Explanation
Not all the parameters described need to be implemented in the control module. This varies from system to system.
Frozen values are parameter values that are stored when a diagnostic trouble code (DTC) is stored.
Bank 1 indicates cylinders 1-3 on 6 cylinder engines and all cylinders on 5-cylinder engines.
Bank 2 indicates cylinders 4-6 on 6-cylinder engines.
Condition, fuel trim bank X
Fuel trim can assume 5 different conditions
- no fuel trim, the start conditions have not been met. . This condition occurs at the crank or immediately after start before fuel trim has started
- fuel trim with 2 probes . This situation occurs during driving when both probes are used during fuel trim (part load).
- no fuel trim, operation with predefined values . This situation occurs during hard acceleration or during fuel shut-off when there is no fuel trim and operation is under predefined values.
- no fuel trim, operation with system fault . This situation occurs when an earlier diagnostic trouble code (DTC) was stored that caused the fuel trim to be disabled
- fuel trim with one probe (front) . This situation occurs at idling speed or during light acceleration when one probe (front) is used during fuel trim.
Calculated load, %
Indicates the calculated engine load. The value is given as a percentage of full load.
Engine coolant temperature (ECT), °C
Indicates the engine temperature. The value is given in °C.
Engine speed, RPM
Indicates the engine speed (RPM). The value is given in RPM
Vehicle speed, km/h
Indicates the vehicle speed. The value is given in km/h.
Boost pressure
Indicates the engine volumetric efficiency. The value is given as a % compared to the atmospheric pressure (during positive boost pressure the value will be higher than 100%).
Battery voltage
Indicates the system voltage. The value is given in volts.
Throttle angle
Indicates the throttle angle. The value is given as a percentage of maximum reading.
Air mass
Indicates the mass air flow. The value is given in kg/h.
Outside temperature
Indicates the outside temperature. The value is given in °C.
Distance
Indicates the mileage when the diagnostic trouble code (DTC) was stored. The value is given in km.
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.
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.
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.