F - V

The following scan tool data definitions describe 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.

FC Relay 1 Circuit Status: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

FC Relay 1 Command: The scan tool displays On or Off. The PCM is commanding fan control relay 1 ON when the scan tool indicates On. When the PCM commands the fan control relay 1 ON, both fans are enabled on low speed.

FC Relay 2 and 3 Circuit Status: The scan tool displays OK or Fault. 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. The PCM is commanding all three fan control relays ON when the scan tool indicates On. When all fan control relays are activated, both cooling fans are enabled on high speed.

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

Fuel Level Sensor: The scan tool displays 0-5 volts. The PCM supplies a 5-volt signal circuit to the fuel level sensor. The float inside the fuel tank is connected to a variable resistor which causes the signal voltage to change with fuel level. 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: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

Fuel Pump Relay Command: The scan tool displays On or Off. This parameter indicates the PCM commanded state of the fuel pump relay driver circuit.

Fuel Tank Pressure: The scan tool displays -32.7 to +14.0 mm Hg (-17.5 to +7.5 inch H2O). Fuel tank pressure (FTP) is used extensively for EVAP purge control and EVAP system diagnostics.

Fuel Tank Pressure: The scan tool displays 0-5 volts. Fuel tank pressure is used extensively for EVAP purge control and EVAP system diagnostics.

Fuel Trim Cell: The scan tool range is 0-9. The fuel trim cell is dependent upon the engine speed and the MAF sensor readings. A plot of RPM vs. MAF is divided into 10 cells. The fuel trim cell indicates which cell is currently active.

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.

GEN F-Terminal Signal: The scan tool displays 0-100 percent. This parameter indicates the pulse width of the voltage regulator's generator field control circuit. A high value indicates high electrical load.

GEN L-Terminal Signal Command: The scan tool displays On or Off. Off indicates that the PCM has commanded the generator control circuit Off.

HO2S 1: The scan tool range is 0-1000 mV. The HO2S bank 1 sensor 1 parameter represents the fuel control exhaust oxygen sensor output voltage. The voltage should fluctuate constantly within a range between about 50 mV, lean exhaust and 800 mV, rich exhaust while operating in Closed Loop.

HO2S 1 Heater Command: The scan tool displays On or Off. On indicates that the HO2S heater is being commanded on

HO2S Sensor 1: The scan tool displays Not Ready or Ready. Indicates the status of the fuel control exhaust oxygen sensor. The scan tool will indicate that the exhaust oxygen sensor is ready when the PCM detects a fluctuating heated oxygen sensor (HO2S) voltage sufficient to allow Closed Loop operation. This will not occur unless the exhaust oxygen sensor is warmed up.

HO2S 2: The scan tool range is 0-1000 mV. The HO2S bank 1 sensor 2 parameter is the post-catalyst exhaust oxygen sensor output voltage. Voltage should fluctuate within a range between about 50 mV, lean exhaust and 800 mV, rich exhaust while operating in Closed Loop. The post-catalyst HO2S output voltage will fluctuate slowly over a longer period of time, compared to the fuel control HO2S. This is due to the oxygen storage capability of an efficiently operating catalyst. If the voltage is fluctuating rapidly, and the catalyst is hot, low catalyst efficiency may be the cause.

IAC Position: The scan tool range is 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: The scan tool range is -39 to +140°C (-38 to 284°F). The PCM converts the resistance of the intake air temperature sensor to degrees. The PCM uses the intake air temperature (IAT) in order to adjust fuel delivery and spark timing according to incoming air density.

Ignition 1 Signal: The scan tool displays 0-25.5 volts. The ignition 1 signal represents the system voltage measured by the PCM at its ignition feed.

Ignition Mode: The scan tool displays Bypass or IC. Bypass indicates that the ignition control module (ICM) is keeping the spark advance at a fixed 10 degrees BTDC. Ignition control (IC) indicates that the PCM is going to control the spark advance.

Injector PWM: The scan tool range is 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: The scan tool range is 0-16 degrees. Knock retard indicates the amount of spark the PCM removes from the IC spark advance in response to signals from the knock sensor (KS).

Long Term FT: The scan tool displays -100 to +100 percent. The PCM derives the long term fuel trim from the short term fuel trim value. The long term fuel trim represents a long-term correction of fuel delivery. A value of 0 percent indicates that fuel delivery requires no compensation in order to maintain the PCM commanded air/fuel ratio. A negative value significantly below 0 percent indicates that the fuel system is rich and the PCM is reducing the fuel delivery, decreasing the injector pulse width. A positive value significantly greater than 0 percent indicates that a lean condition exists and the PCM compensates by adding fuel, increasing the injector pulse width. Fuel trim values at 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 0-655 g/s. Mass airflow (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 displays 0-31999 Hz. The PCM converts current draw needed by the MAF, to keep the hot wires at a constant temperature, into a frequency signal. The scan tool displays this frequency in Hertz.

MAP: The scan tool range is 10-105 kPa/0-5 volts. The manifold absolute pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, and speed changes. As intake manifold pressure increases, the intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading. The PCM uses the MAP sensor signal for the following: (1) Updating the BARO reading; (2) Enabling factor for several of the diagnostics.

MIL Circuit Status: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

MIL Command: The scan tool displays On or Off. The scan tool indicates if the PCM is commanding the malfunction indicator lamp (MIL) ON.

Mileage Since DTC Cleared: The scan tool displays Km or Miles. This parameter indicates the mileage accumulated since an emissions diagnostic trouble code cleared. The PCM stores this information in the Freeze Frame/Failure Records memory.

Misfire Current Cyl. #1-Misfire Current Cyl. #6: The scan tool range is 0-255 counts. The Misfire Current counters increment at a rate according to the number of possible misfires the PCM detects 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 Cyl. #1-Misfire History Cyl. #6: The scan tool range is 0-65535 counts. 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.

Number of DTCs: The scan tool displays the number of DTCs set and stored in the PCM memory.

O2 Heater Current: 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 operating temperature is reached. Initial current draw is slightly higher.

PCM Reset: The scan tool displays Yes or No. This parameter indicates when the PCM resets. The scan tool displays yes when an internal PCM reset occurred. The scan tool displays no under normal operating conditions.

PCM / VCM in VTD Fail Enable: The scan tool displays Yes or No. If the BCM and PCM lose communications with each other after sending the correct password, the PCM will enable a VTD Fail-Enable mode. This allows the driver to restart the vehicle on future ignition cycles until the communications between the BCM and PCM are restored. The scan tool displays no under normal operating conditions.

Power Enrichment: The scan tool displays Active or Inactive. Active 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 to prevent a possible sag or hesitation from occurring during acceleration.

Reduced Engine Power: The scan tool displays Active or Inactive. The PCM has the ability to disable 3 injectors during an engine over temperature condition. The engine enters this mode of operation if the ECT reaches 131°C (268°F). This protection mode permits the PCM to alternate between groups of 3 cylinders, thereby reducing engine temperature. On indicates that the engine is operating in the alternating 3 cylinder mode.

Short Term FT: The scan tool displays -100 to +100 percent. The short term fuel trim 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 mainly remains less than 450 mV, indicating a lean air/fuel mixture, short term fuel trim increases into the positive range above 0 percent. The PCM adds fuel. If the oxygen sensor voltage stays mainly above the threshold, the short term fuel trim decreases below 0 percent into the negative range. The PCM reduces the fuel delivery in order to compensate for the indicated rich condition. Under certain conditions such as an extended idle and a high ambient temperature, the canister purge may cause the short term fuel trim to read in the negative range during normal operation. The 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 amount of spark advance the PCM is commanding. The PCM computes spark advance using coolant temperature, RPM, engine load, vehicle speed, and requests for timing retard, from the KS system, TCS etc. The PCM controls the timing and sequencing of the ignition system.

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 to determine if the last startup 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 (IAT) at the time that the vehicle was started. Used by the HO2S diagnostic to determine if the last startup was a cold start.

Starter Enable Relay Circuit Status: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

Starter Relay Command: The scan tool displays On or Off. Off indicates that the PCM is not allowing starter operation due to the engine running, excessive cranking time, trans not in P/N or other factors.

Tachometer Circuit Status: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

TCC Brake Pedal Switch: The scan tool displays Applied or Released. This parameter indicates the state of the torque converter clutch (TCC) brake pedal switch circuit input. Open indicates 0 voltage input, TCC brake pedal switch open, brake pedal applied. Closed indicates a B+ voltage input, TCC brake switch closed, brake pedal released. When you apply the vehicle brakes, the scan tool display shows Applied. The torque converter clutch (TCC) and cruise control disengages. When you release the vehicle brakes, the scan tool displays Released. This allows the cruise control to be resumed and the torque converter clutch to engage.

TCC Enable Solenoid Command: The scan tool displays On or Off. This parameter indicated the commanded state of the torque converter clutch (TCC) solenoid.

TCC PWM Solenoid Command: The scan tool displays On or Off. This parameter indicated the commanded state of the torque converter clutch (TCC) solenoid.

TCC Solenoid Circuit Status: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

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

TFP Sw.: The scan tool displays Park / Neutral, Drive 1, Drive 2, Drive 3, or Drive 4. This parameter displays the selected gear of the automatic transmission.

Total Misfire Current Count: The scan tool range is 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.

TP Sensor: The scan tool displays 0-5 volts. The scan tool displays the amount of throttle opening in volts. Closed throttle displays about 1 volt and wide open throttle displays about 3.5 volts.

TP Sensor: The scan tool displays 0-100 percent. This parameter displays the amount of throttle opening in percent.

Traction Control Status: The scan tool displays Active, Allowed, Inhibited, Comm. Link Fail, Trac PWM Input or Diag. Trac. PWM. Active indicates that a traction control event is occurring. Allowed indicates that the system is ready and operational but not currently controlling traction. Inhibited indicates that system operation is not allowed due to driver input or other factors. The remaining statuses indicate various malfunctions.

TWC Temperature Calculated: The scan tool displays the calculated temperature of the three way catalyst.

Vehicle Speed Sensor: The scan tool displays km/h and mph The vehicle speed sensor (VSS) signal is converted into km/h and mph for display.

VTD Auto. Learn Timer: The scan tool displays Active or Inactive. This parameter indicates the status of the vehicle theft deterrent system password learn.

VTD Fuel Disable: The scan tool displays Active or Inactive. If the PCM has not received the correct password from the body control module (BCM), the PCM will disable the fuel system, and Active will be displayed on the scan tool. The scan tool displays Inactive under normal running conditions.

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. With the ignition off the scan tool displays no.