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DTC P0453: NVLD Pressure Switch Sense Circuit High: Testing

  1. Start the engine. Allow the engine to idle. Using the DRBIII® scan tool, perform the NVLD FORCED MONITOR TEST. Monitor the NVLD switch state. As the test runs, the NVLD switch should go from an OPEN state to a CLOSED state and then return to OPEN when the test is complete. Did the NVLD switch operate as described above? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Disconnect the NVLD assembly electrical harness connector. Ignition on, engine not running. Measure the voltage on the (K107) NVLD switch signal circuit in the NVLD assembly electrical harness connector. Is the voltage above 5.5 volts? If yes, repair short to battery voltage in the (K107) NVLD switch signal circuit. If no, go to next step.
  3. Turn the ignition off. Disconnect the NVLD assembly electrical harness connector. Measure the resistance between the (K107) NVLD switch signal circuit and (K106) NVLD solenoid control circuit in the NVLD assembly electrical harness connector. Is the resistance below 5.0 ohms? If yes, repair the (K107) NVLD switch signal circuit shorted to the (K106) NVLD solenoid control circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the NVLD assembly electrical harness connector. Using a jumper wire, jumper across the NVLD switch signal circuit and the ground circuit in the NVLD assembly, electrical harness connector. Monitor the NVLD switch state on the DRBIII® scan tool. Does the switch change from OPEN to CLOSED? If yes, replace the NVLD assembly. If no, go to next step.
  5. Turn the ignition off. Disconnect the NVLD assembly electrical harness connector. Measure the resistance between the (Z1) ground circuit and ground. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (Z1) ground circuit.
    6. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  6. Turn the ignition off. Disconnect the NVLD assembly electrical harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K107) NVLD switch signal circuit from the NVLD electrical harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING . If no, repair the open in the (K107) NVLD switch signal circuit.
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