F - V

FC Relay 1 Circuit Status: Indicates the diagnostic state of the output driver for the FC Relay 1 Circuit. The scan tool displays Fault, OK or Invalid State.

FC Relay 1 Command: Indicates the commanded state of the FC Relay 1. The scan tool displays ON or OFF.

FC Relay 2 and 3 Circuit Status: Indicates the diagnostic state of the output driver for the FC Relay 2 and 3 Circuit. The scan tool displays Fault, OK or Invalid State.

FC Relay 2 and 3 Command: Indicates the commanded state of the FC Relay 2 and 3. The scan tool displays ON or OFF.

Fuel Pump Relay Circuit History Status: The scan tool displays Fault or OK This parameter displays the state of the driver circuit for this device.

Fuel Pump Relay Circuit Status: Indicates the diagnostic state of the output driver for the fuel pump relay control circuit. The scan tool displays Fault, OK or Invalid State.

Fuel Pump Relay Command: The scan tool displays ON or OFF. Indicates the PCM commanded state of the fuel pump relay control circuit.

Fuel Tank Level Remaining: Indicates the level of fuel remaining in the fuel tank. The scan tool displays percent.

Fuel Tank Pressure Sensor: The 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: The scan tool range is 0-9. 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: The scan tool displays NO or YES. When conditions are appropriate for enabling long term FT corrections, FUEL TRIM LEARN will display yes. This indicates that the long term FT is responding to short term fuel trim. If the fuel trim Learn displays NO, long term FT will not respond to changes in short term FT.

Gen F-Terminal Signal: The scan tool range is 0-100 percent. Represents the field terminal input from the generator. The field PWM duty cycle indicates generator output level. A higher duty cycle indicates a higher generator output. The PCM uses the generator F terminal signal in order to adjust spark and idle air control (IAC) to compensate for variances in engine load caused by the generator.

Gen L-Terminal Command: The scan tool displays ON or OFF. OFF displayed indicates that the PCM has commanded the generator control circuit OFF.

HO2S 1: The scan tool range is 0-1,132 mV. Represents the fuel control exhaust oxygen sensor output voltage. Should fluctuate constantly within a range between 10 mV, lean exhaust, and 1,000 mV, rich exhaust, while operating in Closed Loop.

HO2S 2: The scan tool range is 0-1,132 mV. Represents the catalyst monitor exhaust oxygen sensor 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. If the PCM detects a level of HO2S 2 activity that indicates the catalyst is no longer operating efficiently, DTC P0420 will be set.

IAC Position: The range is 0-255. This 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. IAC position should respond fairly quickly to changes in engine load to maintain desired idle RPM.

IAT Sensor: The scan tool range is -40 to +151°C (-40 to +304°F). The PCM converts the resistance of the IAT sensor to degrees. The PCM uses intake air temperature (IAT) in order to adjust fuel delivery and spark timing according to incoming air density. IAT is also compared to engine coolant temperature (ECT) at start-up to identify cold starts for the HO2S heater and the EVAP diagnostics.

Ignition 1 Signal: The scan tool range is 0-25.5 volts. Represents the system voltage measured by the PCM at the PCM ignition feed.

Ignition Mode: The scan tool displays BYPASS or IC. Indicates the commanded state of the Bypass signal output from the PCM. When BYPASS is displayed, the ignition control module (ICM) is controlling the spark advance at a fixed 10 degrees before top dead center (BTDC), bypass mode. IC displayed indicates that the PCM has requested control of the spark advance, IC mode. The ignition control module determines the correct operating mode based on the level of voltage that the PCM applies to the ignition control module bypass circuit. The PCM provides 5 volts to the ignition control module bypass circuit when conditions are appropriate for PCM control of spark timing (IC mode). If the PCM does not apply 5 volts to the bypass circuit, or if the ignition control module does not receive the voltage, the module will control spark timing.

Injector PWM: Indicates the commanded pulse width modulation of the fuel injectors. The scan tool displays milliseconds.

Knock Retard: The scan tool range is 0-25.5 degrees. Indicates the amount of spark the PCM is removing from the IC spark advance in response to the signal from the knock sensors (KS). The traction control system desired torque signal from the electronic brake and traction control module (EBTCM) may cause knock retard to display a value more than 0 degrees if traction control is active.

Long Term FT: The scan tool range is -23 to +16 percent. Long term FT is derived from the short term FT 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. Because long term fuel trim tends to follow short term FT. A value in the negative range due to canister purge at idle should not be considered unusual. The PCMs maximum authority to control long term FT allows a range between -23 to +16 percent. Fuel trim values at or near maximum authority may indicate an excessively rich or lean system.

Loop Status: The 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, and MAF sensor inputs only.

MAF Sensor: The scan tool range is 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: The scan tool range is 0-32,000 Hz. The mass air flow sensor input signal to the PCM is a frequency which varies from around 3,000 Hz at idle to above 7,000 Hz at wide open throttle (WOT). The PCM converts this frequency signal to grams per second to be displayed on the scan tool as MAF.

MAP Sensor: The scan tool range is 10-105 kPa/0.00-4.97 volts. The manifold absolute pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, EGR flow, and speed changes. As intake manifold pressure increases, intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading. The MAP sensor signal is used in order to monitor the intake manifold pressure changes during the EGR flow test, to update the BARO reading, and as an enabling factor for many of the diagnostics.

MIL Circuit Status: Indicates the diagnostic state of the output driver for the MIL circuit. The scan tool displays Fault, OK or Invalid State.

MIL Command: The scan tool displays ON or OFF. Indicates the PCM commanded state of the malfunction indicator lamp (MIL).

Misfire Current Cyl. 1-6: The scan tool range is 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. 1-6: The scan tool range is 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 DTC(s): The scan tool displays a number. This parameter displays the quantity of active DTCs.

PCM / VCM in VTD Fail Enable: The scan tool displays ACTIVE or INACTIVE. 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 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.

Power Enrichment: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in power enrichment mode. The PCM will command power enrichment mode when a large increase in throttle position and load is detected. While in power enrichment, the PCM will increase the amount of fuel delivered by entering Open Loop and increasing the injector pulse width. This is done in order to prevent a possible sag or hesitation from occurring during acceleration.

Short Term Fuel Trim: The scan tool range is -11 to +20 percent. Short term FT represents a short-term correction to fuel delivery by the PCM in response to the amount of time the fuel control oxygen sensor voltage spends above or below the 450 mV threshold. If the oxygen sensor voltage has mainly remained less than 450 mV, indicating a lean air/fuel mixture, short term FT will increase into the positive range above 0 percent and the PCM will add fuel. If the oxygen sensor voltage stays mainly above the threshold, short term fuel trim will decrease below 0 percent into the negative range while the PCM reduces fuel delivery to compensate for the indicated rich condition. Under certain conditions such as extended idle and high ambient temperatures, canister purge may cause short term FT to read in the negative range during normal operation. The PCM's maximum authority to control fuel trim allows a range between -11 and +20 percent. Fuel trim values at maximum authority may indicate an excessively rich or lean system.

Spark: The scan tool range is -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. Because the ignition control module sets spark advance at a fixed value of 10 degrees BTDC while operating in Bypass mode, the displayed spark advance only reflects true spark timing when the PCM has commanded IC mode.

Starter Enable Relay Circuit Status: Indicates the diagnostic state of the output driver for the starter enable relay control circuit. The scan tool displays Fault, OK or Invalid State.

Starter Relay Command: The scan tool displays ON or OFF. A Disabled display indicates that the PCM has inhibited starter relay operation. The PCM will inhibit starter relay operation if the engine is running, a correct VTD password has not been received from the VTD module or if the starter is engaged for an extended period of time.

Start-Up ECT: The scan tool range is -40 to +151°C (-40 to +304°F). Indicates the engine coolant temperature at the time that the vehicle was started. Used by the HO2S diagnostic in order to determine if the last start-up was a cold start.

Start-Up IAT: The scan tool range is -40 to +151°C (-40 to +304°F). Indicates the intake air temperature at the time that the vehicle was started. Used by the HO2S diagnostic in order to determine if the last start-up was a cold start.

TCC Brake Pedal Switch: Indicates the state of the switch. The scan tool displays Applied or Released.

TCC PWM Solenoid Command: Indicates the commanded PWM signal to the solenoid. The scan tool displays Hz.

TCS Circuit History: The scan tool displays Fault or OK This parameter saves the state of the driver circuit for this device.

TCS Circuit Status: Indicates the diagnostic state of the output driver for the traction control system (TCS) circuit. The scan tool displays Fault, OK or Invalid State.

TFP Switch: The scan tool displays PARK/NEUTRAL, REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. The TFP switch represents the decoded status of the four inputs from the internal transaxle fluid pressure switch assembly. The combination of these inputs indicates the position of the transaxle manual valve.

TP Sensor: The scan tool range is 0-100 percent. TP angle is computed by the PCM from the TP sensor voltage. TP angle should display 0 percent at idle and 100 percent at wide open throttle.

TP Sensor: The scan tool range is 0-5 volts. The voltage being monitored by the PCM on the TP sensor signal circuit.

Traction Control Status (If Equipped): The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the traction control system is taking action in order to reduce drive wheel slippage.

Torque Request Signal (If Equipped): The scan tool range is 0-100 percent. Represents the PWM signal from the electronic brake and traction control module. The EBTCM reduces the traction control desired torque signal pulse width when a drive wheel slippage situation is detected. The PCM monitors the traction control desired torque signal and reduces drive wheel slippage as necessary by retarding spark timing, decreasing boost solenoid PWM, or increasing air/fuel ratio. The PCM can also turn OFF up to three fuel injectors if the traction control desired torque signal indicates a large enough amount of drive wheel slippage. A problem with the traction control desired torque signal should cause DTC P1571 to set.

Torque Delivered Signal (If Equipped): The scan tool range is 0-100 percent. Represents the PWM signal which indicates the percent of available torque the engine is delivering to the drive wheels. The EBTCM monitors the traction control torque signal in order to ensure that the PCM is responding properly to the traction control desired torque signal.

Vehicle Speed: The scan tool range is 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: The scan tool displays ACTIVE or INACTIVE. The auto learn timer is the indication if the vehicle theft deterrent (VTD) system is in the learn mode and has not timed out.

VTD Fuel Disable: The 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.

VTD Fuel Disable Until Ign. OFF: The scan tool displays YES or NO With the ignition ON and a VTD code present, the scan tool displays YES.