{"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":16,"pages_in_section":22,"title":"Exhaust Gas Recirculation (EGR) System (7M-GTE)","section_header":"Emission Control Systems — Exhaust Gas Recirculation (EGR) System (7M-GTE)","ocr_text":"EC-16     EMISSION CONTROL SYSTEMS — Exhaust Gas Recirculation (EGR) System (7M-GTE)\n\nEXHAUST GAS RECIRCULATION (EGR) SYSTEM (7M-GTE)\n\n(1)\nEGR Vacuum\nModulator\n                                                                                      EGR Port\nEGR Valve\n                                                                                      VSV\n                                                                                      E···E\n                                                                     ECU\n                                                                                      EGR\nVSV                                                                                   Vacuum\n                                                                                      Modulator\n                                                      EGR Cooler                      EGR\n                                                                                      Valve\n\nEC3330                                                                                EG2283\n\n(2)\n                            EGR Port\n\n                            VSV\n                            E···E\n              ECU\n\n              EGR\n              Vacuum\n              Modulator\nEGR Cooler                                EGR\n                                          Valve\n\n                                                                                      EG2380\n\nTo reduce NOx emissions, part of the exhaust gases are recirculated through the EGR valve to the intake manifold to lower\nthe maximum combustion temperature.\n\nCoolant          VSV          Throttle Valve      Pressure in the EGR     EGR Vacuum        EGR           Exhaust Gas\nTemp.                         Opening Angle       Valve Pressure Chamber  Modulator         Valve\n\nBelow 57°C       CLOSED\n(135°F)          (E—G)                            —                       —                 CLOSED        Not\n                                                                                                           recirculated\n\nAbove 63°C       OPEN         Positioned below\n(145°F)          (E—G)        EGR port            (1)                     —                 CLOSED        Not\n                                                                                                           recirculated\n                              Positioned above\n                              EGR port            (2)                     *                 CLOSES passage OPEN         Recirculated\n                                                                                            to atmosphere               (Increase)\n\n* When the throttle valve is positioned above the EGR port, the EGR vacuum modulator will close the atmosphere\n  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_016.png","url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC/16","prev":{"page":15,"url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC/15","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/15"},"next":{"page":17,"url":"https://tsrm.sasquatchvc.com/mk3/tsrm/EC/17","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/EC/17"},"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."}