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  • P0580 Low Voltage Detected At The Speed Control Switch

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    P0580 LOW VOLTAGE DETECTED AT THE SPEED CONTROL SWITCH

    When Monitored and Set Condition:

    When Monitored: While the ignition is on
    Set Condition: Speed control MUX switch below 1.0 volts for 5 seconds.

    POSSIBLE CAUSES

    • S/C WIRING HARNESS OBSERVABLE PROBLEM
    • S/C SWITCH (ON/OFF)
    • CLOCKSPRING SHORTED TO GROUND
    • S/C SWITCH (RESUME/ACCEL)
    • S/C SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
    • S/C SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
    • ECM

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition on. With the DRBIII®, read the S/C Switch volts status in the ECM. Is the S/C Switch voltage below 1.0 volt?
      Yes --> Go To 3
      No --> Go To 2
    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. Turn the ignition off. Disconnect the S/C ON/OFF Switch harness connector.
      NOTE: Check connectors - Clean/repair as necessary.
      Turn the ignition on. With the DRBIII® in Sensors, read the S/C Switch volts in the ECM. Did the S/C Switch volts change to 5.0 volts?
      Yes --> Replace the S/C ON/OFF Switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 4
    4. Turn the ignition off. Disconnect the S/C RESUME/ACCEL Switch harness connector.
      NOTE: Check connectors - Clean/repair as necessary.
      Ignition on, engine not running. With the DRBIII® in Sensors, read the S/C Switch volts in the ECM. Did the S/C Switch volts go above 4.0 volts?
      Yes --> Replace the Resume/Accel Switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 5
    5. Turn the ignition off. Disconnect the clockspring 6-way harness connector (instrument panel wiring side). Turn the ignition on. With the DRBIII® in Sensors, read the S/C Switch volts in the ECM. Did the S/C Switch volts change to 5.0 volts?
      Yes --> Replace the Clockspring. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 6
    6. Turn the ignition off. Disconnect the S/C ON/OFF Switch harness connector. Disconnect the ECM harness connectors.
      NOTE: Check connectors - Clean/repair as necessary.
      Measure the resistance between the S/C Switch Signal circuit and ground (B-) at S/C ON/OFF Switch harness connector. Is the resistance below 5.0 ohms?
      Yes --> Repair S/C Switch Signal Circuit for a short to ground. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Go To 7
    7. Measure the resistance between the S/C Signal Circuit and the Sensor Ground Circuit at the ON/OFF switch harness connector. Is the resistance below 5.0 ohms?
      Yes --> Repair S/C Signal Circuit shorted to Sensor Ground. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).
      No --> Replace and program the ECM in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST VER - 4 (DIESEL).

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