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DTC P0622: Generator Field Not Switching Properly: Testing

  1. Turn ignition on. Using scan tool, actuate generator field driver circuit. Using a test light connected to ground, backprobe Dark Green wire on back of generator. If test light blinks, go to next step. If test light does not blink, go to step  4.
  2. Using scan tool, erase DTCs. Wiggle wiring harness from generator to PCM. Using scan tool, read DTCs with actuator test still running. If generator field driver circuit failure returns and DTC P0622 resets, repair wiring harness as necessary where wiggling caused problem to appear. If DTC P0622 does not reset, go to next step.
  3. At this time, conditions required to set DTC are not present. Turn ignition off. Visually inspect related connectors, hoses and wiring harness for damage. Repair connectors, hoses and wiring harness as necessary. If connectors, hoses and wiring harness are okay, test is complete.
  4. Using scan tool, read and record FREEZE FRAME data and DTCs. Erase DTCs. Inspect generator and PCM connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, use scan tool and actuate generator field driver circuit. With voltmeter connected to ground, backprobe Orange/Dark Green wire on back of generator. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Orange/Dark Green wire.
  5. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). See Figure. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, disconnect generator 2-pin connector. Measure resistance between ground and terminal No. 8 (Dark Green wire) at PCM C1 harness connector. See Figure. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green wire.
  6. Measure resistance of Dark Green wire between generator harness connector and terminal No. 8 at PCM C1 harness connector. If resistance is less than 5 ohms or more, go to next step. If resistance is 5 ohms or more, repair open in Dark Green wire.
  7. Measure resistance between generator field terminals on back of generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair or replace generator.
  8. At this time, PCM is assumed to be defective. Replace PCM.
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