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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0335: Crankshaft Position Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 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. Start the engine. Observe the CKP active counter on the scan tool. Does the CKP active counter increment? If yes, go to next step. If no, go to step  4 .
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS  .
  4. Disconnect the PCM harness from the PCM. Connect the Digital Multimeter (DMM) between the CKP sensor circuits, set to the ohm scale. Is the resistance 500-900 ohms? If yes, go to next step. If no, go to step  6 .
  5. Test the CKP circuits for a short to ground. Repair the condition as necessary. Did you find and correct the condition? If yes, go to step  11 . If no, go to step  9 .
  6. Test the CKP circuits for the following conditions:
    • A short to voltage.
    • An open.
    • A short across circuits.
    • A high resistance.

    Repair the condition as necessary. Did you find and correct the condition? If yes, go to step  11 . If no, go to next step.

  7. Inspect for poor connections at the CKP sensor. After repairs, go to step  11 . If no, go to next step.
  8. Replace the CKP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  11 .
  9. Inspect for faulty connections at the PCM. Did you find and correct the condition? If yes, go to step  11 . If no, go to next step.
  10. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  11. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  12. 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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