Page 1273 of 1807
B02438
EC046-01
EC3069Check Valve (Vacuum Valve)Gasket
P12150
P12175
Z16768
Port C
Compressed
Air
Air AirAir
- EMISSION CONTROL (2JZ-GTE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC-5
1242 Author: Date:
1997 SUPRA (RM502U)
EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM
INSPECTION
1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loose connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK
Look for deformation, cracks or fuel leakage.
3. VISUALLY INSPECT FUEL TANK CAP
Check if the cap and/or gasket are deformed or damaged.
If necessary, repair or replace the cap.
4. REMOVE CHARCOAL CANISTER
5. VISUALLY INSPECT CHARCOAL CANISTER
Look for cracks or damage.
6. CHECK FOR CLOGGED FILTER AND STUCK CHECK
VA LV E
(a) Using low pressure compressed air (4.71 kPa (48 gf/cm
2,
0.68 psi)), blow into port C and check that air flows without
resistance from the other ports.
Page 1274 of 1807

Z16769
Port A
Compressed
Air
Z16770
Port B
Compressed
Air
Z16771
Port A
Compressed
Air Port C Port B
P12318
Check Valve
Z09444
Black PortBlue Port EC-6
- EMISSION CONTROL (2JZ-GTE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
1243 Author: Date:
1997 SUPRA (RM502U)
(b) Blow air (4.71 kPa (48 gf/cm2, 0.68 psi)) into port A, and
check that air does not flow from the other ports.
(c) Blow air (4.71 kPa (48 gf/cm
2, 0.68 psi)) into port B, and
check that air does not flow from the other ports.
If operation is not as specified, replace the charcoal canister.
7. CLEAN FILTER IN CANISTER
Clean the filter by blowing 294 kPa (3 kgf/cm
2, 43 psi) of com-
pressed air into port C while holding port A and B closed.
NOTICE:
Do not attempt to wash the canister.
No activated carbon should come out.
8. REINSTALL CHARCOAL CANISTER
9. INSPECT VSV FOR EVAP
(See page SF-71)
10. REMOVE CHECK VALVE
11. INSPECT CHECK VALVE
(a) Check that air flows from the blue port to the black port.
(b) Check that air does not flow from the black port to the blue
port.
If operation is not as specified, replace the check valve.
12. REINSTALL CHECK VALVE
HINT:
Install the check valve with the black port facing the purge port
side of the throttle body.
Page 1275 of 1807

S02980
FilterCap
S02981
Vacuum Gauge
EC047-02
- EMISSION CONTROL (2JZ-GTE)EXHAUST GAS RECIRCULATION (EGR) SYSTEM
EC-7
1244 Author: Date:
1997 SUPRA (RM502U)
EXHAUST GAS RECIRCULATION
(EGR) SYSTEM
INSPECTION
1. CHECK 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 atmospheric
side (outward).
2. INSTALL VACUUM GAUGE
Using a 3-way connector, connect a vacuum gauge to the hose
between the EGR valve and EGR vacuum modulator.
3. INSPECT SEATING OF EGR VALVE
Start the engine and check that the engine starts and runs at
idle.
4. INSPECT VSV OPERATION WITH COLD ENGINE
(a) M/T
The coolant temperature should be below 50°C (122°F).
(1) Start the engine and check idling.
(2) When idling with the lever shifting in the N position,
press accelerator pedal slowly to hold the engine
speed at 1,600 - 1,800 rpm.
(3) Check that the vacuum gauge indicates zero.
(b) A/T
The coolant temperature should be below 65°C (149°F).
(1) Chock the 4 wheels.
(2) Fully apply the parking brake.
(3) Connect a tachometer to the engine.
(4) Start the engine and check idle.
(5) Keep your foot pressed firmly on the brake pedal.
(6) Shift into the D position. Press the accelerator pedal
slowly to hold the engine speed at 1,600 - 1,800
rpm.
(7) Check that the vacuum gauge indicates zero.
5. INSPECT VSV OPERATION WITH HOT ENGINE
(a) M/T
Warm up the engine. The coolant temperature in 50°C
(122°F) or more.
(1) When idling with the lever shifting in the N position,
press accelerator pedal slowly to hold the engine
speed at 1,600 - 1,800 rpm.
(2) Check that the vacuum gauge indicates low vacu-
um momentarily.
Page 1276 of 1807

S02982
To Intake
Manifold
S02983
Engine Stopped
Air PQ
S02984
Engine at
3,500 rpm
Air PQ EC-8
- EMISSION CONTROL (2JZ-GTE)EXHAUST GAS RECIRCULATION (EGR) SYSTEM
1245 Author: Date:
1997 SUPRA (RM502U)
(b) A/T
Warm up the engine. The coolant temperature in 65°C
(149°F) or more.
(1) Chock the 4 wheels.
(2) Fully apply the parking brake.
(3) Connect a tachometer to the engine.
(4) Start the engine and check idling.
(5) Keep your foot pressed firmly on the brake pedal.
(6) Shifting into the D position. Press the accelerator
pedal slowly to hold the engine speed at 1,600 -
1,800 rpm.
(7) Check that the vacuum gauge indicates low vacu-
um.
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 their proper locations.
If no problem is found during this inspection, system is normal;
otherwise inspect each part.
8. INSPECT VSV FOR EGR
(See page SF-69)
9. DISCONNECT VACUUM HOSES FROM EGR VACUUM
MODULATOR
Disconnect the 2 vacuum hoses from ports P and Q of the EGR
vacuum modulator.
10. INSPECT EGR VACUUM MODULATOR OPERATION
(a) Block port P with your finger.
(b) Blow air into port Q, and check that 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 resis-
tance to air flow.
11. RECONNECT VACUUM HOSES TO EGR VACUUM
MODULATOR
Reconnect the 2 vacuum hoses to the proper locations.
Page 1277 of 1807

S02985
S04753
S02988
- EMISSION CONTROL (2JZ-GTE)EXHAUST GAS RECIRCULATION (EGR) SYSTEM
EC-9
1246 Author: Date:
1997 SUPRA (RM502U)
12. REMOVE EGR PIPE
(a) Loosen the union nut of the EGR pipe.
(b) Remove the 2 bolts, EGR pipe and gasket.
13. REMOVE EGR GAS TEMPERATURE SENSOR
14. REMOVE EGR VALVE
(a) Disconnect these hoses from the EGR valve:
Vacuum hose
Pressure hose
(b) Remove the 2 nuts, EGR valve and gasket.
15. INSPECT EGR VALVE
Check for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve.
16. REINSTALL EGR VALVE
(a) Place a new gasket on the air intake chamber.
(b) Install the EGR valve with the 2 nuts.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(c) Reconnect these hoses to the EGR valve:
Vacuum hose
Pressure hose
17. REINSTALL EGR GAS TEMPERATURE SENSOR
Torque: 20 N´m (200 kgf´cm, 14 ft´lbf)
18. 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 N´m (280 kgf´cm, 20 ft´lbf)
(c) Tighten the union nut of the EGR pipe.
Torque: 64 N´m (650 kgf´cm, 47 ft´lbf)
Page 1278 of 1807
EC048-01
S03438
No.2 Front Exhaust Pipe
Gasket
Pipe Support Bracket
Non-reusable part(with Front TWC)
Gasket
EC-10
- EMISSION CONTROL (2JZ-GTE)THREE-W AY CATALYTIC CONVERTER (TWC)
SYSTEM
1247 Author: Date:
1997 SUPRA (RM502U)
THREE-W AY CATALYTIC CONVERTER (TWC) SYSTEM
COMPONENTS
Page 1279 of 1807
Z18961
Front Exhaust Pipe Gasket
Non-reusable part(with Rear TWC)
Gasket Gasket
Heated Oxygen Sensor
(Bank 1 Sensor 2)
- EMISSION CONTROL (2JZ-GTE)THREE-W AY CATALYTIC CONVERTER (TWC)
SYSTEMEC-1 1
1248 Author: Date:
1997 SUPRA (RM502U)
Page 1280 of 1807
EC049-01
EC-12- EMISSION CONTROL (2JZ-GTE)THREE-W AY CATALYTIC CONVERTER (TWC)
SYSTEM
1249 Author: Date:
1997 SUPRA (RM502U)
INSPECTION
1. CHECK CONNECTIONS FOR LOOSENESS OR DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE
3. 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.
4. CHECK HEAT INSULATOR FOR DAMAGE
5. CHECK FOR ADEQUATE CLEARANCE BETWEEN CATALYTIC CONVERTER AND HEAT INSU-
LATOR