Computerized Engine Controls: Notes

NOTE: Engine Control Module (ECM) may also be referred to as Powertrain Control Module (PCM).

All models use a Multiport Fuel Injection (MFI) system. MFI system consists of sensors which detect engine conditions. The ECM controls the system based on signals from these sensor and from actuators which operate under the control of the ECM. ECM controls fuel injection, idle speed, ignition timing, emission controls and other functions. ECM is equipped with several diagnostic test modes which simplify troubleshooting when a problem occurs.