Checking the idle speed increase system [Toyota Corona T190]

1. Warm up the engine to operating temperature.

2. Set the air conditioner switch to the "OFF" position.

3. Check the idle speed increase system.

• a) Turn the steering wheel all the way.
• b) Check that the rotation speed decreases when the valve hose is pinched.
• c) Check that the rotation speed increases when the hose is not pinched.