Camry 3.0L V6 & Camry Solara 3.0L V6

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Exhaust Gas Recirculation (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, EGR Vacuum Switching Valve (VSV) EGR Vacuum Control Valve (VCV) and EGR gas temperature sensor which is screwed into lower side of EGR valve. See Fig 1.

Amount of EGR operation 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 4000 RPM

The ECM uses various input signals for controlling EGR system operation. For EGR system and component testing, see EXHAUST GAS RECIRCULATION SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article.

Fig 1: Identifying EGR System Components (Camry 3.0L V6 & Camry Solara 3.0L V6)