Fuel Tank Leak Detection Control Module - J909 -, CHECKING: General Description

The system can test the evaporative system integrity by using natural vacuum after the engine is shut off. The Engine Control Module -J623- monitors the ability of the system to maintain vacuum through signals sent from the Fuel Tank Pressure Sensor -G400- and the Fuel Tank Leak Detection Control Module -J909-. If the vacuum remains for a specified period of time, then there are no evaporative leaks, and a PASS is reported by the Engine Control Module -J623-. If there is a leak, the system either will not achieve a vacuum, or a vacuum cannot be maintained. Usually a fault can only be detected after a cold start.

The Fuel Tank Leak Detection Control Module -J909- includes and operates in conjunction with the following component:

• Fuel Tank Pressure Sensor -G400-

The Fuel Tank Leak Detection Control Module -J909- components cannot be serviced separately, and they must be serviced as a unit.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.
• Hand Vacuum Pump.
• Evap Smoke Tester.