{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Electrical Wiring Diagram","section":"INTRO","section_name":"Introduction & How To Use","page":5,"pages_in_section":6,"title":"How to Use This Manual","section_header":"How to Use This Manual","ocr_text":"B HOW TO USE THIS MANUAL\n\n1-1 POWER SOURCE (Power-Load Reference)\n\nJ/B No.2 (Engine Compartment)\n30A RTR Remain Illumination Relay No. 2)\nP5A CHARGE Alternator\n15A HEAD LH Headlight LH\n15A HEAD RH Headlight RH\n Turn Signal Flasher\n Horn, Horn Relay\n15A HAZ-HORN Hazard Switch\nFuel Pump\n15A EFI Circuit Opening Relay, TCCS ECU, Crank Generator, ISC Valve, VSV, BVSV, Fuel Pressure-up VSV, Intake Air Control Valve Air Damper, O2 Sensor Main, DX Sensor\nClock\n10A RAD O/PRD J Super Monitor Computer\nAuto Antenna Computer\nAuto Antenna\nRadio and Turn Signal\n\n1-2 POWER SOURCE\n\n[Circuit diagram showing power distribution from battery through fuses]\n\nJ/B No. 2\n\nRELAY LOCATIONS\n[Diagram showing relay box layout with labels:\nCHG RL\nFUEL PMP RL\nAWC RL\nHEAD LIGHT RELAY\nFAN RELAY MAIN\nFAN RELAY SUB\nFOG TAIL LIGHT CIRCUIT\nINJ\nNO. 1 FAN\nIG COIL CIRCUIT OPENING\nHAZ-HORN FLASHER\nNO. 1 FAN\nEFI]\n\n2. Inspection of Common Circuits\n(a) Check battery and fusible link\n(b) Check related systems\nCheck how the HEAD FUSE is related to the system.\nIn system No. 1-1 (POWER SOURCE), you will find\na chart listing the relationship between the fuses and\ncomponents. Here we can see that the HEAD fuses are\nrelated only to their respective headlights.\n\n(c) Check the circuit from the battery to the HEAD FUSE.\n① In system No. 1-2 (POWER SOURCE), tha power\ncircuits for all fuses are listed. The circuit between\nthe battery and HEAD fuse branches off with fuses\nHAZ-HORN 15A etc.\n② Turn on the HAZARD switch\n\nOkay .... No trouble in circuit up to HAZ-HORN\njunction.\nBad ...... Trouble lies between fusible link and J/B\nNo. 2.\n\n(d) Check the HEADLIGHT RELAY\n(Return to HEADLIGHT page)\n1 The circuit shows that the HEADLIGHT RELAY is\nin J/B No. 2.\n2 Installation of the relay can be found by referring\nto the RELAY LOCATIONS. The HEADLIGHT\nRELAY is located in J/B No. 2 in the engine compartment as shown.\n3 Check for power to the headlight relay coil.\n① Turn the headlight switch to HEAD.\n② Using a voltmeter, check for voltage as shown\nbelow.\n\nNegative (-) Probe .... Pin No. 6 of 2B.\nPositive (+) Probe ..... Pin No. 2 of 2A.\n\nConfirm that there is voltage","image":"https://tsrm.sasquatchvc.com/images/mk3-ewd/INTRO/INTRO_005.png","url":"https://tsrm.sasquatchvc.com/mk3/ewd/INTRO/5","prev":{"page":4,"url":"https://tsrm.sasquatchvc.com/mk3/ewd/INTRO/4","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/4"},"next":{"page":6,"url":"https://tsrm.sasquatchvc.com/mk3/ewd/INTRO/6","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/6"},"section_url":"https://tsrm.sasquatchvc.com/mk3/ewd/INTRO","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/1","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/2","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/3","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/4","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/5","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/INTRO/6"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}