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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0341 - Camshaft Position Sensor Circuit Performance >> 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, read and record FAIL RECORDS data for DTC P0341. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0341 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0341 FAILED THIS IGN, see DIAGNOSTIC AIDS.
  3. Turn ignition off. Disconnect PCM connectors. Using DVOM, check voltage on CMP sensor signal circuit at PCM harness connector. Turn ignition on. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step 5).
  4. Remove CMP sensor, leaving harness connector connected. Place a magnet on sensor. If voltage is now about zero volts, go to step 16). If voltage is not about zero volts, go to step 8).
  5. If voltage is greater than 5 volts, go to step 7). If voltage is not greater than 5 volts, go to next step.
  6. Turn ignition off. Disconnect Ignition Control Module (ICM) connector. Leave PCM connector disconnected. Turn ignition on. Connect a test light between battery voltage and ICM harness connector CMP sensor signal and CMP sensor input circuits. If test light illuminates, locate and repair short to ground in CMP sensor signal or input circuit and go to step 24). If test light does not illuminate, go to step 13).
  7. Turn ignition off. Disconnect Ignition Control Module (ICM) connector. Leave PCM connector disconnected. Turn ignition on. Connect a test light between engine ground and ICM harness connector CMP sensor input circuit. If test light illuminates, locate and repair short to voltage in CMP sensor input circuit. After repairs, go to step 24). If test light does not illuminate, go to step 18).
  8. Disconnect CMP sensor. Check voltage between CMP sensor harness connector sensor feed and sensor ground circuit. If voltage is about battery voltage, go to next step. If voltage is not about battery voltage, go to step 12).
  9. Check voltage CMP sensor harness connector sensor signal and sensor ground circuits. If voltage is 5-7 volts, go to next step. If voltage is not 5-7 volts, go to step 11).
  10. Check voltage on PCM harness connector CMP sensor input signal circuit. Connect a test light to CMP sensor harness connector sensor signal circuit. Repeatedly touch other end of test light to engine ground. If voltage switches from zero to 5 volts, go to step 15). If voltage does not switch, go to step 14).
  11. Turn ignition off. Disconnect Ignition Control Module (ICM) connector. Leave CMP sensor connector disconnected. Turn ignition on. Check CMP sensor signal circuit for open or short to voltage. Check CMP sensor input signal circuit for short to voltage. Repair as necessary. After repairs, go to step 24). If no problem is found, go to step 14).
  12. Turn ignition off. Disconnect ICM and CMP sensor connectors. Check sensor feed and sensor ground circuits for open between ICM and CMP sensor. Repair as necessary. After repairs, go to step 24). If no problem is found, go to step 14).
  13. Check for open in CMP sensor input signal circuit between ICM and PCM. Repair as necessary. After repairs, go to step 24). If circuit is okay, go to next step.
  14. Check for faulty connection at ICM. Repair as necessary. After repairs, go to step 24). If ICM connection is okay, go to step 17).
  15. Check for faulty connection at CMP sensor. Repair as necessary. After repairs, go to step 24). If connection is okay, go to step 19).
  16. Check for faulty connection at PCM. Repair as necessary. After repairs, go to step 24). If PCM connection is okay, go to step 20).
  17. Check for incorrect harness routing near secondary ignition components, ignition coil arcing to wiring harness or ICM. Check ignition coils for cracks, carbon tracking or other signs of damage. Check for secondary ignition wire(s) arcing to wiring harness. Repair as necessary. After repairs, go to step 24). If no problem is found, go to next step.
  18. Replace ICM. After replacing module, go to step 24).
  19. Replace CMP sensor. After replacing sensor, go to step 24).
  20. Check for incorrect harness routing near secondary ignition components, ignition coil arcing to wiring harness or ICM. Check ignition coils for cracks, carbon tracking or other signs of damage. Check for secondary ignition wire(s) arcing to wiring harness. Repair as necessary. After repairs, go to step 24). If no problem is found, go to next step.
  21. Reinstall CMP sensor. Using DVOM, check voltage on CMP sensor input signal circuit while cranking engine. If voltage switches from zero to 4 volts, go to next step. If voltage does not switch, go to step 23).
  22. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step 24).
  23. Replace faulty or missing CMP sensor. After repairs, go to next step.
  24. Read and record FAIL RECORDS data for DTC P0341. Clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0341 FAILED THIS IGN, repeat step 2). If scan tool does not display DTC P0341 FAILED THIS IGN, repair is complete.
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