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Home >> Pontiac >> 1996 >> Trans Sport >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1672 - Low Oil Level Light Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Using a DVOM, check voltage between engine ground and PCM harness connector low engine oil level indicator driver circuit. If voltage is 9-16 volts, go to next step. If voltage is not 9-16 volts, go to step 6).
  3. Using DVOM in 10-amp scale, check current between engine ground and low engine oil level indicator driver circuit for 2 minutes. If current remains 0.1-1.5 amps, go to step 11). If current does not remain as specified, go to next step.
  4. With PCM connectors disconnected, disconnect instrument panel connector. Using DVOM, check voltage between engine ground and low engine oil level indicator driver circuit. If voltage reading is zero volts, go to step 10). If voltage reading is greater than zero volts, go to next step.
  5. Locate and repair short to voltage in low engine oil level indicator driver circuit, and go to step 15).
  6. Check instrument panel indicators ignition feed fuse. If fuse is blown, go to next step. If fuse is okay, go to step 8).
  7. Locate and repair short to ground in instrument panel indicators ignition feed circuit. Replace fuse and go to step 15).
  8. Disconnect instrument panel connector. Turn ignition on. Check voltage between engine ground and instrument panel indicators ignition feed circuit. If voltage is 9-16 volts, go to next step. If voltage is not 9-16 volts, go to step 13).
  9. Check low engine oil level indicator driver circuit for open or short to ground. If a problem is found, repair as necessary and go to step 15). If no problem is found, go to next step.
  10. Check low engine oil level indicator driver and instrument panel indicators ignition feed circuits for faulty connection at instrument panel and PCM. If faulty connection is found, repair as necessary and go to step 15). If connection is okay, diagnose and repair instrument panel problem as necessary.
  11. Turn ignition off. Reconnect PCM connectors. Disconnect instrument panel connector. Turn ignition on. Connect a test light between instrument panel harness connector low engine oil level indicator driver and ignition feed circuits. Using scan tool, cycle low engine oil level indicator on and off. If test light flashes 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 indicator driver circuit for faulty connection at PCM. If faulty connection is found, repair as necessary and go to step 15). If connection is okay, go to step 14).
  13. Locate and repair open low engine oil level indicator ignition feed circuit to instrument panel indicators, and go to step 15).
  14. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  15. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P1672. If scan tool displays DTC P1672 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1672 FAILED THIS IGN, repair is complete.
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