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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Engine Controls - Self-Diagnostics - 8.1L) >> Diagnostic Tests >> DTC P0336: Crankshaft Position Sensor Circuit Performance >> Diagnostic Procedures

Diagnostic Procedures

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  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. NOTE: If DTC P0335 is also set, diagnose DTC P0335 before proceeding with this DTC. See DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT .
  2. Install a scan tool. Start the engine and idle for 2 minutes. Does the scan tool indicate that DTC P0336 failed this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  3. Visually and physically inspect all circuits going to the CKP sensor for the following:
    • Routed to close to secondary ignition wires or components.
    • Routed to close to after-market add-on electrical equipment.
    • Routed to close to solenoids, relays, and motors.

    If you find incorrect routing, correct the harness routing. Did you find and correct the condition? If yes, go to step  9. If no, go to next step.

  4. Inspect for poor connections at the CKP sensor. If you find a poor connection, repair the terminal as necessary. Did you complete the repair? If yes, go to step  9. If no, go to next step.
  5. Test for poor connections at the PCM for the CKP sensor circuits. If you find a poor connection repair the terminal as necessary. Did you complete the repair? If yes, go to step  9. If no, go to next step.
  6. Remove the CKP sensor. Inspect the CKP sensor for signs of damage. If you find the CKP sensor to be damaged, replace sensor. Did you find and correct the condition? If yes, go to step  9. If no, go to next step.
  7. Inspect the CKP reluctor wheel for damage. If you find the CKP reluctor wheel damaged, replace crankshaft. See appropriate article in ENGINES. Did you find and correct the condition? If yes, go to step  9. If no, go to next step.
  8. Replace the CKP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  9. 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.
  10. 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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