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Home >> Buick >> 2002 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P0336: CKP Sensor Circuit Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Start engine. Observe the 24X parameter with a scan tool. Does 24X RPM vary with engine speed up to about 1600 RPM? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off. Start engine. Operate the vehicle within the conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
    NOTE: A short to ground on the camshaft position sensor 12-volt reference circuit can cause DTCs P0336 and P0341 to set. Test this circuit for a short to ground before proceeding with this diagnostic test.
  4. Turn ignition off. Disconnect the CKP sensor "A" connector. Turn ignition on, with engine off. Measure the voltage from the 12-volt reference circuit of the CKP sensor "A" to a good ground with the Digital Multimeter (DMM). Does the voltage measure about B+? If yes, go to step  6. If no, go to next step.
  5. Test the 12-volt reference circuit of the CKP sensor "A" for a short to ground or for an open. Did you find and correct the condition? If yes, go to step  16. If no, go to step  12.
  6. Connect a test light to battery positive voltage. Touch the CKP sensor "A" low reference circuit. Does test light illuminate? If yes, go to step  8. If no, go to next step.
  7. Test the low reference circuit of the CKP sensor "A" for an open. Did you find and correct the condition? If yes, go to step  16. If no, go to step  12.
  8. Observe the 24X RPM with a scan tool. Connect a 5-amp fused jumper wire to battery positive voltage, momentarily touch the medium resolution engine speed signal circuit 5 times for a duration of 1 second each. Does 24X RPM change each time the signal circuit is touched? If yes, go to step  13. If no, go to next step.
  9. Did the fuse in the jumper wire open? If yes, go to step  11. If no, go to next step.
  10. Test the medium resolution engine speed signal circuit of the CKP sensor "A" for a short to voltage or for an open. Did you find and correct the condition? If yes, go to step  16. If no, go to step  12.
  11. Test the medium resolution engine speed signal circuit of the CKP sensor "A" for a short to ground. Did you find and correct the condition? If yes, go to step  16. If no, go to next step.
  12. Test for an intermittent or for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  16. If no, go to step  14.
  13. Test for an intermittent or for a poor connection at the 24X CKP sensor. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  14. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  15. Replace CKP sensor "A". After repairs, go to next step.
  16. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  17. Using scan tool, observe stored information and Capture Info. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other DTCs are displayed, system is okay.
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