Computers and Control Systems: Description and Operation

GENERAL DESCRIPTION
The Multiport Fuel Injection System consists of sensors, actuators and the engine control module (ECM) or powertrain control module (PCM) . The sensors detect the engine condition. The module controls the system based on signals from these sensors. The actuators work under the control of the ECM (or PCM).

The ECM (or PCM) carries out activities such as fuel injection control, idle air control, and ignition timing control. In addition, the ECM (or PCM) has several diagnostic test modes which simplify troubleshooting when a problem develops.

In addition, the ECM (or PCM) is equipped with several diagnostic test modes which simplify troubleshooting when a problem develops.

DIAGNOSTIC TEST MODE
- When a fault is detected in any of the sensors or actuators related to emission control, the SERVICE ENGINE SOON/MALFUNCTION INDICATOR LAMP illuminates to warn the driver.
- When a fault is detected in one of the sensors or actuators, a diagnostic trouble code corresponding to the fault is scored in the ECM (or PCM).
- The RAM data inside the ECM (or PCM) that is related to the sensors and actuators can be read with the scan tool.
In addition, the actuators can be controlled by the scan tool MUT-II (MB991502) under certain circumstances.