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EMISSION CONTROL 1 FAULT DIAGNOSIS REV: 09/95 TESTING EVAPORATIVE EMISSION CONTROL - The following pressure test procedure is intended to Equipment required. Nitrogen cylinder (compressed air may be used to Water manometer (0 - 30" H2O or more). Pipework and a "T" piece. Method. 1. Ensure that there is at least two gallons of fuel in the petrol tank unless there has never been any 2. Disconnect, at the adsorption canister, the pipe to the vapour separator. 3. Connect this pipe to the nitrogen cylinder and the water manometer using the "T" piece. 4. Pressurize the system to between 26.5 and 27.5 inches of water, allow the reading to stabilize, 5. Measure the pressure drop within a period of 2 minutes 30 seconds. If the drop is greater than 6. Should the system fail the test, maintain the pressure in the system and apply a soap 7. Repeat the test and if successful, dismantle the test equipment and reconnect the pipe to the LEAK DETECTION PROCEDURE - ADVANCED 1. Connect TestBook to the vehicle and confirm that the fault code(s) displayed relate to an 2. Examine components in fuel and EVAP system for damage or poorly connected joints. 3. Repair or replace components to rectify any faults found, then reset the Check Engine light 4. Carry out Drive Cycle, See Drive Cycle - Advanced EVAPS 5. Using TestBook confirm that the Evaporative Loss Control (ELC) Inspection and Maintenance 6. If the IM flag is still shown, use TestBook to interrogate the engine management system to • If a fault code is shown then further investigation • If the IM flag is still shown, but no faults are 7. Connect the Leak Detection/EVAP Diagnostic Station to the vehicle and carry out the 8. Rectify faults indicated by the Leak Detection/EVAP Diagnostic Station and return to |