Rough Idle

SYMPTOM: Rough Idle

CHECK
1. Electronic Control Unit (**)
2. Electronic Air Control Valve (14)
3. Fuel Injectors
4. Manifold Absolute Pressure Sensor (3) (5)
5. Positive Crankcase Ventilation System [Manual Transmission]
6. Exhaust Gas Recirculation System [Automatic Transmission]
7. Positive Crankcase Ventilation System [Automatic Transmission]

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. Notes on Reading Diagnostic List For ECU trouble code component testing procedures see Computers and Control Systems.