Irregular Idle

SYMPTOM: Fast Idle Out Of Spec When Cold

CHECK
1. Electronic Control Unit (**)
2. Electronic Air Control Valve (14)
3. Other Idle Controls
4. Coolant Temperature Sensor (6)

Numbers in parentheses are the blink codes displayed on back of the ECU.
(**) LED on the ECU is not on, or stays on without blinking. See NOTES ON READING DIAGNOSTIC LIST Article for more information.
For ECU trouble code component testing procedures see Computers and Control Systems.