Control System: General

The ECM receives signals from various sensors, switches, and other control modules. Using these signals, it determines the engine operating conditions and if necessary, emits signals to one or more systems to control them for optimum operation.

Major control items of the ECM are as follow:

• Fuel injection control
• Ignition control
• Idle air control
• Canister purge control  1
• Radiator fan control  2
• Fuel pump control
• On-board diagnosis function

1. Canister purge control is described under Emissions. *Refer to PURGE CONTROL SOLENOID VALVE , Evaporative Emission Control System.
2. Radiator fan control is described under Cooling. *Refer to RADIATOR MAIN FAN SYSTEM .