Misfire or Rough Running

Check:

1. Fuel Supply
a. Fuel Injector (16)
b. Pressure Regulator
c. Contaminated Fuel
2. Electronic Air Control Valve (EACV) (14)
3. Exhaust Gas Recirculation (EGR) System (12) (CAL: A/T only)
4. Electronic Control (ECU) Unit (BU)

NOTE:
After each symptom, the system that could be the source of the symptom are listed and should be checked in the order they are listed, beginning with #1.

(BU) code used when the CHECK ENGINE warning light is on, and the self-diagnosis indicator LED is ON with no "blinks", the back-up system is in operation.

Self-diagnosis indicator, (LED) blinks (?), will follow associated systems.