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2. ACTIVE DTC NOTE: Since a hot vehicle can conceal a leak, it is best to perform this test at room temperature. NOTE: A loose gas cap could have caused this DTC to set. Make sure gas cap is tight and in good condi- 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 Perform a visual and physical inspection of the entire Evaporative Emission system. Check for the follow conditions: - Holes or cracks - Loose seal points - Evidence of damaged components - Incorrect routing of hoses and tubes - Fuel Cap 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. VERIFY EVAPORATIVE EMISSION LEAK To continue testing you will need Miller Tool #8404A Evaporative Emission Leak Detector (EELD). WARNING: Keep lit cigarettes, sparks, flames, and other ignition sources away from the test area to prevent NOTE: The fuel tank should have between 20% and 80% of fuel tank capacity to properly test the Evap Block the vent hose of the canister if using the service port. Connect shop air to the EELD. Set the smoke/air control switch to AIR. Insert the tester’s AIR supply tip (clear hose) into the appropriate calibration orifice on the tester’s control panel Press the remote smoke/air start button. Position the red flag on the air flow meter so it is aligned with the indicator ball. When the calibration is complete, release the remote button. The EELD flow meter is now calibrated in liters per Install the service port adapter #8404-14 on the vehicle’s service port and block the vent hose of the EVAP Canister Connect the Air supply hose from the EELD to the service port (if equipped) or to the #8404-ADP adapter. Press the remote button to activate AIR flow. NOTE: Larger volume fuel tanks, lower fuel levels or if the vehicle is equipped with a Flow Management 9 - 456 ENGINE ELECTRICAL DIAGNOSTICS LX |