A/C Signal: Description and Operation

Air Conditioning (A/C) Signal (Vehicle with A/C only)
This signal is sent from the A/C amplifier. The A/C amplifier outputs this signal to ECM when A/C ON conditions are satisfied on the A/C amplifier side. (The air conditioner does not turn ON in this state.) When ECM detects through the A/C signal that A/C ON conditions are satisfied on the A/C amplifier side, it uses the A/C signal as one of the factors to output A/C ON signal and to control idle air control valve.





Air Conditioning on Signal Output for A/C Amplifier
ECM outputs A/C ON signal (one of the signals for A/C amplifier to control the air conditioner) to A/C amplifier when A/C signal inputted to ECM and conditions listed below are satisfied.
- Throttle valve opening: below 65°
- Engine coolant temp. : below 11O°C (230°F)
- Engine speed : between 5O0 r/min and 6,600 r/min.