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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 508 (Differential) >> Trouble Shooting >> Scan Tool Diagnostics >> Scan Tool Data Definitions
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Scan Tool Data Definitions

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

  1. AWD Circuit Status

    Displays OK, Short or Open. This parameter indicates the status of the PWM signal line to the AWD solenoid. The PCM can detect a short to ground, a short to power, or an open in the PWM signal line. The AWD DISABLE light will be illuminated for Short and Open conditions.

  2. AWD Clutch Temperature Disable

    Displays Yes or No. This parameter displays the status of powertrain software that has the ability to disable AWD based on a rear drive module clutch slip/time calculation. If the software determines that a clutch over-temperature condition could exist, the PCM will deactivate the AWD system by disabling the PWM signal line to the AWD solenoid. The AWD System will be re-enabled when the software calculates that the clutch temperatures have dropped sufficiently. The AWD DISABLE light will be illuminated for a YES condition.

  3. AWD Duty Cycle

    The All Wheel Drive (AWD) Duty Cycle parameter displays the commanded state of the AWD solenoid expressed as a percent of ON time. At vehicle start-up, duty cycle will be at 75-90% for 3 seconds. This is referred to as the pull-in duty cycle. After 3 seconds the duty cycle will drop to 20-30% for 30 seconds. This is referred to as the hold-in duty cycle. After each 30 second hold-in period, the duty cycle will be increased to 75-90%, pull-in duty cycle, for 0.5 second before returning to the hold-in duty cycle. This is to assure solenoid pull-in.

  4. AWD Fluid Temperature Disable

    Displays YES or NO. This parameter indicates a fluid over-temperature condition in the rear drive module. When the sump temperature exceeds approximately 230°F (110°C), a pull-up resistor grounds the PWM signal line from the PCM at the AWD solenoid. The pull-up resistor is an integral part of the AWD solenoid. The pull-up resistor will close the valve and command the PCM to illuminate the AWD DISABLE light for a YES condition. The scan tool will indicate a 100% duty cycle because the pull-up resistor in the valve is bypassing the PCM.

  5. AWD Voltage Disable

    Displays YES or NO. This parameter indicates whether the ignition voltage to the AWD solenoid is in the proper range. The ignition voltage range to the AWD solenoid is 9.0 to 16.0 volts. The PCM will deactivate the AWD system by disabling the PWM signal line to the AWD solenoid if the ignition voltage is out of range. The AWD DISABLE light will be illuminated for a YES condition.

  6. AWD Mini Spare Disable

    The All Wheel Drive (AWD) Mini spare Disable parameter indicates whether the ABS module detects a mini spare on the vehicle and displays Yes or No. The wheel rotational speed difference is detected by the wheel speed sensors of the ABS system. If the ABS module detects a mini spare on the vehicle, the PCM will deactivate the AWD system by disabling the PWM signal line to the AWD solenoid. The AWD Disabled lamp will be illuminated for a Yes condition.

  7. AWD Overtemperature Delay

    The All Wheel Drive (AWD) Overtemperature Delay parameter indicates whether the AWD system is in a reset mode following an AWD fluid temperature disable and displays Yes or No. There is a 10 minute delay from the time the rear drive module resistor closes the PWM signal line until the PCM again checks the signal line for an overtemperature condition. The rear drive module resistor is an integral part of the AWD solenoid. The AWD Disabled lamp will be illuminated for a Yes condition.

  8. AWD Torque Management

    Displays ACTIVE or INACTIVE. This is an indication that some form of torque management is being performed to protect the AWD System. If either or both of these powertrain software features are functioning, a service scan tool will display ACTIVE.

  9. AWD Wheel Speed Disable

    Displays Yes or No. This parameter indicates whether the wheel speed data received from the ABS controller is valid. If the ABS module detects an unacceptable wheel speed differential, the PCM will deactivate the AWD system by disabling the PWM signal line to the AWD solenoid. The AWD DISABLE, BRAKE, and ANTI-LOCK Indicators, will be illuminated for a Yes condition. The chime will also sound.

  10. AWD DISABLE Mileage

    Displays mileage. This parameter indicates the vehicle mileage at which the AWD Last Disable condition occurred.

  11. Current Gear

    Displays 1, 2, 3 or 4. This parameter indicates the current commanded state of the shift solenoid valves.

  12. ECT (Engine Coolant Temperature)

    The Engine Coolant Temperature (ECT) sensor is mounted in the coolant stream and sends engine temperature information to the PCM. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor that changes internal resistance as temperature changes. When the sensor is cold, the internal resistance is high, the PCM monitors a high signal voltage. The PCM interprets this voltage as a cold engine. As the sensor warms, the internal resistance decreases, the voltage signal will decrease. The PCM interprets the lower voltage as a warm engine.

  13. Engine Speed

    This parameter indicates the rotational speed of the engine expressed as revolutions per minute. The engine speed is computed by the PCM from the fuel control reference input, the crankshaft position sensor.

  14. Engine Torque

    This parameter indicates the amount of torque being delivered by the engine and is displayed in both English and metric units.

  15. Gear Ratio

    This display is the actual transmission gear ratio as the transmission operates through all DRIVE, REVERSE and PARK/NEUTRAL ranges.

  16. Ignition Voltage

    This parameter is the system voltage measured by the PCM at the PCM ignition input when the ignition switch is in the RUN position.

  17. Last Disable Reason

    Displays only the last AWD DISABLE reason. The possible reasons are output controls, fluid temp, clutch temp, wheel speed, voltage, mini spare or ABS System. The output controls reason indicates that AWD was last disabled with a service scan tool. Fluid temp, clutch temp, wheel speed, voltage and mini spare each have a unique parameter that is described elsewhere in this table. ABS system reason indicates that messages normally sent to the PCM by the ABS controller are missing.

  18. TP (Throttle Position) Angle

    Displays 0-100%. The TP angle is computed by the PCM from the TP sensor voltage. The TP angle should display 0% at idle and 100% at Wide Open Throttle (WOT).

  19. Trans. Fluid Temp. (Transmission Fluid Temperature)

    The Transmission Fluid Temperature parameter displays the temperature conversion of the voltage input signal to the PCM from the transmission fluid temperature (TFT) sensor. When the TFT is high 304°F (151°C), the signal voltage is low, 0 volts. When the TFT is low -40°F (-40°C), the signal voltage is high, 5 volts.

  20. Transmission ISS (Input Shaft Speed)

    Displays 600-700 RPM. This parameter is the rotational speed of the transmission input shaft as expressed in Revolutions Per Minute (RPM).

  21. Transmission OSS (Output Shaft Speed)

    Displays 0 RPM. This display indicates the rotational speed of the transmission output shaft as expressed in Revolutions Per Minute (RPM).

  22. Vehicle Speed

    This parameter is the Vehicle Speed Sensor (VSS) input signal converted by the PCM to be displayed as vehicle speed in both Metric and English units.
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