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DTC P0452: NVLD Pressure Switch Sense Circuit Low: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs and record related Freeze Frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  8.
  2. Turn the ignition off. Disconnect the EVAP Purge Solenoid harness connector. Turn ignition on, engine not running. Using a 12-volt test light, jumper across the EVAP Purge Solenoid harness connector. With the DRBIII®, 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. Disconnect vacuum hoses at EVAP Purge Solenoid. Inspect hoses and solenoid for any signs of contamination from the EVAP canister. This may indicate a faulty rollover valve. Repair or replace as necessary. Using a hand vacuum pump, apply 10 in. Hg of vacuum to the EVAP Purge Solenoid vacuum source port (CAN port on component side). Monitor vacuum 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. Turn ignition on, engine not running. Using the DRBIII®, monitor the NVLD Switch State. Does the DRBIII® display the NVLD state open? If yes, go to step  8. If no, go to next step.
  5. Turn the ignition off. Using the DRBIII®, monitor the NVLD Switch State. Disconnect the NVLD Assembly harness connector. Does the Switch change from closed to open? If yes, replace the NVLD assembly. If no, go to next step.
  6. Ensure the ignition is off. Disconnect the PCM harness connectors. Measure the resistance between ground and the NVLD Switch Sense circuit in the NVLD Assembly harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the NVLD Switch Sense circuit. If no, 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 .
    7. NOTE: The EVAP Purge Solenoid Control circuit may also be referred to as EVAP Emission Solenoid Control circuit.
  7. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the EVAP Purge Solenoid Control circuit in the EVAP Purge Solenoid harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the EVAP Purge Solenoid Control circuit. If no, 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 .
  8. 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.
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