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Home >> Cadillac >> 2009 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0153 To DTC P0651 >> DTC P0336 >> Circuit/System Verification
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Circuit/System Verification

  1. With the ignition OFF, inspect the engine wiring harnesses carrying the CKP sensor circuits for the following conditions:
    • Close routing of aftermarket electrical equipment
    • Close to solenoids, motors, and relays
    • Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference.
  2. With the ignition ON, and the engine OFF, use the live plot function on the scan tool. Select the engine speed parameter and the CKP sensor parameter. Change the minimum spec to 400 RPM for both parameters. Change the maximum spec to 4,000 RPM for both parameters.
  3. Start the engine and observe the scan tool.
  4. Quickly accelerate and release the accelerator pedal several times. DO not accelerate pass 4,000 RPM. Two graphed lines on the live plot display should track together across the screen.
  5. Engine running, observe the DTC information with a scan tool. DTCs P0335 or P0336 should not set.
  6. 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.
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