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  • P0588 High Voltage Detected At The Speed Control Vent Driver

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    P0588 HIGH VOLTAGE DETECTED AT THE SPEED CONTROL VENT DRIVER

    When Monitored and Set Condition:

    When Monitored: While the engine is running and the Speed control is set.
    Set Condition: The Speed control vent commanded state is on and the feedback state is off.

    POSSIBLE CAUSES

    • SPEED CONTROL SERVO ASSEMBLY
    • (V35) SPEED CONTROL VENT SHORTED TO VOLTAGE
    • (V35) SPEED CONTROL VENT CIRCUIT SHORTED TO OTHER CIRCUITS
    • ECM
    • INTERMITTENT CONDITION
    • SPEED CONTROL SERVO

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition off. Disconnect the Speed control servo harness connector.
      NOTE: Check connectors - Clean/repair as necessary.
      Ignition on, engine not running. With the DRBIII®, actuate the Speed Control Vacuum Solenoid. Using a 12-volt test light connected to battery positive, check the Speed Control Vacuum Solenoid Output circuit in the Speed Control Assembly harness connector.
      NOTE: The test light must illuminate brightly.
      Compare the brightness to that of a direct connection to the battery. Does the test light cycle on and off and illuminate brightly?
      Yes --> Replace the speed control servo assembly.
      No --> Go To 2
    2. Turn the ignition off. Disconnect the ECM harness connector(s).
      NOTE: Check connectors - Clean/repair as necessary.
      Turn the ignition on. Measure the voltage of the Speed Control vent circuit between the Cruise Control Assembly harness connector and engine ground. Is the voltage above 1 volt?
      Yes --> Repair the Speed Control vent circuit for a short to voltage.
      No --> Go To 3
    3. Turn the ignition off. Measure the resistance between the Speed Control Vacuum circuit and all other circuits in the ECM connectors. Is the resistance less than 10 ohms?
      Yes --> Repair the (V35) Speed Control vent circuit shorted to other circuit.
      No --> Go To 4
    4. Reconnect the ECM harness connectors. Ignition on, engine not running. With the DRBIII®, actuate the Speed Control Vent Solenoid. Using a 12-volt test light connected to battery positive, check the Speed Control Vent Solenoid Output circuit in the Speed Control Assembly harness connector.
      NOTE: The test light must illuminate brightly.
      Compare the brightness to that of a direct connection to the battery. Does the test light cycle on and off and illuminate brightly?
      Yes --> Go To 5
      No --> Replace and program the ECM in accordance with the Service Information.
    5. Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
      Where any problems found?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
      No --> Replace the Cruise control servo.

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