Page 1129 of 2543

EXHAUST GAS RECIRCULATION (EGR)
SYSTEM
EGR SYSTEM INSPECTION
1. INSPECT AND CLEAN FILTER IN EGR VACUUM
MODULATOR
(a) Remove the cap and 2 filters.
(b) Check the filter for contamination or damage.
(c) Using compressed air, clean the filter.
(d) Reinstall the 2 filters and cap.
HINT: Install the filter with the coarser surface facing the at-
mospheric side (outward).
2. INSTALL VACUUM GAUGE
Using a 3±way connector, connect a vacuum gauge to the
hose between the EGR valve and vacuum modulator.
3. INSPECT SEATING OF EGR VALVE
Start the engine and check that the engine starts and runs at
at idle.
4. INSPECT VSV OPERATION WITH COLD ENGINE
(a) The coolant temperature should be below 50°C (122° F).
(b) From idle, race the engine to 3,500±4,000 rpm (throttle valve
opening angle to about 1/3 of maximum).
(c) Check that the EGR pipe is not hot.
(d) Check that the vacuum gauge indicates zero.
5. INSPECT VSV OPERATION WITH HOT ENGINE
(a) Warm up the engine to above 50°C (122°F)
(b) From idle, race the engine to 3,500±4,000 rpm (throttle valve
opening angle to about 1/3 of maximum).
(c) Check that the vacuum gauge indicates low vacuum.
6. REMOVE VACUUM GAUGE
Remove the vacuum gauge, and reconnect the vacuum
hoses to their proper locations.
7. INSPECT 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 locations.
IF NO PROBLEM IS FOUND DURING THIS INSPECTION,
SYSTEM IS NORMAL; OTHERWISE INSPECT EACH
PART
VSV INSPECTION
(See VSV for EGR in SFI System) EG±180
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)
Page 1130 of 2543
EGR VACUUM MODULATOR
INSPECTION
1. DISCONNECT VACUUM HOSES FROM EGR VACUUM
MODULATOR
Disconnect the 2 vacuum hoses from ports P and Q of the
EGR vacuum modulator.
2. INSPECT EGR VACUUM MODULATOR OPERATION
(a) Block port P with your finger.
(b) Blow air into port Q, and check that the air passes through to
the air filter side freely.
(c) Start the engine, and maintain speed at 3,500 rpm.
(d) Repeat the above test. Check that there is a strong
resistance to air flow.
3. RECONNECT VACUUM HOSES TO EGR VACUUM
MODULATOR
Reconnect the 2 vacuum hoses to the proper locations.
EGR VALVE INSPECTION
1. REMOVE EGR PIPE
(a) Loosen the union nut of the EGR pipe.
(b) Remove the 2 bolts, EGR pipe and gasket.
2. REMOVE EGR GAS TEMPERATURE SENSOR
3. REMOVE EGR VALVE
(a) Disconnect these hoses from the EGR valve:
(1) Vacuum hose
(2) Pressure hose
(b) Remove the 2 nuts, EGR valve and gasket.
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±181
Page 1131 of 2543
4. INSPECT EGR VALVE
Check for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve.
5. REINSTALL EGR VALVE
(a) Place a new gasket on the air intake chamber.
(b) Install the EGR valve with the 2 nuts.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(c) Reconnect the following hoses to the EGR valve:
wVacuum hose
wPressure hose
6. REINSTALL EGR GAS TEMPERATURE SENSOR
Torque: 20 NVm (200 kgfVcm, 14 ftVlbf)
7. REINSTALL EGR PIPE
(a) Temporarily install the union nut of the EGR pipe.
(b) Install a new gasket and the EGR pipe with the 2 bolts.
Torque: 27 NVm (280 kgfVcm, 20 ftVlbf)
(c) Tighten the union nut of the EGR pipe.
Torque: 64 NVm (650 kgfVcm, 47 ftVlbf)
EG±182± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)
Page 1132 of 2543
THREE±WAY CATALYTIC CONVERTER
(TWC) SYSTEM
EXHAUST PIPE ASSEMBLY INSPECTION
1. CHECK CONNECTIONS FOR LOOSENSESS OR
DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR
DAMAGE
TWC INSPECTION
CHECK FOR DENTS OR DAMAGE
If any part of the protector is damaged or dented to the extent
that it contacts the TWC, repair or replace it.
HEAT INSULATOR INSPECTION
1. CHECK HEAT INSULATOR FOR DAMAGE
2. CHECK FOR ADEQUATE CLEARANCE BETWEEN
CATALYTIC CONVERTER AND HEAT INSULATOR
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±183
Page 1133 of 2543
COMPONENTS FOR FRONT TWC
REPLACEMENT
EG±184± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)
Page 1134 of 2543
COMPONENTS FOR REAR TWC
REPLACEMENT
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±185
Page 1135 of 2543
SERVICE SPECIFICATIONS
TORQUE SPECIFICATIONS
Part tightened NVm kgfVcm ftVlbf
EGR valve x Air Intake chamber 21 210 15
EGR gas temperature sensor x EGR valve 20 200 14
EGR pipe x Cylinder head
27
280
20
EGR valve x EGR pipe 64 650 47
No.2 front exhaust pipe (Front TWC) x Exhaust manifold 62 630 46
Pipe support bracket x Transmission 43 440 32
No.2 front exhaust pipe (Front TWC) x Front exhaust pipe (Rear TWC)
43
440
32
Front exhaust pipe (Rear TWC) x Center exhaust pipe 43 440 32
Sub heated oxygen sensor x Front exhaust pipe 20 200 14
EG±186± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)
Page 1136 of 2543