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DTC P0453: NVLD Pressure Switch Sense Circuit High: Testing

  1. Start the engine. Allow engine to idle. Using the DRBIII®, 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 stated, and then return to open when the test is complete. Did the NVLD Switch operate as described above? If yes, go to next step. If no, go to step  3.
  2. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
    3. NOTE: NVLD Assembly may also be referred to as a leak detection pump.
  3. Turn the ignition off. Disconnect the NVLD Assembly harness connector. Turn ignition on, engine not running. Measure the voltage between ground and the NVLD Switch Sense circuit at the NVLD Assembly harness connector. Is the voltage above 5.5 volts? If yes, repair the short to battery voltage in the NVLD Switch Sense circuit. If no, go to next step.
  4. Turn the ignition off. Measure the resistance between the NVLD Switch Sense circuit and the NVLD Solenoid Control circuit at the NVLD Assembly harness connector. Is the resistance below 5.0 ohms? If yes, repair the NVLD Switch Sense circuit that is shorted to the NVLD Solenoid Control circuit. If no, go to next step.
  5. Using a jumper wire, jumper across the NVLD Switch Sense circuit and the Ground circuit at the NVLD Assembly harness connector. Using the DRBIII®, monitor the NVLD Switch State. Does the Switch change from open to closed? If yes, replace the NVLD Assembly. If no, go to next step.
  6. Measure the resistance between ground and the Ground circuit at the NVLD Assembly harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the Ground circuit.
    7. 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  7. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the NVLD Sense circuit from the NVLD Assembly harness connector to the appropriate terminal at Miller Special Tool. Is the resistance below 5.0 ohms? If yes, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary. If connectors are okay, replace PCM. Program the new PCM. See PROGRAMMING . If no, repair the open in the NVLD Sense circuit.
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