Exhaust Gas Recirculation Control

Camry 2.2L 4-Cyl. CNG & Gasoline Models, & Camry Solara 2.2L 4-Cyl.

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 vacuum modulator and EGR Vacuum Switching Valve (VSV). See Fig. 61 . Amount of EGR operation is regulated by EGR vacuum modulator according to engine load. EGR valve operation is controlled by EGR VSV, which is controlled by Engine Control Module (ECM). If ECM turns on EGR VSV, EGR valve closes and shuts off the exhaust gas flow. ECM may shut off EGR system if any of the following conditions exist:

Engine Is Not At Normal Operating Temperature

2001 ENGINE PERFORMANCE Theory & Operation

• During Deceleration With Throttle Closed

• During Light Or Heavy Engine Load

• Engine Is Idling

• Engine Speed Is Greater Than 4400 RPM

The ECM uses various input signals for controlling EGR system operation. For EGR system and component testing, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article.

Delete Egr 4age

Fig. 61: Identifying Typical EGR System Components (Camry 2.2L 4-Cyl. CNG & Gasoline Models, & Camry Solara 2.2L 4-Cyl.)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. Camry 3.0L V6 & Camry Solara 3.0L V6

Fig. 61: Identifying Typical EGR System Components (Camry 2.2L 4-Cyl. CNG & Gasoline Models, & Camry Solara 2.2L 4-Cyl.)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. Camry 3.0L V6 & Camry Solara 3.0L V6

Exhaust Gas Recirculation (EGR) system reduces oxides of nitrogen (NOx) emissions by lowering combustion

2001 ENGINE PERFORMANCE Theory & Operation 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. 62 . An EGR gas temperature sensor is screwed into lower side of EGR valve.

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 SYSTEM & COMPONENT TESTING - V6 & V8 article.

2001 ENGINE PERFORMANCE Theory & Operation

Egr 2001 Sienna
Fig. 62: Identifying EGR System Components (Camry 3.0L V6 & Camry Solara 3.0L V6) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tacoma 2.7L 4-Cyl. 3RZ-FE

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 vacuum modulator and EGR Vacuum Switching Valve (VSV). See Fig. 63 . Amount of EGR operation is regulated by EGR vacuum modulator according to engine load. EGR valve operation is controlled by EGR VSV which is controlled by Engine Control Module (ECM). If ECM turns on EGR VSV, this causes EGR valve to close and shut off the exhaust gas. 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

2001 ENGINE PERFORMANCE Theory & Operation

• During Light Engine Load

• Engine Is At High Speed

The ECM uses various input signals for controlling EGR system operation. For EGR system and component testing, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article.

Test Egr System Toyota
Fig. 63: Identifying EGR System Components (Tacoma 2.7L 4-Cyl. 3RZ-FE) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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