{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"TGTE","section_name":"Troubleshooting 2JZ-GTE","page":90,"pages_in_section":113,"title":"ECM Power Source Circuit","section_header":"Engine — 2JZ–GTE Engine Troubleshooting","ocr_text":"EG–576\n\nENGINE – 2JZ–GTE ENGINE TROUBLESHOOTING\n\nECM Power Source Circuit\n\nCIRCUIT DESCRIPTION\n\nWhen the ignition switch is turned on, battery volt-age is applied to the terminal IGSW of the ECM, and the main relay control circuit in the ECM sends a signal to the terminal M–REL of the ECM, switch-ing on the main relay. This signal causes current to flow to the coil, closing the contacts of the main relay and supplying power to the terminal + B of the ECM.\nIf the ignition switch is turned off, the ECM contin-ues to switch on the main relay for a maximum of 2 seconds for the initial setting of the IAC valve.\n\nEngine Control Module\nEFI\nNo.1\nFuse\nEFI\nMain\nRelay\n+B\nM-REL\nIGSW\nAM2\nFuse\nIgnition\nSwitch\nMain Relay\nControl\nCircuit\nBattery\nE1\n\nP18745\n\nWIRING DIAGRAM\n\nEngine Control Module\n\nW-R  2    3  B-O\nIgnition\nSwitch\n1J    1E  IGN\nJ/B No.1\nB-O\nII1\nB-O  1  IGSW\nE18\nE1\n\nB-R  31  +B\nE10\n\nIB1\nB-Y\n2      2\n3\n5\nB-R\nEA2\nB+\n\nW-R\n2      2\n1\nGR\nEA1\nGR  24\nE10\nM-REL\n\nEF1 Main Relay\nR/B No.2\n\n2    2\nAM2\nEF1 No.1\n\n2A\nB\nBattery\n\nW-B\n\nBR  69\nE9  E1\n\nP18746","image":"https://tsrm.sasquatchvc.com/images/mk4/TGTE/TGTE_090.png","url":"https://tsrm.sasquatchvc.com/mk4/tsrm/TGTE/90","prev":{"page":89,"url":"https://tsrm.sasquatchvc.com/mk4/tsrm/TGTE/89","api":"https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/89"},"next":{"page":91,"url":"https://tsrm.sasquatchvc.com/mk4/tsrm/TGTE/91","api":"https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/91"},"section_url":"https://tsrm.sasquatchvc.com/mk4/tsrm/TGTE","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/1","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/2","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/3","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/4","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/5","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/6","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/7","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/8","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/9","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/10","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/11","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/12","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/13","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/14","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/15","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/16","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/17","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/18","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/19","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/20","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/21","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/22","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/23","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/24","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/25","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/26","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/27","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/28","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/29","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/30","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/31","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/32","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/33","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/34","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/35","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/36","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/37","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/38","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/39","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/40","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/41","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/42","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/43","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/44","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/45","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/46","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/47","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/48","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/49","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/50","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/51","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/52","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/53","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/54","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/55","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/56","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/57","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/58","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/59","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/60","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/61","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/62","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/63","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/64","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/65","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/66","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/67","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/68","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/69","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/70","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/71","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/72","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/73","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/74","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/75","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/76","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE/77","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/TGTE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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}