Operation CHARM: Car repair manuals for everyone.
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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Input Signals



Input signals
1 = Idle detection
2 = Full load detectn.
3 = ACS switch.

< Input signals
1 = A/C compressor
2 = Signal heating
3 = Reference mark

< Input signals
1 = Fuel reserve.

This menu can be used to poll the status of input signals.
For idle speed and full load detection, the engine must be running.

Signal heating
The heating/air conditioning controller transmits a signal to the DME/ECM if the temperature mixing valves are more than 90% open in order to prevent coasting shutoff.