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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 P1350 - Ignition Control Circuit >> Diagnostic Procedures
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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. Using scan tool, clear DTCs. Start engine and allow it to idle for 2 minutes. Read DTCs. If DTC P1350 sets, go to next step. If DTC does not set, go to DIAGNOSTIC AIDS.
  3. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Using a DVOM, check resistance between PCM harness connector IC and ground circuits. If resistance is less than 500 ohms, go to step 6). If resistance is 500 ohms or greater, go to next step.
  4. Turn ignition off. Disconnect ICM connector. Check IC circuit for open. If open is found, repair as necessary and go to step 10). If no open is found, go to next step.
  5. Check for faulty IC circuit connection at ICM. If faulty connection is found, repair as necessary and go to step 10). If connection is okay, go to step 8).
  6. Check for faulty IC circuit connection at PCM. If faulty connection is found, repair as necessary and go to step 10). If connection is okay, go to next step.
  7. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to step 10).
  8. Turn ignition on. Check by-pass circuit for short to voltage. If short to voltage is found, repair as necessary and go to step 10). If short to voltage is not found, go to next step.
  9. Replace ICM and go to next step.
  10. Read and record FAIL RECORDS data for DTC P1350. Clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P1350 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1350 FAILED THIS IGN, repair is complete.
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