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Home >> Saturn >> 1998 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous Controls >> Pcm Controlled Generator
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Pcm Controlled Generator

  1. If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES article.
  2. Turn ignition switch to RUN position. If charging light illuminates, go to next step. If charging light does not illuminate, go to step 4).
  3. Start engine. If charging light does not go out, go to step 5). If charging light goes out, go to step 21).
  4. Turn ignition switch to LOCK position. Disconnect generator harness connectors. Turn ignition switch to RUN position. If charging light illuminates, go to step 6). If charging light does not illuminate, go to step 7).
  5. Turn ignition switch to LOCK position. Connect scan tool to data link connector. Turn ignition switch to RUN position. Ensure all accessories are off. Observe generator voltage on scan tool. If battery voltage is displayed, go to step 8). If less than battery voltage is displayed, go to step 9).
  6. Using a test light connected to ground, probe charging light signal circuit at generator harness connector. If test light illuminates, go to step 10). If test light does not illuminate, go to step 11).
  7. Replace or repair instrument cluster and/or charging light bulb as necessary. After repairs are complete, go to step 21).
  8. Using scan tool, check GEN F valve. If 5 percent is displayed, go to step 7). If 5 percent is not displayed, go to step 12).
  9. Turn ignition switch to LOCK position. Disconnect generator harness connectors. Turn ignition switch to RUN position. Using a test light connected to battery voltage, probe charging light signal circuit at generator harness connector. If test light illuminates, go to step 13). If test light does not illuminate, go to step 14).
  10. Locate and repair short to ground in charging light control signal circuit and go to step 21).
  11. Replace generator and go to step 21).
  12. Turn ignition switch to LOCK position. Disconnect generator harness connectors. Turn ignition switch to RUN position. Using a test light connected to battery voltage, probe generator field circuit at generator harness connector. If test light illuminates, go to step 15). If test light does not illuminate, go to step 16).
  13. Locate and repair short to ground in field circuit and go to step 21).
  14. Measure voltage at charging light signal circuit at generator harness connector. If 4.5 volts or greater exists, go to step 17). If 4.5 volts or greater does not exist, go to step 18).
  15. Locate and repair short to ground in field circuit. After repairs are complete, go to step 21).
  16. Locate and repair poor connection and/or open in field circuit. After repairs are complete, go to step 21).
  17. Measure voltage at battery voltage supply circuit at generator harness connector. If battery voltage exist, go to step 11). If battery voltage does not exist, go to step 19).
  18. Check for poor connection and/or open in battery voltage supply circuit. If poor connection and/or open does not exist, go to step 20). If poor connection and/or open exists, repair as necessary and go to step 21).
  19. Locate and repair poor connection and/or open in battery voltage supply circuit. After repairs are complete, go to step 21).
  20. Replace PCM and go to next step.
  21. Operate vehicle under condition under which original symptom was noted. If system does not operate properly, go to step 2).
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