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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0336: Crankshaft Position Sensor "A" Circuit Range/Performance >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  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. Attempt to start the engine. Will the engine start? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC failed this ignition? If yes, go to next step. If no, go to step  5.
  4. With the engine running, wiggle the electrical connectors of the following components and related circuits while listening for the engine to stumble:
    • The PCM
    • The CKP sensor

    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 scan tool. Does the Med. Resolution Resync Counter on scan tool increment while operating any non-engine related electronic components? If yes, go to step  9. If no, go to step  14.
  6. Turn ignition off. Repair intermittent and a poor connection that caused the engine to stumble. After repairs, go to step  14.
  7. Did the MIL illuminate in step  3? If yes, go to next step. If no, go to step  14.
  8. Turn ignition off. Check the following items for rubbed-through wire insulation or for wiring being pinched:
    • The PCM.
    • The CKP sensor.

    Repair wiring as necessary. After repairs, go to step  14. If no problem was found, 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 sensor and ICM wiring harness. After repairs, go to step  14.
  10. Remove CKP sensor. Visually inspect the CKP sensor for any physical damage, loose or improper installation, or wiring routed too closely to secondary ignition components. Did you find and correct the condition? If yes, go to next step. If no, go to step  14.
  11. Visually inspect the CKP sensor reluctor wheel for damage or looseness. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  12. Replace CKP sensor. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. 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  14.
  13. Replace PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Clear the DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate 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.
  15. Observe the stored information, Capture Info with scan tool. Does 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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