EDS Operating Instructions

CAUTION:
When conducting pressurized EVAPS testing the EDS system should not be left unattended.

NOTE:
Temperature differences between a vehicle and the test equipment will give misleading results because the test gases can expand or contract during testing. To avoid inconsistent results, make sure that the vehicle temperature has stabilized to the same temperature as the test equipment.

1. Ensure that the fuel filler cap is properly tightened.

2. Close the EVAPS Canister Vent Solenoid using TestBook (diagnostic disk DRG0002). The screen path is: GEMS NAS, Output Drive, Closure Valve Drive On.

3. If vehicle is equipped with EVAPS service port (Range Rover), connect red EDS hose to service port.





4. If vehicle is not equipped with EVAPS service port (Discovery), install adapter at EVAPS canister and connect red EDS hose to adapter fitting (Figure 2).

5. Open nitrogen cylinder valve.

NOTE:
Elapsed time to fully pressurize the system will vary, depending on the amount of fuel in the tank.

6. Rotate control panel valve to "Pressure" position and pressurize the system to 14.5 in. H2O.

7. Rotate control panel valve to "Off/Hold" position and monitor pressure for two minutes.

8. If pressure drop is below 6 in. H2O over the two minute span test is complete.

9. If pressure drop is greater than 6 in. H2O over the two minutes, rotate control panel valve to "Pressure" and increase pressure to 30 in. H2O.

10. Monitor all system hoses, crimps and welds for leaks using Ultrasonic Leak Detector.

11. Replace any defective parts or tighten connections as required.

12. When repairs are completed, go to step 6 above and test system for leak-down again.