Fuel Tank Leak Detection Control Module, Checking
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the appropriate System Wiring Diagram.
The following procedure is used to diagnose the Fuel Tank Lead Detection Control Module -J909- which is controlled by Engine Control Module -J623-.
Special tools and workshop equipment required
- multimeter.
- Wiring diagram.
Test requirements
- The Engine Component Power Supply Relay -J757- OK.
- The Fuse -SF2- OK.
- The fuel filter OK.
- The parking brake engaged.
- The battery voltage at least 12.5 V.
- The selector lever of automatic transmission in position "P" or "N".
- All electrical consumers switched off.
- A/C switched off.
- The fuel tank at least 1 /4 filled.
- The ignition switched off.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK.
Start diagnosis
-- Remove the left rear underbody cover.
-- Disconnect the Fuel Tank Lead Detection Control Module -J909- electrical harness connector. -at #3-
Checking voltage
Crank the engine.
-- Using a multimeter, check the Fuel Tank Lead Detection Control Module -J909- electrical harness connector terminal 1 to Ground (GND) for voltage.
Specified value: battery voltage.
-- Switch the ignition off.
If the specified value was not obtained:
-- Check the wiring from the Fuel Tank Lead Detection Control Module -J909- electrical harness connector terminal 1 to the Fuse 2 (on fuse panel F) -SF2- for an open circuit or a short circuit to Ground (GND).
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking wiring connections
If the manufacturers test box is being used, perform the following step.
-- Install the test box.
If the manufacturers test box is not being used, perform the following step.
-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to appropriate Service Information.
-- Using a multimeter, check the Fuel Tank Lead Detection Control Module -J909- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for resistance.
| Fuel Tank Lead Detection Control Module -J909- electrical harness connector terminal | Engine Control Module (ECM) -J623- electrical connector T94 terminal or test box socket |
|---|---|
| 2 | 54 |
| 3 | 52 |
Specified value: 1.5 Ω Max.
If the specification was not obtained:
-- Check the wiring for an open circuit, a short circuit to each other, Battery (+) or Ground (GND).
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY.
-- Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. Refer to READINESS CODE.
-- End diagnosis.
If the DTC returns and no malfunction is found in the wiring and voltage supply was OK:
-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to appropriate Service Information.
Assembly is performed in the reverse order of the removal, note the following:
Final procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY.
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY.
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE.