EXHAUST GAS RECIRCULATION
(EGR) SYSTEM
To reduce NOx emissions, part of the exhaust gasses are recirculated through the EGR valve to the intake manifold to
lower the maximum combustion temperature.
Coolant
Temp.
BVSV
Throttle Valve
Opening Angle
Pressure in the EGR
Valve pressure chamber
EGR Vacuum
Modulator
EGR
Valve
Exhaust
Gas
Below 40
_
C
(104
_
F)
CLOSED
–
–
–
CLOSED
Not
recirculated
Positioned below
port E
–
–
CLOSED
Not
recirculated
Above 54
_
C
OPEN
Positioned between
(1)
LOW
* Pressure
constantly alter-
OPENS passage
to atmosphere
CLOSED
Not
recirculated
(129
_
F)
OPEN
port E and port R
(2)
HIGH
y
nating between
low and high
CLOSES passage
to atmosphere
OPEN
Recirculated
Positioned above
port R
(3)
HIGH
–
CLOSES passage
to atmosphere
OPEN
Recirculated
(increase)
** When the throttle valve is positioned above port R, 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.
EC–8
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
Summary of Contents for 2VZ-FE
Page 1: ...ENGINE MECHANICAL EM 1 ENGINE MECHANICAL Description Operation ...
Page 31: ...CYLINDER HEADS COMPONENTS EM 29 ENGINE MECHANICAL Cylinder Heads ...
Page 63: ...CYLINDER BLOCK REMOVAL OF ENGINE EM 61 ENGINE MECHANICAL Cylinder Block ...
Page 64: ...EM 62 ENGINE MECHANICAL Cylinder Block ...
Page 71: ...COMPONENTS EM 69 ENGINE MECHANICAL Cylinder Block ...
Page 106: ...EFI SYSTEM FI 1 ...
Page 107: ...DESCRIPTION FI 2 EFI SYSTEM Description ...
Page 111: ...OPERATION System Circuit FI 4 EFI SYSTEM Operation System Circuit ...
Page 121: ...FUEL SYSTEM Fuel Pump EFI SYSTEM Fuel System Fuel Pump FI 15 ...
Page 141: ...Fuel Tank and Lines COMPONENTS EFI SYSTEM Fuel System Fuel Tank and Lines FI 35 ...
Page 172: ...EXHAUST SYSTEM EXHAUST SYSTEM REPAIR INSTRUCTIONS EX 1 ...
Page 174: ...EMISSION CONTROL SYSTEMS EC 1 ...
Page 186: ...COOLING SYSTEM CO 1 ...
Page 205: ...LUBRICATION SYSTEM LUBRICATION SYSTEM Description Operation LU 1 ...
Page 224: ...IGNITION SYSTEM IG 1 ...
Page 237: ...SERVICE SPECIFICATIONS IG 14 IGNITION SYSTEM ServiceSpecifications ...
Page 238: ...ENGINE TROUBLESHOOTING TR 1 ...