Control System

* SFI system

The SFI system monitors the engine condition through the signals received from various sensors by the ECM. Control signals are sent from ECM TERMINALS #10, #20, #30, #40, #50 and #60 to operate the fuel injector assembly (Fuel injection). The SFI system controls the fuel injection for the ECM in response to the driving conditions.

* ESA system

The ESA system monitors the engine condition through the signals received from various sensors by the ECM. The best ignition timing is determined according to this data and the data stored in the ECM. Control signals are then sent from TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5 and IGT6, and these signals control the ignition coil assembly (Igniter) to provide the best ignition timing.

* Oxygen sensor heater control system

The oxygen sensor heater control system turns the heater on when the intake air volume is low (exhaust emissions temperature is low), and warms up the oxygen sensors to improve their detection performance. The ECM evaluates the signals from each sensor and outputs current from TERMINALS 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 (exhaust emissions temperature is low), and warms up the air fuel ratio sensor to improve the detection performance of the sensor.

The ECM evaluates the signals from each sensor and current is output from TERMINALS HA1A and HA2A, controlling the heater.

* 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 accelerator pedal opening, under all driving conditions.

* Dual VVT-i

Dual VVT-i controls the intake and exhaust valve timing to the most appropriate levels in accordance with the ECM.