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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1362 - By-Pass Circuit Shorted >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Clear DTCs. If DTC P1361 is set, go to step 6). If DTC P1361 is not set, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, engine off. Using a test light connected to ground, probe by-pass circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
  4. Turn ignition off. Leave PCM disconnected. Disconnect ICM harness connector. Turn ignition on. Using test light connected to ground, probe by-pass 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 by-pass circuit. After repairs, go to step 14).
  6. Turn ignition off. Disconnect ICM and PCM harness connectors. Using test light connected to battery voltage, probe 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. Leave ignition off, ICM and PCM connectors disconnected. Using test light connected to ground, probe 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 by-pass circuit. After repairs, go to step 14).
  10. Leave ignition off, ICM and PCM connectors disconnected. Check for short between IC and by-pass circuits. Repair as necessary. After repairs, go to step 14). If circuit is okay, go to next step.
  11. Leave ignition off and PCM connector disconnected. Reconnect IC module connector. Using DVOM, check resistance between IC and reference low circuits while probing by-pass circuit using test light connected to battery voltage. If resistance switches from less than 500 ohms to greater than 5000 ohms, go to step 13). If resistance does not switch from less than 500 ohms to greater than 5000 ohms, go to next step.
  12. Replace IC control module. After replacing module, go to step 14).
  13. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
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