Rough Idle

Check in Order Listed

1. Idle Air Control Valve (IAC) (code 14)
2. Idle Control System
a. Hoses and Connections
3. Emission Control System
a. Positive Crankcase (PCV) Ventilation System
4. Fuel Supply System
a. Fuel Injectors
b. Contaminated Fuel
5. Manifold Absolute Pressure (MAP) Sensor (code3, 5)
6. Engine Control Module (ECM) (BU)

Back-up (BU) code used when the MALFUNCTION INDICATOR WARNING LAMP is on. Jump the service check connector, if no code is displayed (MALFUNCTION INDICATOR WARNING LAMP stays on steady), the back-up system is in operation.

NOTE: On Canadian models the MALFUNCTION INDICATOR WARNING LAMP is the CHECK ENGINE LAMP.