L - V

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 powertrain control module (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 powertrain control module (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 mass air flow (MAF) sensor inputs only.

Low Oil Lamp Circuit Status: The scan tool indicates the diagnostic state of the output driver for the low oil lamp control circuit. The scan tool displays Fault, OK or Invalid State.

Low Oil Lamp Command: The scan tool indicates the commanded state of the low oil lamp. The scan tool displays On or Off.

MAF Sensor: The scan tool range is 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 (MAF) sensor input signal to the powertrain control module (PCM) is a frequency which varies from around 3,000 Hz at idle to above 7,000 Hz at wide-open throttle. 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/ 0-4.97 volts. The manifold absolute pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, exhaust gas recirculation (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 to monitor intake manifold pressure changes during the EGR flow test, to update the barometric pressure (BARO) reading, and as an enabling factor for many of the diagnostics.

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

MIL Circuit Status: The scan tool indicates the diagnostic state of the output driver for the malfunction indicator lamp (MIL) circuit. The scan toot displays Fault, OK or Invalid State.

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 diagnostic trouble codes (DTCs).

Power Enrichment: The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the powertrain control module (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.

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 powertrain control module (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 to +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 powertrain control module (PCM) on the ignition control (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.

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

Start-Up IAT: The scan tool range is -40°C to +151°C (-40°F to +304°F) . The scan tool indicates the Intake air temperature at the time that the vehicle was started. Used by the heated oxygen sensor (HO2S) diagnostic to determine if the last startup was a cold start.

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

TCC PWM Solenoid Command: The scan tool indicates the commanded pulse width modulation (PWM) signal to the solenoid. The scan tool displays Hz.

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

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

TFP Switch: The scan tool displays PARK/NEUTRAL, REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. The transmission fluid pressure (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. Throttle position (TP) angle is computed by the powertrain control module (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 powertrain control module (PCM) on the throttle position (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 to reduce drive wheel slippage.

Torque Request Signal (If Equipped): The scan tool range is 0-100 percent. Represents the pulse width modulation (PWM) signal from the electronic brake and traction control module (EBTCM). The EBTCM reduces the Traction Control Desired Torque signal pulse width when a drive wheel slippage situation is detected. The powertrain control module (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 pulse width modulation (PWM) signal which indicates the percent of available torque the engine is delivering to the drive wheels. The electronic brake and traction control module (EBTCM) monitors the Traction Control Torque signal to ensure that the powertrain control module (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 mph and km/h for display.

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 powertrain control module (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 (VTD) 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.