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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0335 or P0336 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0651 is not set.
    • Go to next step: If the DTC is not set 
  3. Engine - Running
  4. Verify DTC P0336 is not set.
    • If the DTC is set 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  5. Verify the scan tool parameter: Crankshaft Position Active Counter = Increments
    • If the parameter value does not increment 

      Refer to: Circuit/System Testing

    • Go to next step: If the parameter value increments 
  6. Verify the scan tool parameter: Crankshaft Position Resync Counter = 0 Counts - The engine should not stumble/stall.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B26 Crankshaft Position Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If greater than 0 counts 

      Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

    • Go to next step: If 0 counts 
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  8. All OK.