Control System

* SFI system

The SFI system monitors the engine condition through the signals received from various sensors by the ECM. Then control signals are sent from the ECM TERMINALS #10, #20, #30, #40, #50, #60, #70 and #80 to operate the fuel injector assembly (Fuel injection). The SFI system controls the fuel injection by 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. Then control signals are output from TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 and IGT8, and these signals control the igniters 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 (Temperature of exhaust emissions is low), and warms up the oxygen sensors to improve their detection performance. The ECM evaluates the signals from each sensor, and outputs current to 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 (Temperature of exhaust emissions is low), and warms up the air fuel ratio sensor to improve detection performance of the sensor. The ECM evaluates the signals from each sensor, and current is output to 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.

* VVT-i

VVT-i controls the intake valve timing to the most appropriate levels in accordance with the engine conditions.