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Home >> Pontiac >> 2002 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0351-P0358: Ignition Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. In order to operate the vehicle under the conditions which set the DTC, use the data in the Freeze Frame/Failure Records and the parameters listed in the Conditions for Running DTC. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn OFF the engine. Disconnect the respective electrical connector of the ignition coil. Start the engine. Connect the Digital Multimeter (DMM), select the DC Hertz setting in order to measure the frequency at the respective IC signal circuit. Does the frequency measure 3-20 Hz? If yes, go to step  7. If no, go to next step.
  4. Measure the voltage at the respective IC signal circuit with the DMM. Is the signal circuit voltage more than 1 V? If yes, go to step  13. If no, go to next step.
  5. Turn OFF the ignition. Disconnect the PCM connector. Connect the DMM in order to test the continuity from the respective ignition control circuit, at the ignition coil electrical connector, to the PCM connector. Does the DMM indicate continuity? If yes, go to next step. If no, go to step  14.
  6. Test the respective ignition control circuit for a short to ground. Did you find and correct the condition? If yes, go to step  17. If no, go to step  15.
  7. Turn ON the ignition, with the engine OFF. Connect a test lamp to the battery ground in order to probe the Ignition 1 voltage circuit of the IC. Does the test lamp illuminate? If yes, go to next step. If no, go to step  9.
  8. Connect a test lamp to battery voltage in order to probe the ground circuit of the Ignition Coil. Does the test lamp illuminate? If yes, go to step  11. If no, go to step  10.
  9. Repair the open in the ignition 1 voltage circuit. After repairs, go to step  17.
  10. Repair the open in the ground circuit for the IC. After repairs, go to step  17.
  11. Inspect for poor connections at the IC harness connector. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  12. Replace the ignition coil. After repairs, go to step  17.
  13. Repair the IC circuit for a short to voltage. Did you complete the repair? If yes, go to step  17. If no, go to step  15.
  14. Repair the IC circuit for an open circuit. After repairs, go to step  17.
  15. Inspect for poor connections at the PCM harness connector. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  16. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  17. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  18. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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