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Home >> Pontiac >> 2003 >> Aztek AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0336: Crankshaft Position Sensor Circuit Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  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 data for this DTC. Turn ignition off. Start engine. Operate the vehicle within the Conditions for Running DTC or within the conditions that you observed from the Freeze Frame/Failure Records. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
    4. NOTE: A short to ground on the cam sensor 12-volt reference circuit can cause DTC P0327 to set. Test this circuit for a short to ground before proceeding with this diagnostic procedure.
  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 DVOM. Does the voltage measure near battery voltage? 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 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 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 parameter on the 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 one second each. Does 24 X 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 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 step  12.
  12. Test for an intermittent and 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 and for a poor connection at the CKP sensor "A". Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  14. Replace PCM. See REMOVAL & INSTALLATION - AZTEC & RENDEZVOUS article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to step  16.
  15. Replace CKP sensor "A". See REMOVAL & INSTALLATION - AZTEC & RENDEZVOUS article. 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 DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  17. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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