Idle speed control valves are responsible for providing a fast idle from cold start to ensure an engine warms up quickly. They also allow the ECU to increase engine RPM should a large load be applied by say the power steering pump, Air Conditioning compressor or even if the alternator is having to produce a high output.

In this video I cover the removal, inspection, resting and operation of a Toyota rotary type Idle Speed Control Valve. These are very common unit used on may Japanese vehicles. There are actually quite reliable as a unit but do become contaminated by dirt over time. They are also a possible source of an internal coolant system leak, often very difficult to detect too...

If you have any questions or comments then please add them below.

Andy Mechanic.