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Home › Cadillac › 2000 › Seville STS › Repair and Diagnosis › Engine Performance › System › Engine Control System - Self-Diagnostics - 4.6L › Diagnostic Tests › DTC P1617: Engine Oil Level Switch Circuit › 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. Using scan tool, check if any other DTCs are set. If other DTC(s) are set, diagnose affected DTC(s) first. If no other DTC(s) are set, go to next step.
  3. Ensure oil level is full. Operate vehicle within parameters specified in conditions for running this DTC. Using scan tool, observe engine oil display. If scan tool indicates engine oil as LOW, see DIAGNOSTIC AIDS . If scan tool does not indicate engine oil as LOW, go to next step.
  4. Turn ignition off. Raise vehicle. Disconnect EOL switch harness connector. Using scan tool, observe engine oil level display. If scan tool indicates that engine oil is LOW, go to step  6. If scan tool does not indicate that engine oil is LOW, go to next step.
  5. Turn ignition on. Leave EOL switch connector disconnected. Disconnect PCM harness connector. Check EOL circuit for a short to chassis/switch ground. Repair as necessary. After repairs, go to step  8. If circuit is okay, go to step  7.
  6. Replace engine oil level switch. After replacing switch, go to step  8.
  7. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  8. Using scan tool, review and record FAIL RECORDS data. Clear DTC. Operate vehicle within parameters specified in conditions for running this DTC. Monitor SPECIFIC DTC INFO for this DTC until test runs. If scan tool indicates that this DTC failed this ignition, go to step  2. If scan tool does not indicate that this DTC failed this ignition, system okay.
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