Description Of Parameters, Quick Test Of The Fuel Tank System

Description of parameters, quick test of the fuel tank system

Conditions

ECU power supply (V)
The value indicates the voltage supply from the system relay to the engine control module (ECM).

Atmospheric pressure (Pa)
The value indicates the ambient pressure. The Engine control module (ECM) receives a signal from the atmospheric pressure sensor.

Hint: The sensor is integrated in the Engine control module (ECM).

Fuel level (l)
The value shows the fuel level in the tank. The Engine control module (ECM) receives a signal from fuel level sensor.

Hint: The sensor is connected to the Central electronic module (CEM) and information is sent to the Engine control module (ECM) via CAN.

Ambient temperature (°C)
The value indicates the ambient temperature. The Engine control module (ECM) receives a signal from the outside temperature sensor.

Hint: The sensor is connected to the Central electronic module (CEM) and information is sent to the Engine control module (ECM) via CAN.

Test status

Fuel tank system quick test
Shows the current status of the quick test (In progress/Not in progress)

Test phase
Shows the current phase of the leak diagnosis. For more information, see "Test phases, quick test tank system".

Fuel tank pressure (Pa)
The value indicates the calculated tank pressure. The Engine control module (ECM) calculates the average pressure with the help of the measured power consumption on the leak diagnostic unit's pump. The pressure will rise from 0 Pa to approx. 4500 Pa during the test.

Hint: The calculated pressure can differ from the measured pressure by ±15 %. This is normal.

Test result

DMTL, test result
Shows the test result on the leak diagnostic unit (DMTL).
If "Fault found" is shown, the Engine control module (ECM) has generated a diagnostic trouble code (DTC) for the fault. Fault tracing should be started/continued.

Tank system, test result
Shows the test result for the fuel tank system.
If "Minor leak found" or "Major leak found" is shown the Engine control module (ECM) has generated a diagnostic trouble code (DTC) for the fault. Fault tracing should be started/continued.

Estimated leak (mm)
The value shows the diameter of the leak. The Engine control module (ECM) calculates the diameter with the help of measurements made during testing.

Hint: The parameter should be used to get an understanding of how close to the diagnostic trouble code limit the system is. If the estimated size of the leak is very close to the diagnostic trouble code limit, fault tracing should probably be carried out despite the test result for the tank system showing "No leakage found", especially if the diagnostic trouble code (DTC) for leakage was initially generated.