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Home › Saab › 2010 › 9-5 › Repair and Diagnosis › Electrical › Charging Systems › Charging And Starting System › Fault Diagnosis, Fault Codes › DTC P0621: Generator L-Terminal Circuit › Circuit/System Testing

Circuit/System Testing

  1. Verify that a test lamp illuminates between the G13 Generator B+ terminal 1 X1 and ground.
  2. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, disconnect the X1 harness connector at the G13 Generator.
  4. Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground.
  5. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  6. Engine running, test for greater than 3.5 V between the control circuit terminal 1 and ground.
  7. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  8. If the circuit tests normal, replace the G13 Generator.
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