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Home › Chevrolet › 1997 › Venture LS › Repair and Diagnosis › Engine Performance › System › Engine Control System - Tests W/Codes › Diagnostic Trouble Codes › DTC P1361 - Ignition Control Circuit Not Toggling › Diagnostic Procedures

Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. 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 P1361 sets, go to next step. If DTC does not set, see DIAGNOSTIC AIDS.
  3. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Connect a test light between battery voltage and PCM harness connector by-pass circuit. If test light illuminates, go to step 8). If test light does not illuminate, go to next step.
  4. Turn ignition on. With test light still connected between battery voltage and PCM harness connector by-pass circuit, use a DVOM to check resistance between PCM harness connector IC circuit and reference low circuit. If resistance 6000 ohms or greater, go to step 9). If resistance is not 6000 ohms or greater, go to next step.
  5. Turn ignition off. Disconnect ICM 14-pin connector. Check resistance between ICM 14-pin harness connector IC circuit and engine ground. If resistance is infinite, go to next step. If resistance is not infinite, go to step 10).
  6. Check by-pass circuit for open. If open is found, repair as necessary. After repairs, go to step 15). If circuit is open, go to next step.
  7. Check by-pass circuit for faulty connection at ICM. If faulty connection is found, repair as necessary. After repairs, go to step 15). If connection is okay, go to step 14).
  8. Turn ignition off. Disconnect ICM 14-pin connector. Turn ignition on. If test light illuminates, go to step 11). If test light does not illuminate, go to step 14).
  9. Turn ignition off. Disconnect ICM connectors. Turn ignition on. Check IC circuit for short to voltage. If short to voltage is found, repair as necessary. After repairs, go to step 15). If circuit is okay, go to step 13).
  10. Locate and repair short to ground in IC circuit. After repairs, go to step 15).
  11. Locate and repair short to ground in by-pass circuit. After repairs, go to step 15).
  12. Check by-pass circuit for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 15). If connection is okay, go to next step.
  13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step 15).
  14. Replace ICM. After replacing ICM, go to next step.
  15. Read and record FAIL RECORDS data for DTC P1361. Clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P1361 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1361 FAILED THIS IGN, repair is complete.
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