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3. CHECKING EVAP PURGE SOLENOID FUNCTIONALITY NOTE: After disconnecting the Evap Purge vacuum connections, inspect the lines and solenoid for any 9 CAN 9 side of the EVAP Purge Solenoid. Ignition on, engine not running. Observe the vacuum gauge. With the scan tool, actuate the EVAP Purge Solenoid. Does the vacuum drop when the solenoid is actuated? Yes >> Go To 4 No >> Replace the Evap Purge Solenoid. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NOTE: Remove the vacuum pump before continuing. 4. EVAP VACUUM SUPPLY HOSE INSPECTION Turn the ignition off. Carefully inspect the Evap Purge Solenoid vacuum supply hose for proper routing. Check for a pinched or plugged hose from the throttle body or intake manifold to the Purge Solenoid. Inspect the vacuum port at the throttle body or intake manifold for any damage or plugging. Were any problems found? Yes >> Repair the vacuum supply hose/tube as necessary. Perform the POWERTRAIN VERIFICATION TEST. No >> Go To 5 Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 5. NVLD SWITCH OPERATION CAUTION: Do not attempt to probe the NVLD Terminals to diagnose the switch function. This may damage Start the engine. Allow the engine to idle. Using the scan tool, perform the NVLD FORCED MONITOR TEST. Monitor the NVLD Switch state. NOTE: As the test runs, the NVLD Switch should go from an OPEN state to a CLOSED state and then return Did the NVLD Switch operate as described above? Yes >> Test complete. No >> Go To 6 9 - 342 ENGINE ELECTRICAL DIAGNOSTICS KJ |