4WD - F

The Engine Scan Tool Data Definitions contains a brief description of all engine related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.

4WD Signal: The scan tool displays Enabled or Disabled. The transfer case should be in 4 wheel drive (4WD) when the scan tool displays Enabled.

4WD Low Signal: The scan tool displays Enabled or Disabled. The transfer case should be in 4WD low when the scan tool displays Enabled.

A/C Clutch Feedback Signal: The scan tool displays Yes or No. This parameter displays the signal received from the A/C clutch to the powertrain control module (PCM) to indicate the A/C clutch is ON or OFF.

A/C Compressor Cycling Switch: The scan tool displays Open or Closed. This parameter displays the state of the A/C compressor cycling switch. The A/C compressor cycling switch is a normally closed switch.

A/C Relay Command: The scan tool displays ON or OFF. This parameter displays the PCM commanded state of the A/C clutch control relay. When the scan tool displays ON, the A/C clutch should be engaged.

A/C Sec. High Press. Switch: The scan tool displays Open or Closed. This parameter displays the state of the A/C secondary high pressure switch. The A/C secondary high pressure switch is normally open.

A/C Request: The scan tool displays Yes or No. The A/C Request displays the state of the A/C request input circuit from the heating, ventilation, and air conditioning (HVAC) controls. The PCM uses the A/C request signal in order to determine whether the A/C compressor operation is being requested.

Air Fuel Ratio: The scan tool displays the ratio of the air to fuel. A typical ratio is about 14.7:1.

AIR Pump Relay Command: The scan tool displays ON or OFF. The scan tool displays ON when the PCM grounds the secondary air injection (AIR) pump relay control circuit. The scan tool displays OFF when the PCM disables the ground circuit.

APP Average: The scan tool displays 0-125 counts. The throttle actuator control (TAC) module takes the voltages from the 3 accelerator pedal position (APP) sensors, averages the readings and converts the readings into counts. The scan tool displays the average. The average is different on every vehicle.

APP Indicated Angle: The scan tool displays 0-100 percent. The scan tool displays the accelerator pedal position (APP) in percentage. When the APP is at rest, the display shows 0 percent. When the APP is fully depressed, the display shows 100 percent.

APP Sensor 1: The scan tool displays 0-5 volts. When the accelerator pedal is at 0 percent, pedal at rest, the display shows less than 1.1 volt. When the accelerator pedal is at 100 percent, pedal fully depressed, the display shows more than 2.0 volts.

APP Sensor 2: The scan tool displays 5-0 volts. When the accelerator pedal is at 0 percent, pedal at rest, the display shows more than 3.9 volts. When the accelerator pedal is at 100 percent, pedal fully depressed, display shows less than 3.0 volt.

APP Sensor 3: The scan tool displays 5-0 volts. When the accelerator pedal is at 0 percent, pedal at rest, display shows more than 3.2 volts. When the accelerator pedal is at 100 percent, pedal fully depressed, display shows less than 3.5 volts.

APP Sensor 1 Angle: The scan tool displays 0-100 percent. When the accelerator pedal is at rest, display shows 0 percent. When the accelerator pedal is fully depressed, display shows 100 percent. This percentage indicates to the TAC module the actual pedal position.

APP Sensor 2 Angle: The scan tool displays 0-100 percent. When the accelerator pedal is at rest, display shows 0 percent. When the accelerator pedal is fully depressed, display shows 100 percent. This percentage indicates to the TAC module the actual pedal position

APP Sensor 3 Angle: The scan tool displays 0-100 percent. When the accelerator pedal is at rest, display shows 0 percent. When the accelerator pedal is fully depressed, display shows 100 percent. This percentage indicates to the TAC module the actual pedal position.

APP Sensor 1 Out of Range: The scan tool displays Yes or No. If the APP sensor voltage is not within the specifications, the scan tool displays YES. If the APP sensor voltage is within the specifications, the scan tool displays No.

APP Sensor 2 Out of Range: The scan tool displays Yes or No. If the APP sensor voltage is not within the specifications, the scan tool displays YES. If the APP sensor voltage is within the specifications, the scan tool displays No.

APP Sensor 3 Out of Range: The scan tool displays Yes or No. If the APP sensor voltage is not within the specifications, the scan tool displays YES. If the APP sensor voltage is within the specifications, the scan tool displays No.

APP Sen. 1 and APP Sen. 2 Disagree: The scan tool displays Yes or No. When the TAC module receives a signal voltage from APP sensor 1 not in proper relationship to APP sensor 2, the scan tool displays YES. The scan tool displays NO under the normal operating conditions.

APP Sen. 1 and APP Sen. 3 Disagree: The scan tool displays Yes or No. When the TAC module receives a signal voltage from APP sensor 1 not in proper relationship to APP sensor 3, the scan tool displays YES. The scan tool displays NO under the normal operating conditions.

APP Sen. 2 and APP Sen. 3 Disagree: The scan tool displays Yes or No. When the TAC module receives a signal voltage from APP sensor 2 not in proper relationship to APP sensor 3, the scan tool displays YES. The scan tool displays NO under the normal operating conditions.

BARO: The scan tool displays a range of 10-105 kPa and 0.00-5.00 volts. The barometric pressure (BARO) reading is determined from the manifold absolute pressure (MAP) sensor signal. The PCM monitors the MAP signal during key up or wide-open throttle (WOT) conditions. The BARO compensates for altitude differences.

Brake Pedal Switch: The scan tool displays Applied or Release. This parameter displays the state of the brake pedal.

Clutch Pedal Switch: The scan tool displays Depressed or Released. The scan tool displays Depressed when you apply the vehicle clutch. The scan tool displays Released when you release the clutch pedal.

CMP Sensor - High to Low: The scan tool displays 0-65,535 counts. The counts increment as the PCM detects the camshaft position (CMP) sensor signal voltage going from high to low.

CMP Sensor - Low to High: The scan tool displays 0-65,535 counts. The counts increment as the PCM detects the CMP signal voltage going from low to high.

Coolant Level Switch: The scan tool displays Yes or No. This parameter indicates when the engine coolant level is low. The scan tool displays Yes when the PCM detects the engine coolant level is low.

Cruise On/Off Switch: The scan tool displays On or Off. When you activate the cruise control switch, the scan tool displays ON. The switch, when in the ON position, sends a signal voltage to the TAC module. This allows all other functions of the cruise control. When you turn OFF the cruise control switch, the scan tool displays OFF.

Cruise Resume/Accel: The scan tool displays On or Off. When the cruise control switch is in the ON position and the Resume/Accel switch is activated, the scan tool displays ON. When the Resume/Accel switch is released the scan tool displays OFF.

Cruise Set/Coast: The scan tool displays On or Off. When the cruise control switch is in the ON position and the Set/Coast switch is activated, the scan tool displays ON. When the Set/Coast switch is released the scan tool displays OFF.

Current Gear: The scan tool displays 0-4. The scan tool displays which gear the transmission is in. An illegal transmission position displays 9.

Cycles of Misfire Data: The scan tool displays a range of 0-100. The PCM counts the number of misfire tests during 200 engine revolutions.

Desired EGR Position: The scan tool displays 0-100 percent. This parameter displays the desired position of the exhaust gas recirculation (EGR) pintle as requested by the PCM. This parameter should be very close to Actual EGR position.

Desired EGR Position: The scan tool displays 0-5.0 volts. The commanded EGR is the EGR pintle position commanded by the PCM.

Desired Idle Speed: The scan tool displays a range of 0-3,187 RPM. The PCM commands the desired idle speed. The PCM compensates for various engine loads based on engine coolant temperature (ECT) in order to keep the engine at the desired speed.

DTC Set This Ignition: The scan tool displays Yes or No. This parameter indicates if a diagnostic trouble code (DTC) set during the current ignition cycle.

ECT Sensor: The scan tool displays' a range of -39 to +140°C (-38 to +284°F). The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold, internal resistance high, the PCM senses a high signal voltage and interprets the voltage as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.

EGR Learned Minimum POS: The scan tool displays 0-5.0 volts. This display represents the voltage that the PCM uses in order to determine whether or not the EGR valve is closed. The voltage displayed will be the closed position of the EGR pintle learned by the PCM.

EGR Position Sensor: The scan tool displays 0-5.0 volts. This parameter displays the actual EGR pintle position in voltage.

EGR Position Sensor: The scan tool displays a range of 0-100 percent. The PCM supplies a pulse width modulated (PWM) duty cycle to control the EGR valve. 0 percent indicates no EGR flow. 100 percent indicates full EGR flow.

Engine Load: The scan tool displays a range of 0-100 percent. The PCM calculates the engine load from engine speed and mass air flow (MAF) sensor readings. The engine load increases with an increase in RPM or airflow.

Engine Oil Level Switch: The scar tool displays Yes or No. This parameter indicates when the engine oil level is low. The scan tool displays Yes when the PCM detects the engine oil level is low.

Engine Oil Life Remaining: The scan tool displays 0-100 percent. This display represents the engine oil life index that is calculated and maintained by the PCM.

Engine Run Time: The scan tool displays Hours, Minutes, Seconds. This displays the amount of engine run time for the current ignition cycle. When you cycle the ignition OFF, the timer resets to zero.

Engine Speed: The scan tool displays a range of 0-10,000 RPM. The PCM computes engine speed from the ignition reference pulses. The engine speed should remain close to desired idle under various engine loads with the engine idling.

EVAP Canister Purge Solenoid Command: The scan tool displays a range of 0-100 percent. The PCM supplies a PWM duty cycle to control the evaporative emission (EVAP) purge solenoid valve. 0 percent indicates no purge. 100 percent indicates full purge.

EVAP Vent Solenoid Command: The scan tool displays Venting or Not Venting. The EVAP canister vent valve is normally open. The PCM commands the EVAP canister vent valve closed, during testing of the EVAP system.

EVAP Test Result: The scan tool displays if the EVAP test has passed or failed. The scan tool displays pass when the PCM determines that the EVAP diagnostic has passed. The scan tool displays fail when the PCM determines that the EVAP diagnostic has failed.

Fail Counter: The scan tool displays the number of times that a diagnostic has failed.

Fuel Level Sensor: The scan tool displays 0-5.00 volts. The scan tool displays below 1.0 volt for an empty tank, and close to 2.5 volts for a full tank.

Fuel Tank Level Remaining: The scan tool displays in liters or gallons the amount of fuel remaining in the fuel tank.

Fuel Tank Level Remaining: The scan tool displays 0-100 percent. The scan tool displays in percentage the amount of fuel remaining in the fuel tank.

Fuel Tank Pressure: The scan tool displays in -32.7 to +13.96 mm/Hg or (-17.4 to +7.5 in H2O). This parameter indicates the pressure vacuum inside of the fuel tank. A negative value indicates a vacuum. A positive value indicates a pressure.

Fuel Tank Pressure Sensor: The scan tool displays 0-5.0 volts. The scan tool displays in voltage the pressure inside of the fuel tank.

Fuel Tank Rated Capacity: The scan tool displays the capacity of the fuel tank in liters or gallons.

Fuel Trim Cell: The scan tool displays a range of 0-23. The PCM determines from the manifold absolute pressure (MAP) and RPM inputs which fuel trim cell to operate the engine in. The fuel trim cell displayed on the scan tool is the cell that the engine is operating under.

Fuel Trim Learn: The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim corrections, the scan tool displays Enabled. This indicates that the long term fuel trim is responding to the short term fuel trim. If the scan tool displays Disabled, then long term fuel trim will not respond to changes in short term fuel trim.