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DTC P0622: Generator Field Control Circuit: Testing

NOTE: The Generator Field Driver circuit may also be referred to as Generator Field Control circuit.
  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Does the test light illuminate brightly and flash? If yes, go to next step. If no, go to step  3.
  2. With the DRBIII®, erase DTCs. Start the engine and allow it to idle. Wiggle the wire harness from the Generator to PCM. With the DRBIII®, read DTCs. Did the DTC reset? If yes, repair wire harness as necessary. If no, test is complete.
  3. Turn the ignition off. Disconnect the Generator harness connector. Using a 12-volt test light, jumper it across the Generator harness connector. Turn ignition on, engine not running. With the DRBIII®, actuate the Generator Field Driver circuit. Does the test light illuminate brightly and flash on and off? If yes, replace the Generator. If no, go to next step.
  4. Using a 12-volt test connected to battery voltage, probe the Generator Ground circuit in the Generator harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the open in the Generator Field Ground circuit.
  5. Ensure the ignition is off. Disconnect the PCM harness connectors. Measure the voltage on the Generator Field Driver circuit in the Generator harness connector. Is the voltage above 1.0 volt? If yes, repair the short to voltage in the Generator Driver circuit. If no, go to next step.
  6. Measure the resistance between ground and the Generator Field Driver circuit in the Generator harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the Generator Field Driver circuit. If no, go to next step.
    7. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal-to-pin connection. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  7. Measure the resistance of the Generator Field Driver circuit from the Generator harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the Generator Field Driver circuit.
    8. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  8. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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