Engine Control Module: Description and Operation

Deceleration Control System:

The deceleration control system cuts fuel delivery under certain conditions. The components of the deceleration system that are computerized engine control system related are the engine control unit (ECU), idle switch, water thermosensor, brake light switch, and neutral/clutch switch (MTX only).
The ECU receives inputs from the sensors and cuts the fuel injection signal to the injectors. The idle switch detects when the throttle valves are closed and sends a signal to the ECU. The idle switch is installed on the throttle body. The water thermosensor detects the engine coolant temperature and sends a signal to the ECU. The brake light switch detects braking operation (deceleration) and sends a signal to the engine control unit. The neutral and clutch switches detect when the vehicle is in gear and the clutch is engaged. These switches send signals to the ECU.