Scan Tool Data Definitions - Powertrain Systems

3X Crank Sensor: Scan Tool Range-0-9999 RPM. Displays engine speed.

24X Crank Sensor: Scan Tool Range-0 to approximately 1600 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.

A/C High Side Pressure Sensor: Scan Tool Displays-0-459 kPa. 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 PCM uses this information to adjust idle and to control the cooling fans.

A/C Pressure Disable: Scan Tool Displays-YES or NO. YES displayed indicates that the 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: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

A/C Relay Command: Scan Tool Displays-ON or OFF. Represents the 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.

Air Fuel Ratio: Scan Tool Range-0.0-25.5. Air fuel ratio indicates the 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 (PE) 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: Scan Tool Range-10-105 kPa/0.00-5.00 volts.The barometric pressure (BARO) reading is determined from the manifold absolute pressure (MAP) sensor signal monitored during key up and wide-open throttle (WOT) conditions. The BARO is used to compensate for altitude differences.

CMP Sensor Signal Present: Scan Tool Displays-YES or NO. Indicates whether or not the correct CAM signal has been received by the 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: Scan Tool Displays-YES or NO. Yes is displayed when the key is in crank position.

Cruise Control Active: Scan Tool Displays-YES or NO. Represents the state of the Cruise Status Input from the cruise control module. CRUISE ENGAGED should not display YES unless the vehicle is operating in a cruise control mode.

Cruise Inhibit Reason: Scan Tool displays various terms related to cruise control operation.

Cruise Inhibit Signal Circuit Status: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

Cruise Inhibit Signal Command: 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: Scan Tool Displays-numbers 1, 2, 3, or 4. The 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: Scan Tool Range-0-99 Counts. 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: 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: Scan Tool Displays-Fault or OK. This parameter saves the state of the driver circuit for this device.

Decel Fuel Cutoff: Scan Tool Displays-ACTIVE or INACTIVE. ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in Deceleration Fuel Mode.

Desired EGR Position: Scan Tool Range-0-100 percent. Represents the exhaust gas recirculation (EGR) pintle position that the PCM is commanding. Desired EGR Position should stay close to actual EGR position.

Desired Idle Speed: Scan Tool Range-0-3187 RPM. The idle speed that is commanded by the PCM. The PCM will compensate for various engine loads based on engine coolant temperature (ECT) to keep the engine at the desired speed.

Driver Module 1 Status: Scan Tool Displays-Enabled or Disabled.This parameter indicates the state of the driver circuit for this device.

Driver Module 2 Status: Scan Tool Displays-Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

Driver Module 3 Status: Scan Tool Displays-Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

Driver Module 4 Status: Scan Tool Displays-Enabled or Disabled. This parameter indicates the state of the driver circuit for this device.

ECT Sensor: Scan Tool Range- -40 to +151°C (-40 to +304°F). The ECT sensor is mounted in the coolant stream and sends engine temperature information to the powertrain control module (PCM).

EGR Flow Test Count: Scan Tool Range-0-255. Indicates the number of EGR flow test samples collected during the current ignition cycle.

EGR Learned Minimum Position: Scan Tool Range-0.0-5.0 volts. Represents the learned voltage that the powertrain control module (PCM) uses to determine whether or not the EGR valve is fully closed, 0 percent pintle position.

EGR Position Sensor: Scan Tool Range-0-100 percent or 0.00-5.00 volts. Represents the actual position of the EGR pintle in percent. 0 percent or 0 Volts displayed indicates a fully extended pintle, EGR valve closed.

EGR Position Variance: Scan Tool Range-0-100 percent. Indicates the difference between Desired EGR Position and Actual EGR Position currently being monitored by the PCM.

EGR Solenoid Command: Scan Tool Range-0-100 percent. Represents the Commanded position of the EGR pintle in percent. 0 percent displayed indicates a fully extended pintle, EGR valve closed. This parameter should be very close to EGR position sensor.

Engine Load: Scan Tool Range-0-100 percent. Engine load is calculated by the 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: Scan Tool Displays-OK or Not OK. Indicates the oil level as determined by the engine oil level sensor.

Engine Oil Pressure Switch: Scan Tool Displays-OK or Not OK. This parameter displays whether or not sufficient engine oil pressure is present.

Engine Run Time: Scan Tool Range-00:00:00-99:99:99 Hrs:Min:Sec.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: Scan Tool Range-0-9999 RPM. Engine speed is computed by the PCM from the 3 X reference input. The engine speed 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: Scan Tool Range-0-100 percent. Represents the PCM commanded PWM duty cycle of the EVAP purge solenoid valve. 0 percent displayed indicates no purge. 100 percent displayed indicates full purge.

Evap Test Abort Reason: 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: Scan Tool Displays-No Results, Passed, Aborted, Fail DTC P0440, Fail DTC P0442, Fail DTC P0446, Fail DTC P1441. This information can be used to check system operation. Operate the vehicle within the conditions required to enable the diagnostic. Refer to the EVAP DTCs supporting text. This parameter displays the results of the EVAP system diagnostic tests.

EVAP Test State: Scan Tool Displays-Test Completed, Test Running, Wait for Purge. Indicates the current status of the EVAP diagnostic routine.

EVAP Vent Solenoid Circuit Status: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

EVAP Vent Solenoid Command: Scan Tool Displays-Venting or Not Venting. This parameter indicates the commanded state of the driver circuit for this device.

FC Relay 1 Circuit Status: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

FC Relay 1 Command: If applicable, Scan Tool Displays-ON or OFF. Represents the PCM commanded state of the low speed and high speed fan relay drivers.

FC Relay 2 and 3 Circuit Status: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

FC Relay 2 and 3 Command: If applicable, Scan Tool Displays-ON or OFF. Represents the PCM commanded state of the low speed and high speed fan relay drivers.

Fuel Level Sensor: Scan Tool Displays-0-5.00 Volts. The 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: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

Fuel Pump Relay Circuit History Status: 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 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 in of H2O. Fuel tank pressure is used extensively for EVAP purge control and EVAP system diagnostics.

Fuel Trim Cell: Scan Tool displays-cell#. Fuel trim cell is dependent upon engine speed and 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 ENABLED. This indicates that the long term fuel trim is responding to short term fuel trim. If the Fuel Trim Learn displays DISABLED, 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 PCM has commanded the generator OFF.

HO2S 1: Scan Tool Range-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.

HO2S 2: Scan Tool Range-0-1132 mV. Represents the catalyst monitor exhaust oxygen sensor (O2S) output voltage. If the catalyst is operating efficiently, the heated oxygen sensor (HO2S) 1 signal will be far more active than that produced by the HO2S 2 sensor.

HO2S 1 Heater Command: Scan Tool Displays-ON or OFF. Displays the PCM commanded state of the O2S heater.

IAC Position: Range-0-255 Counts. Displays the commanded position of the idle air control pintle in counts. A larger number of counts means that more air is being commanded through the idle air passage. Idle air control (IAC) position should respond fairly quickly to changes in engine load to maintain desired idle RPM.

IAT Sensor: Scan Tool Range- -40 to +151°C (-40 to +304°F) The PCM converts the resistance of the intake air temperature sensor to degrees.

Ignition 1 Signal: Scan Tool Displays-0-25.5 Volts. The Ignition 1 represents the system voltage measured by the PCM at its ignition feed.

Ignition Mode: Scan Tool displays-Bypass/IC. Bypass indicates the ignition control module (ICM) is keeping the spark advance at a fixed 10 degrees before top dead center (BTDC).Ignition control (IC) indicates that the PCM has signaled the ICM that the PCM is going to control the spark advance.

Injector PWM: Scan Tool Range-0-1000 ms. Indicates the amount of time the PCM is commanding each injector ON during each engine cycle. A longer injector pulse width will cause more fuel to be delivered. Injector pulse width should increase with increased engine load.

Knock Retard: Scan Tool Range-0.0-25.5 degrees. Indicates the amount of timing the PCM is removing from IC spark advance in response to the signal from the knock sensors (KS).

Long Term FT: Scan Tool Range- -23 to +16 percent. Long term fuel trim is derived from the short term fuel trim value and represents a long term correction of fuel delivery. A value of 0 percent indicates that fuel delivery requires no compensation to maintain the PCM commanded air/fuel ratio. A negative value significantly below 0 percent indicates that the fuel system is rich and fuel delivery is being reduced, decreased injector pulse width. A positive value significantly more than 0 percent indicates that a lean condition exists and the PCM is compensating by adding fuel, increased injector pulse width.

Loop Status: Scan Tool Displays-OPEN or CLOSED. Closed Loop 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 throttle position (TP) sensor, engine coolant temperature (ECT), and MAF sensor inputs only.

MAF Sensor: Scan Tool Range-0.0-512 g/s. Mass air flow (MAF) is the MAF input frequency converted to grams of air per second. This indicates the amount of air entering the engine.

MAF Sensor: Scan Tool Range-0-32000 Hz. The mass air flow sensor input signal to the PCM is a frequency which varies from around 3000 Hz at idle to above 7000 Hz at WOT. The PCM converts this frequency signal to grams per second to be displayed as MAF.

MAP Sensor: Scan Tool Range- 10-105 kPa (0.00-4.97 volts). The manifold absolute pressure (MAP) sensor measures the intake manifold pressure.

MIL Circuit Status: Scan Tool Displays-Fault or OK. This parameter indicates the state of the driver circuit for this device.

MIL Command: Scan Tool Displays-ON or OFF. Indicates the PCM commanded state of the malfunction indicator lamp (MIL).

Misfire Current Cyl #1 / Misfire Current Cyl #2 / Misfire Current Cyl #3 / Misfire Current Cyl #4 / Misfire Current Cyl #5 / Misfire Current Cyl #6: Scan Tool Range-0-198 Counts. The misfire current counters indicate the number of cylinder firing events detected as possible misfires on each cylinder during the last 200 crankshaft revolutions. The number that the counters display are twice the actual number of misfire events detected. The counters may normally display some activity, but the activity should be very low and nearly equal for all the cylinders.

Misfire History Cyl #1 / Misfire History Cyl #2 / Misfire History Cyl #3 / Misfire History Cyl #4 / Misfire History Cyl #5 / Misfire History Cyl #6: Scan Tool Range-0-65535 Counts. The misfire history counters indicate the total level of misfire that has been detected on each cylinder. The number that the counters display are twice the actual number of misfire events detected. The misfire history counters will not update or show any activity until a misfire DTC P0300 has become active. The misfire history counters will be updated every time a 200 crankshaft revolution misfire test failure is detected.

Number of DTCs: Scan Tool Displays-number. This parameter displays the quantity of active DTCs.

O2 Heater Current: Scan Tool Displays-Amps. The scan tool displays HO2S heater current in amps. This parameter displays the current draw of the HO2S 1 heater only. Typically, the HO2S heater current stabilizes at about 0.50-0.60 amps after the operating temperature is reached. Initial current draw is slightly higher.

PCM/VCM in VTD Fail Enable: Scan Tool Displays-Yes or No. If applicable, the theft deterrent fuel enable is an input from the vehicle theft deterrent (VTD) system that signals the PCM to enable the injectors and the crank relay if the proper signal is received. The scan tool will normally display No. If the vehicle theft deterrent system does not send the correct theft deterrent fuel enable signal to the PCM, the display will switch to Yes and the fuel system and starter control may be disabled. Refer to vehicle theft deterrent diagnosis for further information. Testing and Inspection

PCM Reset: Scan Tool Displays-Yes or No.This parameter indicates when the internal PCM resets. The scan tool displays YES when an internal PCM reset occurred. The scan tool displays NO under the normal operating conditions.

Power Enrichment: Scan Tool Displays- ACTIVE or INACTIVE. ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in Power Enrichment mode.

Short Term FT: Scan Tool Range- -10 to +10 percent. Short term fuel trim represents a short term correction to fuel delivery by the PCM.

Spark: Scan Tool Range- -64 to +64 degrees. Displays the spark timing being commanded by the PCM on the IC circuit. A negative (-) value indicates degrees before top dead center (BTDC) or spark advance. A positive (+) value indicates degrees after top dead center (ATDC) or spark retard.

Start-Up ECT: Scan Tool Range- -40 to +151°C (-40 to +304°F). Indicates the ECT at the time that the vehicle was started.

Start-Up IAT: Scan Tool Range- -40 to +151°C (-40 to +304°F). Indicates the intake air temperature (IAT) at the time that the vehicle was started.

TCC Brake Pedal Switch: Scan Tool Displays-RELEASED or APPLIED. This input to the PCM represents the state of the vehicle brake pedal. When the brake switch indicates that the brake pedal is APPLIED, the PCM will command the transaxle torque converter clutch (TCC) to disengage.

TCC PWM solenoid Command: Scan Tool Displays-ON or OFF. Indicates the commanded state of the transaxle TCC.

TFP Sw.: Scan Tool Displays-PARK, REVERSE, NEUTRAL, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. Trans range represents the decoded status of the four inputs from the transaxle Internal Mode Switch Assembly. The combination of transaxle inputs indicates the position of the transaxle manual valve.

TP Sensor: Scan Tool Range-0-100 percent or 0.00-5.00 volts. The voltage being monitored by the PCM on the TP sensor signal circuit.

Vehicle Speed Sensor: Scan Tool Range-0-255 km/h (0-155 mph). The vehicle speed sensor signal is converted into km/h and mph for display.

VTD Auto Learn Timer: Scan Tool Displays-ACTIVE or INACTIVE. The auto learn timer is the indication if the VTD system is in the learn mode and has not timed out.

VTD Fuel Disable: Scan Tool Displays-ACTIVE or INACTIVE. If applicable, the theft deterrent fuel enable is an input from the vehicle theft deterrent system that signals the PCM to enable the injectors and the crank relay if the proper signal is received. The scan tool will normally display INACTIVE. If the vehicle theft deterrent system does not send the correct theft deterrent fuel enable signal to the PCM, the display will switch to ACTIVE and the fuel system and starter control may be disabled. Refer to vehicle theft deterrent diagnosis for further information. Testing and Inspection

VTD Fuel Disable Until Ign. OFF: Scan Tool Displays-Yes or NO. With the ignition ON and a VTD code present, the scan tool displays Yes.