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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1351 - Ignition Control (Ic) Circuit Open >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN 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 harness connector. Connect DVOM between IC and reference low circuits. Turn ignition on. Using test light connected to battery voltage, probe by-pass circuit. If resistance is greater than 500 ohms, go to step 4). If resistance is not greater than 500 ohms, go to next step.
  3. Turn ignition off. Disconnect ICM connector. Check IC circuit for open circuit. Repair as necessary. After repairs, go to step 8). If circuit is open, go to step 5).
  4. Check for faulty IC circuit connection at PCM. Repair as necessary. After repairs, go to step 8). If connection is okay, go to step 7).
  5. Check for faulty IC circuit connection at ICM. Repair as necessary. After repairs, go to step 8). If connection is 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 that this DTC FAILED THIS IGN, return to step 2). If scan tool does not display that this DTC FAILED THIS IGN, system is okay.
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