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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. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Disconnect the generator field harness connector. Using a 12-volt test light, jumper it across the generator field harness connector. Ignition on, engine not running. With the DRBIII® scan tool, 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.
  3. Turn the ignition off. Disconnect the generator field harness connector. Using a 12-volt test connected to battery voltage, probe the (Z1) generator ground circuit in the generator field harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the open in the (Z1) generator field ground circuit.
  4. Turn the ignition off. Disconnect the generator field harness connector. Disconnect the PCM harness connectors. Measure the voltage on the (K20) generator field control circuit in the generator field harness connector. Is the voltage above 1.0 volts? If yes, repair the short to voltage in the (K20) generator field control circuit. If no, go to next step.
  5. Turn the ignition on. Disconnect the generator field harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K20) generator field control circuit in the generator field harness connector. Is the resistance below 100 ohms? If yes, repair the (K20) generator field control circuit for a short to ground. If no, go to next step.
    6. 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. Install Miller Special Tool (8815) to perform diagnosis.
  6. Turn the ignition off. Disconnect the generator field harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K20) generator field control circuit from the generator field harness connector to the appropriate terminal of the Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K20) generator field control circuit.
  7. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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