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Home >> Cadillac >> 2000 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P1359: Ignition Control Group 1 Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, observe IC CKT. CYL. # STATUS OF LAST TEST for cylinder group "A" (1/4/6/7). If scan tool indicates OPEN or SHORT TO VOLTS, go to step  14. If scan tool does not indicate OPEN or SHORT TO VOLTS, go to next step.
  3. Using scan tool, observe IC CKT. CYL. STATUS OF LAST TEST for a specific cylinder within cylinder group "A" (1/4/6/7). If scan tool indicates OPEN or SHORT TO VOLTS, go to step  6. If scan tool does not indicate OPEN or SHORT TO VOLTS, go to next step.
  4. If scan tool indicates OPEN, go to next step. If scan tool does not indicate OPEN, see DIAGNOSTIC AIDS .
  5. Check affected cylinder bank ignition module assembly for damaged or disconnected ignition module assembly connector or loss of ignition module assembly power and/or ground. Repair as necessary. After repairs, go to step  15. If no problem is found, go to step  13.
  6. Turn ignition off. Disconnect ignition module assembly connector associated with affected IC circuit. Turn ignition on, with engine off. Using DVOM, check voltage between ground and affected IC circuit(s) in harness connector. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, go to step  9.
  7. Turn ignition off. Leave ignition module assembly connector disconnected. Disconnect PCM harness connector. Turn ignition on, with engine off. Check voltage between ground and affected IC circuit(s) in harness connector. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, go to step  14.
  8. Repair short to voltage in affected IC circuit(s). After repairs, go to step  15.
  9. Remove fuel injector fuses. Using DVOM, check frequency of affected IC circuit(s) while cranking engine. If frequency is 1-2 Hz, go to next step. If frequency is not 1-2 Hz, go to step  11.
  10. Check for poor connections at ignition cassette/connector associated with affected IC circuit(s). Repair as necessary. After repairs, go to step  15. If no problem is found, go to step  13.
  11. Check affected IC circuit(s) for open or poor connections at PCM. Repair as necessary. After repairs, go to step  15. If connections are okay, go to step  14.
  12. Check for damaged or disconnected ignition coil cassette/connector at each ignition coil. Repair as necessary. After repairs, go to step  15. If no problem is found, go to next step.
  13. Replace ignition control module. After replacing module, go to step  15.
  14. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  15. Using scan tool, review and record FREEZE FRAME and FAIL RECORDS data. Clear DTCs. Operate vehicle within parameter for setting this DTC. Using scan tool, monitor SPECIFIC DTC INFO for this DTC until test runs. If scan tool indicate that this DTC failed this ignition, go to step  2. If scan tool does not indicate that this DTC failed this ignition, system is okay.
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