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Idle Control System

NOTE: See IDLE SPEED CONTROL (ISC) SOLENOID test procedures under SOLENOIDS. Curb idle and fast idle speed is controlled by ECA and is not adjustable. Some throttle bodies have a sludge-tolerant design with a special coated throttle bore. A Yellow/Black warning decal on these units warns against backing off throttle plate adjustment screw to avoid throttle plate sticking in bore. Faults in idle control system components or circuit should set a service code. See Quick Test procedure in TESTS W/CODES article in the ENGINE PERFORMANCE Section.
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