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DTC P0622: Generator Field Not Switching Properly

NOTE: DTC is set when PCM attempts to regulate generator field with no result during monitoring. Possible causes are Automatic Shut Down (ASD) relay output open circuit, generator field resistance greater than 5 ohms, open generator field driver circuit, generator field driver circuit shorted to ground, defective generator or PCM.
  1. Turn ignition on. Using scan tool, erase trouble codes. Using scan tool, actuate generator field driver circuit. Using a voltmeter, backprobe generator field connector. Measure voltage between ground and ASD relay output circuit terminal. Generator field connector is located on back of generator. See WIRING DIAGRAMS  . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-3A  .
  2. Using a voltmeter, backprobe generator field connector generator field driver circuit. If voltage shifts from low to high, go to next step. If voltage does not shift from low to high, go to step  5 .
  3. Wiggle wiring harness from generator to PCM. Using scan tool, read DTCs with actuator test still running. If generator field driver circuit DTC sets, repair wiring harness as necessary where wiggling caused problem to appear. If DTC does not set, fault is currently not present. Test is complete. Perform TEST VER-3A  .
  4. Turn ignition off. Disconnect PCM harness connector. Disconnect field harness connector on rear of generator. Using an ohmmeter, measure resistance between generator field terminals on generator. If resistance is 5 ohms or more, repair or replace generator. Perform TEST VER-3A  . If resistance is less than 5 ohms, go to next step.
  5. Using an ohmmeter, check resistance of generator field driver circuit between generator field harness connector and PCM harness connector. See WIRING DIAGRAMS  . If resistance is 5 ohms or more, repair open generator field driver circuit. Perform TEST VER-3A  . If resistance is less than 5 ohms, go to next step.
  6. With generator field connector disconnected, measure resistance from either generator field terminal (on back of generator) to ground. If resistance is less than 5 ohms, replace shorted generator. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-3A  .
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