Control System

* SFI system

The SFI system monitors the engine condition through the signals received from the various sensors by the engine control module. Control signals are then output from the engine control module TERMINALS #10, #20, #30 and #40 to operate the injectors (Fuel injection). The SFI system controls the fuel injection via the engine control module according to the driving conditions.

* ESA system

The ESA system monitors the engine condition through the signals received from various sensors by the engine control module. The best ignition timing is determined according to this data and the data stored in the engine control module. Control signals are then output from TERMINALS IGT1, IGT2, IGT3 and IGT4, and these signals control the igniters to provide the best ignition timing.

* Heater control system of heated oxygen sensor

The heater control system of heated oxygen sensor turns the heater on when the intake air volume is low (Exhaust emissions temperature is low), and warms up the heated oxygen sensors to improve their detecting performance. The engine control module evaluates the signals from each of the sensors, and outputs current to TERMINAL HT1B to control the heater.

* Heater control system of air fuel ratio sensor

The heater control system of air fuel ratio sensor turns the heater on when the intake air volume is low (Exhaust emissions temperature is low), and warms up the air fuel ratio sensor to improve detecting performance of the sensor. The engine control module evaluates the signals from the sensor, and current is output to TERMINAL HA1A, controlling the heater.

* Fuel pump control system

The engine control module supplies current to TERMINAL FC, and controls the operation of the fuel pump with the C/OPN relay.

* VVT-i

The VVT-i system optimizes the intake camshaft valve timing in accordance with the engine conditions.

* CHS system

The engine control module controls the CHS W/P relay to run the electric pump to supply heated water stored in the CHS tank to the engine head. The electric pump stops when the water reaches a certain temperature or a certain amount of time goes by. Warming the engine head optimizes combustion conditions when the engine is starting, in order to reduce the emission of incomplete combustion gas.