Misfire or Rough Running

Check in the Order Listed:

1. Fuel Supply
a. Manifold Absolute Pressure (MAP) Sensor
b. Fuel Injector (code 16)
c. Pressure Regulator
d. Idle Air Control (IAC) Valve
2. TDC/CRANK/CYL Position Sensor (code 4,8,9)
3. Exhaust Gas Recirculation (EGR) [1] Control System (code 12)
4. Engine Control (ECM) Module (BU)

NOTE:
(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.

Self-diagnosis indicator, (MALFUNCTION INDICATOR WARNING LAMP) blinks (?), will follow associated systems.

[1] Only applies to Vehicles with EGR Valves.