Camry 3.0L V6 & Camry Solara 3.0L V6
EGR system reduces oxides of nitrogen (NOx) emissions by lowering combustion temperatures. Combustion temperatures are lowered by recycling metered amount of exhaust gases back into intake system.
EGR system contains a vacuum-operated EGR valve, EGR position sensor, vacuum tank, EGR Vacuum Switching Valve (VSV) and EGR Vacuum Control Valve (VCV). See Fig 1. An EGR gas temperature sensor is screwed into lower side of EGR valve.
Amount of EGR operation is regulated by the vacuum which is regulated by EGR VSV which is controlled by Engine Control Module (ECM). EGR position sensor monitors movement of EGR valve and delivers an input signal to the ECM. The ECM uses this input signal to obtain the correct amount of EGR valve opening in relation to engine operation. ECM may shut off EGR system if any of the following conditions exist.
- Engine Is Not At Normal Operating Temperature
- During Deceleration With Throttle Closed
- During Light Engine Load
- Engine Is Idling
- Engine Speed Is Greater Than 4400 RPM