Computers and Control Systems: Description and Operation
Control SystemGENERAL DESCRIPTION
The ECM receives signals from various sensors, switches, and other control modules. Using these signals, it determines the engine operating conditions and it necessary, emits signals to one or more systems to control them for optimum operation.
Major control items of the ECM are as follows:
- Fuel injection control
- Ignition system control
- Idle air control
- Fuel pump control
- Canister purge control * 1
- GRadiator fan control * 2
- On-board diagnosis function
* 1: Canister purge control is described under "Emission Control (Aux. Emission Control Devices) Evaporative Emission Control System".
* 2: Radiator fan control is described under "Cooling".