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Toyota SUPRA Sports Car Service Manual
From 1986-1998
Toyota SUPRA Turbo Non Turbo MKIII MKIV Service Manual

Toyota Celica-Supra 1986-1990 Repair Manual provides service, repair and maintenance information for 1986-90 Toyota Celica and Supra vehicles.

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The fuse box is located under the dashboard to the left of the steering column. The underhood fuse panel (if equipped) is located beside the battery. The circuits protected by each fuse are listed on the plastic sheet inside the cover. FUSE PANEL IDENTIFICATION (1986-89) 1 – 15 Amp Charge Warning Light, Voltage Regulator, Cooling Fan Timer Control Unit, Fuel Cut-off Relay, Speed Sensor, PGM-FI Main Relay, Fuel Pump, Control Solenoid Valves, Emission Control Unit, Speed Sensor (Automatic Seat Belts, 1988-89) ? 2 – 10 Amp Safety Indicator, Shift Lever Position Indicator, Clock & Gauges, Tachometer, Back-Up Lights, Turn Signal Relay & Lights, Integrated Control Unit, Warning Lights, Cruise Control Indicator, Light Dimming Circuit, Automatic Seat Belt Control Unit, Shift Lock Solenoid (1989) 3 – 20 Amp Wiper Motors, Washer Motors, Intermittent Wiper Relay, Sun Roof Relays,Power Window Relay 4 – 7.5 Amp Cruise Control Unit, Cruise Control Indicator Light 5 – 10 Amp Rear Window Defogger Relay, Rear Window Defogger Indicator Light, Heater Control Amplifier, Fan Motor, A/C Compressor Clutch & Relay, A/C Delay Unit, Heater Control Panel 6 – 10 Amp Right Headlight Low Beam 7 – 10 Amp Left Headlight Low Beam 8 – 15 Amp Left Headlight High Beam 9 – 15 Amp Right Headlight High Beam, High Beam Indicator Light 10 – 7.5 Amp Brake Warning Bulb Check Circuit, PGM-FI ECU, PGM-FI Main Relay, Emission Control Unit 11 – 15 Amp Headlight Retractor Control Unit (Up) 12 – 15 Amp Power Door Mirrors, EFE Heater Unit, Radiator Fan Relay, Cooling Fan Timer Unit 13 – 10 Amp Power Antenna Motor, Stereo Radio/Cassette Player, Power Amplifier (SEi Model) 14 – 15 Amp Vanity Mirror Light, License Plate Lights, Taillights, Rear Side Marker Lights, Dash Light Brightness Control Unit, Cigarette Lighter Illumination, Ashtray Light, Headlight Retractor Control Unit (Light-On), Dash & Switch Lights 15 – UNDERHOOD FUSE PANEL IDENTIFICATION (1986-89)

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1988 FUEL INJECTION Bosch AFC Toyota; Camry, Celica, Corolla, Cressida, Land Cruiser, MR2, Pickup, Supra, Van, 4Runner DESCRIPTION For specifications on Throttle Position Sensor (TPS), idle speed and mixture, and fuel pump output volume, see appropriate article in TUNE-UP PROCEDURES section. The Bosch AFC (L-Jetronic) fuel injection system is used on all models. However, variations may exist between model applications. This article covers the Bosch AFC system in general, with manufacturers’ differences noted under SPECIAL FEATURES. For computer control information, see the appropriate article in 1988 COMPUTERIZED ENGINE CONTROLS section. The Bosch Airflow Controlled (AFC) fuel injection system is an electronically controlled system operated by incoming airflow. Some vehicles are equipped with a potentiometer to measure incoming air flow, while other vehicles use a hot wire type airflow sensor.

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IGNITION TIMING: Tachometer Hookup Start engine and allow to reach normal operating temperature.
1.Connect a tachometer test probe to terminal IG of the check connector, Fig. 211 2.NOTE: Never let the tachometer lead touch ground as this could cause damage to the igniter and/or coil. Be sure to check that your tachometer is compatible with this ignition system. Consult the operating manual for your instrument. Service Check Connector