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Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.4L - DTC P0196 To P0496 >> DTC P0366 or P0391 >> Circuit/System Testing
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Circuit/System Testing

  1. With the ignition OFF, inspect the engine wiring harnesses carrying the CMP sensor circuits for the following conditions:
    • Close routing of secondary ignition wires
    • 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. Remove the affected CMP sensor. Inspect the CMP sensor and the camshaft actuator reluctor wheel for the following conditions.
    • Incorrect sensor installation
    • A cracked or damaged sensor
    • The sensor coming in contact with the reluctor wheel
    • Excessive air gap between the reluctor wheel and the sensor
    • Foreign material passing between the sensor and the camshaft reluctor wheel
    • Camshaft reluctor wheel damage
    • If you find a condition with the CMP sensor or the camshaft reluctor wheel, repair as necessary.
    • If a condition is not found replace the affected CMP sensor.
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