Exhaust Gas Recirculation Egr System

EGR Vacuum Modulator

EGR Valve

EGR Gas Temp. Sensor (Calif, only)

EGR Vacuum Modulator

EGR Valve

EGR Gas Temp. Sensor (Calif, only)

Aw11 Mr2 Egr Diagram

(Black)

Check Valve

BVSV

(Black)

Check Valve

BVSV

E Port

R Port

E Port

R Port i

EGR Valve

BVSV

EGR Vacuum Modulator

EGR Vacuum Modulator

BVSV

EGR Valve i

Pressure Chamber From Exhaust Manifold

E Port,

To Vacuum Tank VSV

To Vacuum Tank VSV

(Black) œssr (Orange) Check Valve

(Black) œssr (Orange) Check Valve

BVSV

R Port

R Port

Valve Bvsv

EGR Valve

Pressure Chamber From Exhaust Manifold

EGR Vacuum Modulator

EGR Vacuum Modulator

BVSV

EGR Valve

To Vacuum Tank VSV

Pressure Chamber From Exhaust Manifold

Distributor rum

Distributor ruin

EC2347 EC2348

E Port

BVSV

R Port

E Port

R Port

Aw11 Egr Valve

EGR Valve

Pressure

Chamber From Exhaust Manifold

EGR Vacuum Modulator

EGR Vacuum Modulator

BVSV

Distributor

EGR Valve

To Vacuum Tank VSV

To Vacuum Tank VSV

Distributor

inr

Chamber From Exhaust Manifold

E Port

BVSV

R Port

E Port

R Port

Valve Bvsv

EGR Valve

Pressure Chamber From Exhaust Manifold

BVSV

EGR Vacuum Modulator

Valve Bvsv

To Vacuum Tank

EGR Vacuum Modulator

Distributor rinn

EGR Valve

To Vacuum Tank

(Black) bê=M (Orange) Check Valve

Pressure Chamber From Exhaust Manifold

EC2349 EC2350

To reduce NOx emissions, part of the exhaust gases are recirculated through the EGR valve to the intake manifold to lower the maximum combustion temperature.

Coolant Temp.

BVSV

ENGINE rpm

VSV

Throttle Valve Opening Angle

Pressure in the EGR Valve Pressure Chamber

EGR Vacuum Modulator

EGR Valve

Exhaust Gas

Below 35°C (95°F)

CLOSED

-

-

-

-

CLOSED

Not recirculated

Above 54°C (129°F)

OPEN

Below 4,350 rpm

ON

Positioned below E port

-

-

CLOSED

Not recirculated

Positioned between E port and R port

(1) LOW

•Pressure constantly alternating between low and high

OPENS passage to atmosphere

CLOSED

Not recirculated

(2) HIGH

CLOSES passage to atmosphere

OPEN

Recirculated

Positioned above R port

(3) HIGH

••

CLOSES passage to atmosphere

OPEN

Recirculated (increase)

Above 4,350 rpm

(4) OFF

-

-

-

CLOSED

Not recirculated

# Pressure increase—•►Modulator closes——EGR valve opens——Pressure drops

## 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.

Christmas Card Clip Art Black And White
DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

Get My Free Ebook


Responses

  • giuseppa
    How to remove egr valve from 1989 toyota mr2?
    2 years ago

Post a comment