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  • P0622 Generator Field Not Switching Properly

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    P0622 GENERATOR FIELD NOT SWITCHING PROPERLY

    When Monitored and Set Condition:

    When Monitored: When the ignition is on.
    Set Condition: The feedback signal does not match the commanded signal for the voltage regulator.

    POSSIBLE CAUSES

    • GENERATOR
    • OPEN DRIVER CIRCUIT
    • GEN SOURCE SHORTED TO BATTERY NEGATIVE
    • (K20) FIELD DRIVER CIRCUIT SHORTED TO VOLTAGE
    • GEN SOURCE OPEN
    • ECM

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition off. Disconnect the Generator field harness connector. Check connectors - Clean/repair as necessary. Measure the resistance between the generator field terminals. Is the resistance between.5 and 15 Ohms?
      Yes --> Go To 2
      No --> Replace the Generator.
    2. Disconnect the ECM harness connectors. Check connectors - Clean/repair as necessary. Measure the resistance of the generator driver wire between the generator harness connector and the ECM harness connector. Is the resistance less than 10 ohms.
      Yes --> Go To 3
      No --> Repair the open driver circuit.
    3. Measure the resistance of the generator source circuit between the generator harness connector and battery negative. Is the resistance less than 10 ohms.
      Yes --> Repair the Gen source shorted to Battery negative.
      No --> Go To 4
    4. Measure the voltage between the (K20) generator field driver circuit in the generator harness connector and battery negative. Is the voltage greater than 1 volt?
      Yes --> Repair the (K20) Generator field driver circuit shorted to voltage.
      No --> Go To 5
    5. Measure voltage of the Gen source circuit at the generator harness connector. Is voltage within one volt of battery voltage?
      Yes --> Replace the ECM.
      No --> Repair the open or high resistance of Gen source circuit.

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