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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A/C Signal: Description and Operation
On models equipped with air conditioning, the
A/C signal informs the ECM that the A/C switch is turned "ON" and the A/C pressure cycling switch is closed. With this input, the ECM will raise
idle speed by means of the
fast idle solenoid. This system prevents poor idle quality and possible stalling due to the extra load created by the A/C compressor.