Electronic Control Unit (Control System)

The ECU receives signals from various sensors and switches, including the radiator fan control relay and the coolant temperature sensor. An input signal is sent from the coolant temperature sensor to the ECU. The ECU then analyzes the engine operating condition and sends an output signal to the radiator fan control relay to turn ON or OFF. Major items controlled by the ECU are as follows:

• Fuel Injection Control
• Ignition System Control
• By-Pass Air Control
• EGR control
• Canister Purge Control
• Radiator Fan Control
• Engine Torque Control
• Air Conditioner Cut Control
• Self-Diagnosis Function