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Home >> Buick >> 1996 >> LeSabre Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1619 - Engine Oil Life Monitor Reset 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. Go to next step.
  2. Turn ignition on. Using scan tool, observe OIL LIFE SWITCH. If scan tool displays PRESSED, go to next step. If scan tool does not display PRESSED, see DIAGNOSTIC AIDS.
  3. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Connect a test light between battery voltage and PCM harness connector OLM reset circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 6)
  4. Disconnect OLM reset switch. Connect a test light between battery voltage and PCM harness connector OLM reset circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 7)
  5. Locate and repair short to ground in OLM reset circuit. Go to step 8).
  6. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to step 8).
  7. Replace OLM reset switch and go to next step.
  8. Turn ignition on. Using scan tool, observe OIL LIFE SWITCH. If scan tool displays PRESSED, return to step 3). If scan tool does not display PRESSED, repair is complete.
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