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Home >> Pontiac >> 2000 >> Firebird Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1653: Low Engine Oil Level Light Control Circuit (Grand PRIX & Regal) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. Using a DVOM, check voltage between ground and low engine oil level light control circuit at PCM harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  6.
  3. Using DVOM in 10-amp scale, check current between ground and low engine oil level light control circuit at PCM harness connector. If current reading is.05-.50 amp, go to step  11. If current does not remain between.05-.50 amp, go to next step.
  4. Turn ignition off. Disconnect instrument panel harness connector. Leave PCM harness connector disconnected. Turn ignition on, with engine off. Using DVOM, check voltage between engine ground and low engine oil level light control circuit. If voltage reading is zero volts, go to step  10. If voltage reading is not zero volts, go to next step.
  5. Locate and repair short to voltage in low engine oil level light control circuit. After repairs, go to step  15.
  6. Check ignition feed fuse for instrument panel indicator lights. If fuse is blown, go to next step. If fuse is okay, go to step  8.
  7. Locate and repair short to ground in ignition feed circuit or instrument panel indicators. Replace fuse. After repairs, go to step  15.
  8. Turn ignition off. Disconnect instrument cluster connector. Turn ignition on, with engine off. Check voltage between ground and instrument cluster indicators ignition feed circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step  13.
  9. Check low engine oil level light control circuit for open or short to ground. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to next step.
  10. Repair low engine oil level light control circuit for faulty connection at PCM. After repairs, go to step  15.
  11. Turn ignition off. Reconnect PCM connector. Disconnect instrument cluster connector. Turn ignition on, with engine off. Connect a test light between low engine oil level light control circuit and ignition feed circuit at instrument panel harness connector. Using scan tool, cycle low engine oil level light on and off. If test light flashed on and off, see DIAGNOSTIC AIDS . If test light does not flash on and off, go to next step.
  12. Check low engine oil level light control circuit for faulty connection at PCM. Repair as necessary. After repairs, go to step  15. If connection is okay, go to step  14.
  13. Locate and repair open in ignition feed circuit to instrument panel indicators. After repairs, go to step  15.
  14. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  15. Using scan tool, read and record FAILURE RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, select SPECIFIC DTC INFO for this DTC. If scan tool indicates that this that this DTC FAILED THIS IGN, return to step  2. If scan tool does not indicate that this that this DTC FAILED THIS IGN, system is okay.
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