The picture below provides
Air Conditioning Compressor Signal (A/C) and Electrical Load Signal (ELS) Circuit Diagram for particularly Toyota
cars. The A/C signal used to determine when the air conditioning compressor is
loading the engine.
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The ELS circuit signals electrical load on the charging system so that the
ECU uses the information needed for maintaining a stable idle speed.
(source: http://www.hqew.net/circuit-diagram)
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