Fuel Tank Leak Detection Control Module -J909-, Checking

The following procedure is used to diagnose the Fuel Tank Leak Detection Control Module -J909-.

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Prior to repair work, perform a preliminary check to verify the condition. Refer to. PRELIMINARY CHECK

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements

• Fuse is OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched off.
• Vehicles with automatic transmission, shift selector lever into position "P" or "N".
• A/C switched off.
• Ground (GND) connections between engine/transmission/chassis OK.
• Coolant Temperature at least 80° C.
• Ignition switched off.

Start diagnosis

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

-- Disconnect the Fuel Tank Leak Detection Control Module -J909- electrical harness connector.

Checking voltage supply

-- Using a multimeter, check the Fuel Tank Leak Detection Control Module -J909- electrical harness connector terminal 4 to engine Ground (GND) for voltage.

-- Switch the ignition on.

Specified value: battery voltage.

-- switch the ignition off.

If specified value was not obtained:

Checking electrical circuit

-- Remove the Engine Control Module 2 -J624-. Refer to Repair Information.

-- Using a multimeter, check the Fuel Tank Leak Detection Control Module -J909- electrical harness connector terminals to the Engine Control Module 2 -J624- electrical harness connector T94a terminals for an open circuit.

Fuel Tank Leak Detection Control Module -J909- electrical harness connector T5p terminals:	Engine Control Module 2 -J624- electrical connector T94a terminals:
2	26
3	50
4	Engine Control Module 2 -J624- fuse. Refer to the appropriate wiring diagram.

Specified value: 1.5 Ω max.

If the specification was not obtained:

-- Check the wiring for a short circuit to each other, Battery voltage, and Ground (GND).

-- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:

-- Replace Fuel Tank Leak Detection Control Module -J909-. Refer to Repair Information.

If no malfunction is detected in the wiring and if the voltage supply was not OK:

-- Replace the Motronic Engine Control Module 2 -J624-. Refer to Repair Information.

-- Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .