENSOR: Scan tool displays 0-5 volts or -17.5 to +7.5 inches of H2O or mmHg. Fuel tank pressure is used extensively for evaporative emission (EVAP) purge control and EVAP system diagnostics.

FUEL TRIM CELL: Scan tool displays cell #. Fuel trim cell is dependent upon engine speed and mass air flow (MAF) sensor readings. A plot of RPM vs. MAF is divided into 10 cells. Fuel trim cell indicates which cell is currently active.

FUEL TRIM LEARN: Scan tool displays ENABLED or DISABLED. When conditions are appropriate for enabling long term fuel trim corrections, FUEL TRIM LEARN will display yes. This indicates that the long term fuel trim is responding to short term fuel trim. If the Fuel Trim Learn displays NO, long term fuel trim will not respond to changes in short term fuel trim.

GENERATOR F TERMINAL SIGNAL: Scan tool displays percent. This parameter indicates the pulse width of the voltage regulator generator field control circuit, a high value indicates a high electrical load.

GENERATOR L TERMINAL SIGNAL COMMAND: Scan tool displays ON or OFF. OFF displayed indicates that the powertrain control module (PCM) has commanded the generator OFF.

HO2S 1: Scan tool range is 0-1132 mV. Represents the fuel control exhaust oxygen sensor output voltage. Should fluctuate constantly within a range between 10 mV, lean exhaust, and 1000 mV, rich exhaust, while operating in Closed Loop.