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  • P0581 High Voltage Detected At The Speed Control Switch

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    Mopar1973Man

    P0581 HIGH VOLTAGE DETECTED AT THE SPEED CONTROL SWITCH

    When Monitored and Set Condition:

    When Monitored: Key on or Engine running.
    Set Condition: Speed Control MUX switch above 11.5 volts for 5 seconds.

    POSSIBLE CAUSES

    • S/C WIRING HARNESS OBSERVABLE PROBLEM
    • CLOCKSPRING SIGNAL/GROUND CIRCUIT OPEN
    • SPEED CONTROL ON/OFF SWITCH
    • S/C SWITCH SIGNAL CKT SHORTED TO VOLTAGE
    • S/C SWITCH SIGNAL CIRCUIT OPEN ECM TO CLOCK SPRING
    • S/C SWITCH SIGNAL CIRCUIT OPEN CLOCKSPRING TO S/C SWITCH
    • S/C SWITCH GROUND CIRCUIT OPEN CLOCKSPRING TO S/C SWITCH
    • S/C SWITCH GROUND CIRCUIT OPEN ECM TO CLOCKSPRING
    • ECM

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition on. With the DRBIII® in Inputs/Outputs, read the Speed Control inputs state in ECM. While monitoring the DRBIII®, push the Speed Control On/Off Switch several times, then leave it on. Did the DRBIII® show Speed Control Switch off and on?
      Yes --> Go To 2
      No --> Test Complete.
    2. Turn the ignition off. Using the Schematics as a guide, inspect the Wiring and Connectors. Were any problems found?
      Yes --> Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 3
    3. Disconnect the upper and lower 6-way clockspring harness connectors.
      NOTE: Check connectors - Clean/repair as necessary.
      Measure the resistance of the sensor ground circuit between the upper and lower 6-way clockspring harness connectors. Measure the resistance of the speed control switch signal circuit between the upper and lower 6-way clockspring harness connectors. Was the resistance above 5.0 ohms for either circuit?
      Yes --> Replace the clockspring. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 4
    4. Disconnect the Speed Control On/Off Switch 2-way harness connector only.
      NOTE: Check connectors - Clean/repair as necessary.
      Measure the resistance across the S/C On/Off Switch. Is the resistance between 20.3K and 20.7K ohms?
      Yes --> Go To 5
      No --> Replace the On/Off Switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
    5. Turn the ignition on. Measure the voltage of the S/C Switch Signal Circuit at the On/Off Switch 2-way connector. Is the voltage above 6.0 volts?
      Yes --> Repair the Speed Control Switch Signal Circuit for a short to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 6
    6. Turn the ignition off. Disconnect the ECM harness connector.
      NOTE: Check connectors - Clean/repair as necessary.
      Measure the resistance of the S/C Switch Signal Circuit between the ECM connector and the Clockspring Connector. Is the resistance below 5.0 ohms?
      Yes --> Go To 7
      No --> Repair open Speed Control Switch Signal Circuit ECM to Clock-spring. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
    7. Measure the resistance of the S/C Switch Signal Circuit from the clockspring harness connector to the On/Off switch harness connector. Is the resistance below 5.0 ohms?
      Yes --> Go To 8
      No --> Repair the open Speed Control Switch Signal Circuit Clockspring to S/C switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
    8. Measure the resistance of the S/C Switch Sensor Ground Circuit between the On/Off Switch 2-way harness connector to the clockspring harness connector. Is the resistance below 5.0 ohms?
      Yes --> Go To 9
      No --> Repair open ground circuit from clockspring to S/C switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
    9. Measure the resistance of the S/C Switch Sensor Ground Circuit between the ECM harness connector to the clockspring harness connector. Is the resistance below 5.0 ohms?
      Yes --> Replace and program the ECM in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Repair open ground circuit from ECM to clockspring. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).

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