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Where is the problem if the idle speed remains unchanged when the air conditioner is turned on?

1 Answers

LaFinn

07/30/25 2:19am

There are several reasons for unstable idle speed when the air conditioner is turned on: 1. Engine control logic error: Unable to receive the signal that the air conditioner is turned on. When unable to determine whether the air conditioner is turned on, the engine control unit (ECU) will mistakenly assume it is a temporary high load and attempt to increase the speed to offset the resistance at idle. 2. Air conditioner control circuit error: Unable to send the signal that the air conditioner is turned on. Similar to the first point, because the air conditioner's on/off status cannot be determined, the ECU will continuously adjust the idle speed, resulting in unstable idle. 3. Air conditioner circuit failure: Causes intermittent operation of the air conditioner. When the air conditioner is not working, the air conditioner compressor belt is idling without load, so it will not affect the engine load. The intermittent operation of the air conditioner compressor causes the engine to continuously adjust the idle speed, resulting in unstable idle.

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