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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1352 - By-Pass Circuit Open >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Connect DVOM between IC and reference low circuit. Connect test light between battery voltage and by-pass circuit. If resistance is greater than 5000 ohms, go to step 4). If resistance is not greater than 5000 ohms, go to next step.
  3. Turn ignition off. Disconnect ICM harness connector. Check for open in by-pass circuit. Repair as necessary. After repairs, go to step 8). If circuit is okay, go to step 5).
  4. Check for poor terminal connections at PCM. Repair as necessary. After repairs, go to step 8). If connections are okay, go to step 7).
  5. Check for poor terminal connections at ICM. Repair as necessary. After repairs, go to step 8). If connections are okay, go to next step.
  6. Replace ICM. After replacing module, go to step 8).
  7. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  8. Read and record FAIL RECORDS data for this DTC. Clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC FAILED THIS IGN, return to step 2). If scan tool does not display DTC FAILED THIS IGN, repair is complete.
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