Control System

* SFI system

The SFI system monitors the engine conditions through the signals received from all of the sensors by the engine control module. Then a control signal is then sent from the engine control module TERMINALS #10, #20, #30, #40, #50 and #60 to operate the injectors (Fuel injection). The SFI system controls the fuel injection via the engine control module in response to the driving conditions.

* ESA system

The ESA system monitors the engine condition through the signals received from all of the sensors by the engine control module. The best ignition timing is determined according to this data and the data already stored in the engine control module. Then a control signal is output from TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5 and IGT6, and these signals control the igniters to provide the best ignition timing.

* Heated oxygen sensor heater control system

The heated oxygen sensor heater control system turns the heater on when the intake air volume is low (Temperature of exhaust emissions is low), and warms up the heated oxygen sensors to improve their detection performance. The engine control module evaluates the signals from each sensors, and outputs current to TERMINAL HT1B or HT2B to control the heater.

* Air fuel ratio sensor heater control system

The air fuel ratio sensor heater control system turns the heater on when the intake air volume is low (Temperature of exhaust emissions low), and warms up the air fuel ratio sensor to improve the detection performance of the sensor.

The engine control module evaluates the signals from each sensor, and current is output to TERMINALS HA1A and HA2A, controlling the heater.

* Fuel pump control system

The engine control module supplies current to TERMINAL FPR, and controls the operation speed of the fuel pump with the FUEL PUMP relay.

* ACIS

The ACIS includes a valve in the bulkhead separating the surge tank into two parts. This valve is opened and closed in accordance with the driving conditions to control the intake manifold length in two stages, for increased engine output in all ranges from low to high speeds.

* ETCS-i

The ETCS-i optimizes the engine output in accordance with the opening of the accelerator pedal, under all driving conditions.

* VVT-i

Optimizes the intake camshaft timing in accordance with the engine condition.