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P0452-NVLD PRESSURE SWITCH STUCK CLOSED (CONTINUED) 3. EVAP PURGE SOLENOID LEAKS/STUCK OPEN Turn the ignition off. Connect the Evap Purge Solenoid harness connector. Disconnect the vacuum hoses at the Evap Purge Solenoid. NOTE: After disconnecting the Evap Purge Solenoid vacuum connections, inspect the lines and solenoid for 9 CAN 9 of the EVAP Purge Solenoid. NOTE: Monitor the vacuum gauge for at least 15 seconds. Does the EVAP Purge Solenoid hold vacuum? Yes >> Go To 4 No >> Replace the Evap Purge Solenoid. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 4. NVLD SWITCH OPERATION Ignition on, engine not running. Using the scan tool, monitor the NVLD Switch State with the vacuum pump still installed and holding vacuum. Does the scan tool display the NVLD state OPEN? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 NOTE: Remove the vacuum pump and connect the vacuum hose before continuing. 5. NVLD ASSEMBLY Disconnect the NVLD electrical connector. Does the Switch change from CLOSED to OPEN? Yes >> Replace the NVLD Assembly. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 6 9 - 490 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |