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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.
Toyota Corolla Electrical System and Wire Harness Diagram (90)
The Corolla is a line of subcompact/compact cars produced by the Japanese automaker Toyota, which has become very popular throughout the world since the nameplate was first introduced in 1966.
The following Electrical System and Wire Harness Diagram apply for Toyota Corolla 1990 model year. Here you will find detail illustration of all electrical system and components of the vehicle including A/C and Heater System, Alternator, Back Door Courtesy Switch, Battery, Brake Fluid Level Switch, Center Differential Control Switch, Circuit Opening Relay, Clutch Start Switch Defogger, Distributor, ECU and Ignition Fuse, Engine Main Relay, Fuse Link Box, Ignition Switch, Igniter, Instrument Cluster, Integration Relay, Power Main Relay, Relay Block, Starter System, Shift Lock ECU, Theft Deterrent System, etc.
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