Fuel Tank Leak Detection Control Module - J909-, CHECKING

Function

The system can test the evaporative system integrity by applying a vacuum signal, ported or manifold, to the fuel tank in order to create a small vacuum. The Engine Control Module -J623- then monitors the ability of the system to maintain the vacuum through signals sent from the Fuel Tank Pressure Sensor -G400- / 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.

Special tools and workshop equipment required

Multimeter
Wiring Diagram
Scan Tool

Test requirements

Fuses OK.
Battery voltage OK.
Switch OFF All electrical and electronic accessories.
Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
Vehicles with Manual Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions: .
View clean working conditions: .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers concern. Refer to . -- Was Complaint verified?	YES: GO TO Step 2 Fuel Tank Leak Detection Control Module - J909-, CHECKING => 2 . NO: GATHER more information from customer about the concern.
2	IGNITION: ON. DISCONNECT: Fuel Tank Leak Detection Control Module -J909 - harness connector. CHECK: Fuel Tank Leak Detection Control Module -J909 - harness connector terminal 1 to ground for voltage. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- Was Value obtained?	YES: GO TO: Step 3 Fuel Tank Leak Detection Control Module - J909-, CHECKING => 3 . NO: CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. REPLACE: Any open fuses. GO TO: Step 4 Fuel Tank Leak Detection Control Module - J909-, CHECKING => 4 .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate repair Service Information. CHECK: Fuel Tank Leak Detection Control Module -J909 - harness connector terminal 2 to the Engine Control Module - J623- harness connector T94 / 54 for resistance. CHECK: Fuel Tank Leak Detection Control Module -J909 - harness connector terminal 3 to the Engine Control Module - J623- harness connector T94 / 52 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	YES: REPLACE: Fuel Tank Leak Detection Control Module -J909 -. Refer to appropriate repair Service Information. GO TO: Step 4 Fuel Tank Leak Detection Control Module - J909-, CHECKING => 4 . NO: CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4 Fuel Tank Leak Detection Control Module - J909-, CHECKING => 4 .
4	Final Procedure Perform a road test to verify repair. Do any DTCs return:	YES: FAULT DOES RETURN: REPLACE: Engine Control Module - J623-. Refer to appropriate repair Service Information. FAULT DOES NOT RETURN: Check the DTC memory. Refer to . Perform the diagnostic procedure for that DTC. NO: REPAIR is complete. Generate readiness code. Refer to . Return vehicle to Customer.