{"model":"mk2","model_name":"MK2 Supra","vehicle":"Toyota Supra A60 (1982–1986, 5M-GE)","document":"Repair Manual","section":"EC","section_name":"Emission Control Systems","page":11,"pages_in_section":16,"title":"Emission Control Systems","section_header":"Emission Control Systems — Exhaust Gas Recirculation (EGR) System","ocr_text":"EMISSION CONTROL SYSTEMS — Exhaust Gas Recirculation (EGR) System     EC-11\n\n(2)\n[Diagram showing EGR system with EGR Port, R Port, Temp. Sensor, VSV, EFI Computer, EGR Vacuum Modulator, EGR Valve, Pressure Chamber, EGR Cooler]\n\n(3)\n[Diagram showing similar EGR system with EGR Port, R Port, Temp. Sensor, VSV, EFI Computer, EGR Vacuum Modulator, EGR Valve, Pressure Chamber, EGR Cooler]\n\nE02912\nE02913\n\nTo reduce NOx emission, part of the exhaust gases are recirculated through the EGR valve to the intake manifold to lower the maximum combustion temperature.\n\nCoolant Temp. | VSV | Throttle Valve Opening Angle | Pressure in the EGR Valve Pressure Chamber | EGR Vacuum Modulator | EGR Valve | Exhaust Gas\n\nBelow 57°C (135°F) | OPEN | — | — | — | CLOSED | Not recirculated\n\n | | Positioned below EGR port | — | — | CLOSED | Not recirculated\n\nAbove 63°C (145°F) | CLOSE | Positioned be- tween EGR port and R port* | (1) LOW (2) HIGH (3) HIGH | *Pressure con- stantly alter- nating between low and high ** | OPENS passage to atmosphere CLOSES passage to atmosphere CLOSES passage to atmosphere | CLOSED OPEN OPEN | Not recirculated Recirculated Recirculated (increase)\n\n | | Positioned above R port | | | | \n\nRemarks: *Pressure increase → Modulator closes → EGR valve opens → Pressure drops\n           EGR valve closes → Modulator opens →\n\n**When the throttle valve is positioned above the R port, the EGR vacuum modulator will close the atmosphere passage and open the EGR valve to increase the EGR gas, even if the exhaust pressure is insufficiently low.","image":"https://tsrm.sasquatchvc.com/images/mk2/EC/EC_011.png","url":"https://tsrm.sasquatchvc.com/mk2/tsrm/EC/11","prev":{"page":10,"url":"https://tsrm.sasquatchvc.com/mk2/tsrm/EC/10","api":"https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/10"},"next":{"page":12,"url":"https://tsrm.sasquatchvc.com/mk2/tsrm/EC/12","api":"https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/12"},"section_url":"https://tsrm.sasquatchvc.com/mk2/tsrm/EC","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/1","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/2","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/3","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/4","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/5","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/6","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/7","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/8","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/9","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/10","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/11","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/12","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/13","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/14","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/15","https://tsrm.sasquatchvc.com/api/pages/mk2/tsrm/EC/16"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}