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2. ACTIVE DTC NOTE: If any of the following DTCs are set (P0443, P0452, P0453, P0498, or P0499) diagnose them first NOTE: A loose gas cap could have caused this DTC to set. Make sure the gas cap is tight and in good With a scan tool, read DTCs. Is the DTC active at this time? Yes >> Go To 3 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 3. VISUAL AND PHYSICAL INSPECTION Turn the ignition off. Perform a visual and physical inspection of the entire Evaporative Emission system. Check for the following conditions: - Hoses disconnected or left off - Holes or cracks - Loose seal points - Evidence of damaged components - Incorrect routing of hoses and tubes - Fuel Cap left off or bad gasket seal Were any of the above conditions found? Yes >> Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 4 4. EVAP VACUUM SUPPLY HOSE INSPECTION 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. Make sure the vacuum port at the throttle body or intake manifold is free from any blockage. Were any problems found? Yes >> Repair the vacuum supply, hose/tube as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 5. CHECKING EVAP PURGE SOLENOID FUNCTIONALITY NOTE: To continue testing you will need Miller Tool #8404 Evaporative Emission Leak Detector (EELD). WARNING: Keep lit cigarettes, sparks, flames, and other ignition sources away from the test area to prevent Disconnect the vacuum hoses at the Evap Purge Solenoid. Connect the SMOKE supply tip (black hose) to the “CAN” port on the Evap Purge Solenoid. Set the smoke/air control switch to SMOKE. 9 - 334 ENGINE ELECTRICAL DIAGNOSTICS KJ |