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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1361 - Ignition Control (Ic) Circuit Not Toggling >> 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. Using scan tool, clear DTCs. Start engine and allow it to idle for 2 minutes. Read DTCs. If DTC P1362 is also present, go to step 6). If DTC P1362 is not present, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Connect a test light between ground and IC circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
  4. Turn ignition on. Disconnect IC module connector. Turn ignition on. Using test light connected to ground, probe IC circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 12).
  5. Locate and repair short to voltage in IC circuit. After repairs are complete, go to step 14).
  6. Turn ignition off. Disconnect IC module and PCM harness connectors. Connect test light between battery voltage and IC circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
  7. Locate and repair short to ground in IC circuit. After repairs are complete, go to step 14).
  8. Turn ignition off. Leave IC module and PCM harness connectors disconnected. Connect test light between ground and IC by-pass circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 10).
  9. Locate and repair short to ground in IC by-pass circuit. After repairs, go to step 14).
  10. Locate and repair short between IC and by-pass circuits. After repairs, go to step 14). If circuit is okay, go to next step.
  11. Reconnect IC module connector. Leave PCM connector disconnected. Turn ignition on. Connect DVOM between IC and reference low circuits. Connect test light to battery voltage. If resistance switches from less than 500 ohms to 5000 ohms when test light is connected bypass circuit, go to step 13). If resistance is not as indicated, go to next step.
  12. Replace ICM. After replacing module, go to step 14).
  13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  14. 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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