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DTC P0452: NVLD Pressure Switch Sense Circuit Low: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the EVAP purge solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jumper across the EVAP purge solenoid harness connector. With the DRBIII® scan tool, actuate the EVAP purge solenoid. Does the test light flash on and off? If yes, go to next step. If no, go to step  7.
  3. After disconnecting the EVAP purge solenoid vacuum connections, inspect the lines and solenoid for any signs of contamination from the EVAP canister. This may indicate a faulty rollover valve. Replace/repair as necessary. Turn the ignition off. Disconnect the vacuum hoses at the EVAP purge solenoid. Using a hand vacuum pump, apply 10 in Hg to the "CAN" of the EVAP purge solenoid. Monitor the vacuum gauge for at least 15 seconds. Does the EVAP purge solenoid hold vacuum? If yes, go to next step. If no, replace the EVAP purge solenoid.
  4. Ignition on, engine not running. Using the DRBIII® scan tool, monitor the NVLD switch state. Does the DRBIII® scan tool display the NVLD state OPEN? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  5. Turn the ignition on. Using the DRBIII® scan tool, monitor the NVLD switch state. Disconnect the NVLD assembly electrical connector. Does the switch change from CLOSED to OPEN? If yes, replace the NVLD assembly. If no, go to next step.
  6. Turn the ignition off. Disconnect the NVLD assembly electrical harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K107) NVLD switch signal circuit in the NVLD assembly harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (K107) NVLD switch signal circuit. If no, 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 .
  7. Turn the ignition off. Disconnect the EVAP purge solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K52) EVAP purge solenoid control circuit at the EVAP purge solenoid harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (K52) EVAP purge solenoid control circuit. If no, 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 .
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