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1990 Toyota Supra MA70 Fuel System Circuit Diagram
The following circuit diagram shows 1990 Toyota Supra MA70 Fuel System Circuit Diagram. The Fuel system is composed of 3 basic sub systems: Fuel, Air Induction and Electronic Control Systems. The Electronic Control System controls the following functions: Electronic Fuel Injection (EFI); Electronic Spark Advance (ESA); Idle Speed Control (ISC); Diagnosis (detects any malfunctions or abnormalities in the sensor network and lights the "CHECK ENGINE" warning light on the instrument panel); and Fail-safe Function. (click image to enlarge).
The ECU receives signals from various sensors indicating changing engine operating conditions such as: Exhaust oxygen content, Intake air volume, Intake air temperature, Coolant temperature, Engine rpm, Acceleration / deceleration etc. These signals are utilized by the ECU to determine the injection duration necessary for an optimum air-fuel ratio.
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