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Checking Fuel Tank & Tank Venting System For Leaks With Tank Leakage Diagnosis Module (DM-TL) - Z3

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  1. A fault is indicated by CHECK ENGINE indicator light in instrument cluster lighting up. This may indicate a leak in the tank venting system. Information on this is provided by the fault memory of the DME control unit. Read out fault memory of DME control unit and carry out diagnosis in accordance with faults stored. A leak test with the DM-TL module is then carried out if:
    • The components of the DM-TL module are okay.
    • An error is stored in the DME fault memory (tank leak detected).
  2. Adhere to following conditions in order to carry out a correct leak test:
    • Ensure content of fuel tank is greater than 90 percent.
    • Ensure reserve indicator light is off.
    Leave car in workshop for at least 2 hours so that fuel temperature equals workshop temperature as closely as possible (ideal fuel temperature is about 50-68°F (10-20°C). Do not under any circumstances fill up car with fresh fuel. Check that tank cap is correctly seated.
    WARNING: During leak test, under no circumstances apply external pressurization through tank filler neck as this may cause incorrect readings.
  3. Clear DME fault memory. Using Diagnosis and Information System (DIS), go to FUNCTION AND COMPONENT SELECTION page by selecting COMPLETE VEHICLE, DRIVE, ENGINE MANAGEMENT, TANK SYSTEM TEST, DIAGNOSIS MODULE TANK LEAKAGE (DMTL). Adopt test module in test schedule. Switch to test schedule and implement tank leakage diagnosis module. Leakage test is carried out. If fault is recorded again in DME fault memory (tank leak detected), go to next step and carry out leak test.
    CAUTION: On vehicles with Tank Leak Diagnosis Modules (DM-TL), do not work with external pressurization as the tank venting system will leak under this condition. Because of emerging fuel vapors, carry out all work in well ventilated rooms, or use a suitable extractor system.
    NOTE: Following procedure is only applicable to vehicles with tank leak diagnosis module (DM-TL).
  4. To conduct leak test on fuel tank and tank ventilation system, in Diagnosis and Information System (DIS), go to FUNCTION AND COMPONENT SELECTION page by selecting: SERVICE FUNCTIONS, DRIVE, DIGITAL MOTOR ELECTRONICS AND ACTIVATION DMTL PUMP ADOPT TEST MODULE in test schedule. Switch to test schedule and implement ACTIVATION DMTL PUMP test module.
  5. Tank leak diagnosis pump pressurizes fuel tank and tank venting system. Carry out leak test. Terminate test module after completing leak test. Tank leak diagnosis pump is automatically shut down after about 15 minutes due to risk of overheating. Allow pump to cool down for at least 15 minutes, then continue procedure. Leak test can be carried out with a leak detector. Follow leak test manufacturer's operating instructions. Possible causes of leaks are:
    • Tank cap leaking (check tank cap pressure relief valve). See FUEL CAP PRESSURE RELIEF VALVE TEST  under FUEL EVAPORATION.
    • Tank venting lines leaking (fuel tank, carbon canister, or tank venting valve).
    • Tank ventilation valve leaky (engine compartment).
    • Fuel level sensor flange on tank leaking.
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