{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Electrical Wiring Diagram","section":"S3","section_name":"EFI System","page":10,"pages_in_section":12,"title":"EFI Main Relay and TCCS ECU Voltage Specifications","section_header":"EFI Main Relay / TCCS ECU Diagnostics","ocr_text":"EFI MAIN RELAY\nCLOSED WITH IGNITION S/W AT IG OR ST POSITION\n⑤ EFI RESISTOR\n1-2:2-3:2-4: EACH 2Ω\n⑥ INJECTOR\n1-2: EACH 1.5-3.0Ω\n⑦ STARTER RELAY\n2-4: CLOSED WITH CLUTCH PEDAL FULLY DEPRESSED\nAND IGNITION S/W AT ST POSITION\n⑧ CIRCUIT OPENING RELAY\n1-2: CLOSED WITH STARTER RUNNING OR\nMEASURING PLATE (AIR FLOW METER) OPEN\n⑨ FUEL PUMP RESISTOR\n1-2: APPROX. 0.7Ω\n⑩ AIR FLOW METER\n1-2: CLOSED WITH STARTER RUNNING OR\nMEASURING PLATE OPEN\n5-6: 20-400Ω\n5-4: 200-400Ω\n10-20KΩ (-20°C.-4°F)\n4-7KΩ (0°C.32°F)\n2-3KΩ (20°C.68°F)\n0.9-1.3KΩ (40°C.104°F)\n0.4-0.7KΩ (80°C.140°F)\n⑪ THROTTLE POSITION SENSOR\n2-4: 0.3-6.3KΩ WITH CLEARANCE BETWEEN\nLEVER AND STOP SCREN 0MM (MIN.)\n3-4: LESS THAN 2.3KΩ WITH CLEARANCE BETWEEN\nLEVER AND STOP SCREN 0.40MM (0.0157IN)\n∞Ω WITH 0.75MM (0.0295IN)\n2-4: 3.5-10.3KΩ WITH THROTTLE VALVE FULLY OPEN\n1-4: 4.25-8.25KΩ\n⑫ ISC VALVE\n2-1,3: EACH 10-30Ω\n1-2,4: EACH 10-30Ω\n⑬ WATER THERMO SENSOR\n1-2: APPROX.6KΩ (0°C.32°F)\nAPPROX.1.5KΩ (40°C.104°F)\nAPPROX.0.5KΩ (80°C.176°F)\nTCCS ECU (ELECTRONIC CONTROLLED UNIT)\nVOLTAGE AT ECU CONNECTORS\n⑦ 2-⑤ 7: 10-14 VOLTS\n⑧ 13.⑦ 14-⑤ 7: 10-14 VOLTS (IGNITION S/W ON)\n⑧ 1-⑤ 7: 10-14 VOLTS (IGNITION S/W ON)\n⑧ 9-⑤ 7: 10-14 VOLTS (IGNITION S/W ON)\n⑧ 13-⑦ 24: 4-8 VOLTS (IGNITION S/W ON.\nTHROTTLE VALVE OPEN)\n⑥ 14-⑦ 24: 0.1-5 VOLTS (IGNITION S/W ON.\nTHROTTLE VALVE CLOSED TO OPEN)\n⑧ 3-⑦ 24: 4-8 VOLTS (IGNITION S/W ON)\n⑧ 4-⑦ 24: 4-5 VOLTS (IGNITION S/W ON.\nMEASURING PLATE FULLY CLOSED)\n0.02-0.08 VOLTS (IGNITION S/W ON.\nMEASURING PLATE FULLY OPEN)\n2.0-4.0 VOLTS (IDLING)\n0.3-1.0 VOLTS (3000 RPM)\n⑦ 5-⑦ 24: 1.0-5.0 VOLTS (IGNITION S/W ON.\nINTAKE AIR TEMP.20°C (68°F)\n⑧ 1-⑦ 24: 0.1-1.0 VOLT (IGNITION S/W ON.\nCOOLANT TEMP.80°C(176°F)\n\n⑧ 3-⑤ 7 : 8-14 VOLTS\n(IGNITION S/W ST POSITION)\n⑤ 4.⑧ 6.⑤ 8-⑤ 7 : 9-14 VOLTS (IGNITION S/W ON)\n⑦ 3-⑤ 7 : 0.7-1.0 VOLTS (IDLING)\n⑧ 8.⑦ 5.⑧ 17.⑧ 18-⑤ 7: 9-14 VOLTS (IGNITION S/W ON)\n9-14 VOLTS\n(2-3 SECONDS AFTER ENGINE OFF)\n⑧ 1-⑦ 7 : 0 VOLT WITH IGNITION S/W ON.\nSHIFT POSITION P OR N RANGE\n10-14 VOLTS WITH IGNITION S/W ON.\nSHIFT POSITION EXCEPT P OR N RANGE\n0 VOLT WITH IGNITION S/W ON.\nCLUTCH PEDAL NOT DEPRESSED\n10-14 VOLTS WITH IGNITION S/W ON.\nCLUCH PEDAL DEPRESSED\n9-11 VOLTS WITH CRANKING\n⑧ 15-⑦ 7 : 4-8 VOLTS WITH IGNITION S/W ON.\nCHECK CONNECTOR T-E1 NOT SHORT\n0 VOLT WITH IGNITION S/W ON.\nCHECK CONNECTOR T-E1 SHORT\n⑧ 20-⑤ 7 : 10-14 VOLTS WITH IGNITION S/W ON\nA/C S/W ON\n0 VOLT WITH IGNITION S/W ON\nA/C S/W ON\n⑧ 16-⑤ 7 : 0<->5 VOLTS WITH ENGINE START\n(THROTTLE VALVE OPEN)\n⑧ 19-⑤ 7 : 0 VOLT WITH IGNITION S/W ON\n: 10-13 VOLTS WITH ENGINE START\n⑧ 18-⑤ 7 : 10-14 VOLTS WITH IGNITION S/W ON\nDEFOGGER S/W OFF\n0 VOLT WITH IGNITION S/W ON\nDEFOGGER S/W ON\n⑧ 16-⑤ 7 : 10-14 VOLTS WITH HEADLIGHT S/W OFF\n0 VOLT WITH HEADLIGHT S/W ON\nRESISTANCE AT ECU CONNECTOR\n(DISCONNECT WIRING CONNECTOR FROM ECU)\n⑧ 13-⑦ 24: ∞Ω (THROTTLE VALVE FULLY OPEN)\nLESS THAN 2.3KΩ (THROTTLE VALVE FULLY CLOSED)\n⑥ 14-⑦ 24: 3500-10300Ω (THROTTLE VALVE FULLY OPEN)\n300-8500Ω (THROTTLE VALVE FULLY CLOSED)\n⑧ 3-⑦ 24: 200-400Ω\n⑧ 4-⑦ 24: 20-800Ω (MEASURING PLATE FULLY CLOSED)\n20-3000Ω (MEASURING PLATE FULLY OPEN)\n⑦ 5-⑦ 24: 2000-3000Ω (INTAKE AIR TEMP.20°C.68°F)\n⑦ 5.⑦ 6.⑧ 4-⑧ 7: 140-180Ω\n⑧ 8.⑦ 9.⑧ 17.⑧ 18-⑦ 14: 10-30Ω","image":"https://tsrm.sasquatchvc.com/images/mk3-ewd/S3/S3_010.png","url":"https://tsrm.sasquatchvc.com/mk3/ewd/S3/10","prev":{"page":9,"url":"https://tsrm.sasquatchvc.com/mk3/ewd/S3/9","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/9"},"next":{"page":11,"url":"https://tsrm.sasquatchvc.com/mk3/ewd/S3/11","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/11"},"section_url":"https://tsrm.sasquatchvc.com/mk3/ewd/S3","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/1","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/2","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/3","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/4","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/5","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/6","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/7","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/8","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/9","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/10","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/11","https://tsrm.sasquatchvc.com/api/pages/mk3/ewd/S3/12"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}