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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Air Conditioning Cut Signal Output




Air conditioning cut signal output (if equipped)
ECM (PCM) outputs A/C cut signal to A/C amplifier when any one of following condition is satisfied.
- A/C signal is not inputted from A/C amplifier
- Engine coolant temp. is about 110 °C (230 °F) or higher
- For some seconds after opening throttle valve 71 or more
- Engine speed is lower than 500 r/min. or 6500 r/min. or more