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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0336: Crankshaft Position Sensor Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  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. Attempt to start the engine. Will the engine start? If yes, go to next step. If no, go to appropriate NO-START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC or as close to the Freeze Frame/Failure Records data that you observed. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition? If yes, go to next step. If no, go to step  5.
  4. With engine running, wiggle PCM and CKP electrical connectors and related circuits while listening for the engine to stumble. Does the engine stumble? If yes, go to step  6. If no, go to step  7.
  5. Operate any non-engine related electronic component on the vehicle. Observe the Med. Resolution Resync Counter with the scan tool. Does the Med. Resolution Resync Counter on the scan tool increment while operating any non-engine related electronic components? If yes, go to step  9. If no, go to next step.
  6. Turn ignition off. Check for a poor electrical terminal connection or replace the terminal in the circuit which caused the engine to stumble. Repair electrical connection or the terminal in the circuit as necessary. After repairs, go to step  12.
  7. Did the MIL illuminate in step  3? If yes, go to next step. If no, go to step  12.
  8. Turn ignition off. Check for rubbed-through wire insulation or for wiring being pinched in the PCM or CKP sensor. Repair wiring as necessary. Did you complete the repair? If yes, go to step  12. If no, go to step  10.
  9. Turn ignition off. Repair circuitry of the malfunctioning or interfering component. Move any wiring that is causing the interference away from the CKP wiring harness. After repairs, go to step  12.
  10. Replace CKP sensor. Idle the engine for 5 minutes or until the Malfunction Indicator Light (MIL) turns ON. Did the MIL illuminate? If yes, go to next step. If no, go to step  12.
  11. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
  12. Use the scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  13. With a scan tool, observe the stored information, Capture Info. 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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