Air Mass Meter (HLM)

Air Mass Meter (HLM):

Check HLM signal:

•D• 200 - The load signal indicates the air throughput in the HLM. When idling, the value should be 2.0 ms +/- 10%.

Check clear-burn function:

Increase engine speed once to above 2000 rpm (engine temperature >60° C). After shutting down the engine, a voltage increase to approx 3.5 V can be measured at the HLM between terminal 1 (+) and 4 (-).