Check fuel delivery rate of the metering pump
This function is used to check the metering pump's fuel delivery rate to the auxiliary/parking heater.
Note:
Cleanliness and safety precautions must be observed when working with open fuel circuits.
A higher ambient temperature may lead to malfunctions during measurement of the fuel amount due to fuel evaporation.
Test condition:
Coolant temperature below 30 °C.
Ambient temperature below 25 °C.
Fuel level at least 1/4.
Battery voltage above 12V.
No faults stored in the instrument, climate, auxiliary/parking heater or the diagnostic interface for data bus control unit.
Fuel line disconnected from the heater.
Measuring glass.
Procedure:
Start the function and follow the instructions in the program.
Connect the disconnected fuel line to a measuring glass.
Test conditions are checked.
Press "OK" to activate the metering pump.
The metering pump is now activated for 30 seconds to fill the fuel line.
Empty the measuring glass and connect it again.
In the next step, the metering pump will be activated for about 240 seconds.
Measure the amount of fuel in the measuring glass. Desired value approx. 22-28 ml.
When the activation is complete press "OK" to exit the function.
Reconnect the fuel line to the heater unit.
If the function fails, check the test conditions and repair any faults.