Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Air Flow Meter (HLM)

Check HLM signal:
[D] 200 - The load signal provides an indication of the measured air flow rate in the HLM. The value should be 2.0 ms ± 10 % when idling.

Check burn-off function:
Increase engine speed once above 2000 rpm (engine temperature > 60 °C), after stopping the engine, a voltage increase of approx. 3.5 V can be measured at the HLM between Pin 1 (+) arid Pin 5 (-).