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DTC P0621: Generator L-Terminal Circuit: Testing

  1. If diagnostic system check was not performed, go to ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK  . After diagnostic system check is performed, go to next step.
  2. Install a scan tool. Start the engine. With a scant tool, monitor the DTC INFORMATION for DTC P0621 in Engine Controls. Does the scan tool indicate that DTC P0621 has passed? If so, go to INTERMITTENTS  . If not, go to next step.
  3. Test the generator turn on signal circuit for a short or open. Did you find and correct the condition? If so, go to step  6 . If not, go to next step.
  4. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If so, go to step  6 . If not, go to next step.
  5. Replace and reprogram the PCM. See POWERTRAIN CONTROL MODULE . After repair, go to next step.
  6. Review and record the scan tool Fail Records data. Clear any DTCs. Operate the vehicle within the Fail Records conditions as noted. Using a scan tool, monitor the SPECIFIC DTC INFO for this DTC. Does the scan tool indicate that this DTC failed this ignition? If so, go to step  2 . If not, system is okay.
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