Exhaust Gas Recirculation Egr System

EGR Port

Vacuum

Modulator

Temp. Sensor

2004 Camry Egr Valve Located

EGR Valve

EGR Port

Vacuum

Modulator

EGR Valve

Temp. Sensor icwo

EGR Port

R Port

Prius Egr Toyota

Vacuum

Modulator

EGR Valve

Pressure Chamber

Cooler

Cooler

EGR Port

R Port

Vacuum

Modulator

EGR Valve

Pressure Chamber ccotn

EGR Port

Port

EGR Port

Port

Egr System

Vacuum

Modutator

EGR Valve

Pressure Chamber

EGR Port

R Port

Vacuum

Modutator

EGR Valve

Pressure Chamber

EGR Port

R Port

Supra Car Vacuum System Pictures

Vacuum

Modulator

EGR Valve

Pressure Chamber

Vacuum

Modulator

EGR Valve

Pressure Chamber icotn

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

Coolant Temp.

VSV

Throttle Valve Opening Angle

Pressure In the EGR Valve Pressure Chamber

EGR Vacuum Modulator

EGR Valve

Exhaust Gas

Below 570c

(135°F) 0PEN

CLOSED

Not recirculated

Above 63°C C145°F|

CLOSE

Positioned below EGR port

CLOSED

Not recirculated

Positioned be tween EGR port and R port

<11 LOW

•Pressure con-stantly 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)

Remarks: • 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.

Remarks: • 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.

Egr Vacuum Modulator Cleaning

INSPECTION OF EGR VALVE

1. CHECK AND CLEAN FILTER IN EOR VACUUM MODULATOR

(a) Check the filter for contamination or damage. <b) Using compressed air, clean the filter.

Vacuum Gauge

Vacuum Gauge

1983 Toyota Supra Vacuum Egr Modulator

ICC9J4

2. PREPARATION

Disconnect the vacuum hose from the EGR valve and, using a three way union, connect a vacuum gauge to it.

COLD

COLD

1983 Toyota Supra Vacuum Egr Modulator
fCOD? f CCI W

3. CHECK SEATING OF EGR VALVE

Start the engine and check that the engine starts and runs at idle.

4. CHECK VSV WITH COLD ENGINE

(a) The coolant temperature should be below 57°C (135°F).

(b) Check that the vacuum gauge indicates zero at 2,500 rpm.

5. CHECK VSV AND EGR VACUUM MODULATOR WITH WARM ENGINE

(b) Check that the vacuum gauge indicates about 70 mm Hg (2.76 in.Hg, 9.3 kPa) at 2r500 rpm.

(c) Check that the vacuum gauge indicates zero at idle.

Tachomcter Vacuum G¿uge

Vacuum Gauge Toyota Tacoma

(d) Disconnect the vacuum hose from R port of the EGR vacuum modulator and connect R port directly to the intake manifold with another hose.

(e) Check that the vacuum gauge indicates high vacuum at 2,500 rpm.

NOTE: As a large amount of EGR gas enters, the engine will misfire.

(f) Disconnect the vacuum gauge and reconnect the vacuum hoses to the proper locations.

2,500 rpm Low Vacuum

1983 Toyota Supra Vacuum Egr Modulator

2,500 rpm Low Vacuum

Tachomcter Vacuum G¿uge

6. CHECK EGR VALVE

(a) Apply vacuum directly to the EGR valve with the engine idling.

(b) Check that the engine runs rough or dies.

(c) Reconnect the vacuum hoses to the proper location.

IF NO PROBLEM IS FOUND WITH THIS INSPECTION, THE SYSTEM IS OKAY; OTHERWISE INSPECT EACH PART

Test Egr Vacuum Modulator

INSPECTION OF EGR VACUUM MODULATOR

CHECK EGR VACUUM MODULATOR OPERATION

(a) Disconnect the vacuum hoses from ports P, Q and R of the EGR vacuum modulator.

(b) Block ports P and R with your finger.

(c) Blow air into port Q. Check that the air passes through to the air filter side freely.

Rav4 Port Egr Modulator

(d) Start the engine and maintain engine speed at 2,500 rpm.

(e) Repeat the above test. Check that there is a strong resistance to air flow.

(f) Disconnect the vacuum hoses to the proper locations. If a problem is found, replace the EGR vacuum modulator.

Gas Vacuum Hoses For Toyota

INSPECTION OF VSV

1. CHECK VACUUM CIRCUIT CONTINUITY IN THE VSV BY BLOWING AIR INTO PIPE

(a) Connect the VSV terminals to the battery terminals as illustrated.

(b) Blow air into a pipe and check that the VSV is open.

Exhaust Gas Recirculation Circuit

(c) Disconnect the battery.

(d) Blow air into a pipe and check that the VSV is closed. If a problem is found, replace the VSV.

Toyota Camry Vsv

2. CHECK FOR SHORT CIRCUIT

Using an ohmmeter, check that there is no continuity between the terminals and the VSV body.

If there is continuity, replace the VSV.

3. CHECK FOR OPEN CIRCUIT

Using an ohmmeter, measure the resistance between the terminals.

If the resistance is not within specification, replace the VSV.

INSPECTION OF EGR VALVE

1. REMOVE EGR VALVE

Check the valve for sticking and heavy carbon deposits. If a problem is found, replace it.

2. INSTALL EGR VALVE WITH NEW GASKET

INSPECTION OF WATER TEMP. SENSOR (See page FI-73)

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Responses

  • harland kowalczyk
    How to clean 2000 camry EGR modulator filter?
    6 years ago
  • almaz
    Where to connect the vacuum gauge to idle mixture?
    6 years ago
  • armas
    How to clean a modulator egr filter toyota camry le 2000?
    6 years ago
  • briffo
    Where is the coolant temperature sensor on a 1997 toyota celica gt?
    6 years ago
  • Aleksi
    Where is the heat sensor on toyota celica?
    5 years ago
  • gerda
    How to install closed circuit for Toyota Land Cruiser 2002?
    5 years ago
  • Semira
    Where is temperature sensor on toyota camry 2001?
    5 years ago
  • natascia
    How to hook an egr valve to the exhaust in an 2001 toyota camry?
    5 years ago
  • Menegilda
    Where is the low side pressure service port in toyota rav4?
    5 years ago
  • laura
    How to clean carbon in the air system flow in toyota avalon 1996?
    5 years ago
  • felix
    Where is EGR located on 1998 Toyota Camry?
    5 years ago

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