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P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED) 5. NVLD SWITCH OPERATION Connect the previously disconnected vacuum hose. 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 >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 6 6. VERIFY EVAPORATIVE EMISSION LEAK 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 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 EVAP Canister. 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 .040 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 (if equipped) or install the #8404-ADP into the 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. Compare the flow meter indicator ball reading to the red flag. ABOVE the red flag indicates a leak present. BELOW the red flag indicates a sealed system. Is the indicator ball above the red flag? Yes >> Go To 7 No >> Go To 8 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 471 |