{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Repair Manual","section":"EC","section_name":"Emission Control Systems","page":12,"pages_in_section":22,"title":"Exhaust Gas Recirculation (EGR) System (7M-GE)","section_header":"Emission Control Systems — Exhaust Gas Recirculation (EGR) System (7M-GE)","ocr_text":"EC-12     EMISSION CONTROL SYSTEMS — Exhaust Gas Recirculation (EGR) System (7M-GE)\n\nEXHAUST GAS RECIRCULATION (EGR) SYSTEM (7M-GE)\n\n(1)\nEGR Port    R Port    EGR Vacuum Modulator\n                      EGR Valve\n\nVSV\n\nEC3033\n\n(2)\nEGR Port\nR Port\n\nECU\nVSV\nEGR Cooler\nEGR Vacuum Modulator\nEGR Valve\n\nEC3034\n\n(3)\nEGR Port\nR Port\n\nECU\nVSV\nEGR Cooler\nEGR Vacuum Modulator\nEGR Valve\n\nEC3035\n\nTo reduce NOx emissions, part of the exhaust gases are recirculated through the EGR valve to the intake manifold to lower the maximum combustion temperature.\n\nCoolant Temp. | *Engine RPM | 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\nAbove 57°C (135°F) | Above 4,000 rpm | OPEN | - | - | - | CLOSED | Not recirculated\n\n | Below 4,000 rpm | CLOSED | Positioned below EGR port | (1) LOW | ** Pressure constantly alternating between low and high | OPENS passage to atmosphere CLOSES passage to atmosphere | CLOSED | Not recirculated\n\nAbove 65°C (149°F) | | | Positioned between EGR port and R port | (2) HIGH | | | OPEN | Recirculated\n\n | | | Positioned above R port | (3) HIGH | *** | | OPEN | Recirculated (Increased)\n\n* Engine RPM control is for Calif. only.\n** Pressure increase ——— Modulator closes ——— EGR valve opens ——— Pressure drops\n    EGR valve close ——— Modulator opens ———\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/mk3/EC/EC_012.png","url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC/12","prev":{"page":11,"url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC/11","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/11"},"next":{"page":13,"url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC/13","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/13"},"section_url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/1","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/2","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/3","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/4","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/5","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/6","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/7","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/8","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/9","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/10","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/11","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/12","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/13","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/14","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/15","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/16","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/17","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/18","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/19","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/20","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/21","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/22"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}