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Home >> Isuzu >> 2003 >> Ascender 5.3 P, RWD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Generators & Regulators >> Diagnostic Tests >> DTC P0622: Generator Field Circuit >> Diagnostic Procedure

Diagnostic Procedure

  1. Did you perform the Diagnostic System Check? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Start the engine. With a scan tool, observe the GEN - F Terminal parameter in the PCM data list. Does the scan tool indicate that the GEN - F Terminal parameter is within specified range (The Gen - F Terminal parameter range is 5-95 percent)? If yes, go to next step. If no, go to step  4.
  3. With the scan tool, command the generator OFF. Does the GEN - F Terminal equal the specified value (The Gen - F Terminal parameter value is 0 percent)? If yes, there is a possible poor connection. Perform DIAGNOSTIC SYSTEM TEST. If no, go to next step.
  4. Turn OFF the ignition. Disconnect the generator connector. Connect test lamp to battery positive voltage. Turn ON the ignition, with the engine OFF. Probe the F-Terminal in the generator connector. Observe the GEN - F Terminal signal parameter in the PCM data list. Is the GEN - F Terminal signal parameter near the specified value (The Gen - F Terminal signal parameter value is 100 percent)? If yes, test charging system output. If no, go to next step.
  5. Test the generator field duty cycle signal circuit for a short or open. Did you find and correct the condition? If yes, go to step  8. If no, go to next step.
  6. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  8. If no, go to next step.
  7. Replace the PCM. See POWERTRAIN CONTROL MODULE in REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. Did you complete the repair? If yes, go to next step.
  8. 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 yes, go to step  2. If no, system is OK.
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