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DTC P0622: Generator Field Not Switching Properly

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Monitored with ignition on and engine running. Set condition is when PCM tries to regulate generator field with no result during monitoring. Possible causes are: ASD relay output circuit open, generator field resistance more than 5 ohms, generator field driver circuit open, generator field driver circuit short to ground, intermittent wiring harness failure or PCM defective.
  1. Turn ignition on with engine off. Using scan tool, erase DTCs. Using scan tool, actuate generator field driver circuit. Using a DVOM, check voltage of ASD relay output circuit (Dark Green/Orange wire) by backprobing 2-pin generator connector located on back of generator. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit to generator wiring harness. Perform TEST VER-3A: CHARGING VERIFICATION: CHARGING VERIFICATION  .
  2. With scan tool still actuating generator field driver circuit, backprobe generator field driver circuit (Dark Green wire) by backprobing 2-pin generator connector located on back of generator. 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. With scan tool still actuating generator field driver circuit, wiggle generator wiring harness. Stop driver circuit actuation. Using scan tool, read DTCs. If DTC did not return, go to next step. If DTC returned, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-3A: CHARGING VERIFICATION: CHARGING VERIFICATION  .
  4. Turn ignition off. Inspect wiring and connectors for damage. If wiring and connectors are okay, test is complete. If wiring and connectors are not okay, repair or replace as necessary. Perform TEST VER-3A: CHARGING VERIFICATION  .
  5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector C1 (located nearest to front of vehicle). PCM is located to left of Power Distribution Center (PDC) in engine compartment. Disconnect generator 2-pin connector. Inspect electrical connectors and clean/repair as necessary. Using a DVOM, check resistance across 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 generator as necessary. Perform TEST VER-3A: CHARGING VERIFICATION  .
  6. Using a DVOM, check resistance of generator field driver circuit (Dark Green wire) between generator 2-pin connector and PCM connector C1 terminal No. 8. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open generator field driver circuit. Perform TEST VER-3A: CHARGING VERIFICATION  .
  7. Using a DVOM, check resistance of generator field driver circuit (Dark Green wire) between generator 2-pin connector and chassis ground. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair generator field driver circuit short to ground. Perform TEST VER-3A: CHARGING VERIFICATION  .
  8. If no other potential causes are remaining, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A: CHARGING VERIFICATION  .
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