Page 1497 of 1807
Z13303
Disconnect
PlugThrottle
Opener
Adjusting
Screw
- SFI (2JZ-GTE)THROTTLE BODY
SF-41
1367 Author: Date:
1997 SUPRA (RM502U)
3. INSPECT THROTTLE OPENER
(a) Warm up engine
Allow the engine to warm up to normal operating tempera-
ture.
(b) Check idle speed
Idle speed (Transmission in neutral position):
650 ± 50 rpm
(c) Check throttle opener setting speed
(1) Disconnect the throttle opener vacuum hose from
the throttle body, and plug the throttle body port.
(2) Maintain the engine speed at 2,500 rpm.
(3) Release the throttle valve.
(4) Check that the throttle opener is set.
Throttle opener setting speed: 1,500 ± 200 rpm
(5) Adjust the throttle opener setting speed by turning
the throttle opener adjusting screw.
(6) Reconnect the throttle opener vacuum hose to the
throttle body.
Page 1498 of 1807
SF0H7-01
P18724
Cruise Control Actuator Cable
Throttle Body
Sub-Throttle
Position Sensor
Connector
PS Air Hose Air Hose Gasket
Throttle Position Sensor
Connector
Sub-Throttle Actuator ConnectorEVAP Hose
Water Bypass HoseAccelerator Cable
Non - reusable part SF-42
- SFI (2JZ-GTE)THROTTLE BODY
1368 Author: Date:
1997 SUPRA (RM502U)
COMPONENTS
Page 1499 of 1807
P11327
(4) (3)
(2)
(!) (5)
(6)
P11328
SF0H8-01
P11329
(1)
(2)
(3)
(4)
- SFI (2JZ-GTE)THROTTLE BODY
SF-43
1369 Author: Date:
1997 SUPRA (RM502U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. REMOVE THROTTLE BODY
(a) Disconnect the hose, cables and connectors from the
throttle body:
(1) Air hose
(2) Accelerator cable
(3) Cruise control actuator cable
(4) Throttle position sensor connector
(5) Sub-throttle position sensor connector
(6) Sub-throttle actuator connector
(b) Remove the 2 bolts and 2 nuts, and disconnect the
throttle body from the air intake chamber.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(c) Remove the gasket.
HINT:
Use a new gasket.
(d) Disconnect these hoses from the throttle body, and re-
move the throttle body:
(1) EVAP hose
(2) Water bypass hose (from No.4 water bypass pipe)
(3) Water bypass hose (from cylinder head)
(4) PS air hose
Page 1500 of 1807

SF0H9-02
P11982
P11488
Throttle Lever
Throttle Stop
ScrewVacuum
No
Clearance
Disconnect
P11489
Vacuum
Disconnect
Feeler
Gauge
Z09088
Ohmmeter
VTA
VC
E2
IDL
P11453
SF-44
- SFI (2JZ-GTE)THROTTLE BODY
1370 Author: Date:
1997 SUPRA (RM502U)
INSPECTION
1. CLEAN THROTTLE BODY
(a) Using a soft brush and carburetor cleaner, clean the cast
parts.
(b) Using compressed air, clean all the passages and aper-
tures.
NOTICE:
To prevent deterioration, do not clean the throttle position
sensors, actuator, dashpot and throttle opener.
2. INSPECT THROTTLE VALVE
(a) Disconnect the throttle opener vacuum hose from the
throttle body.
(b) Apply vacuum to the throttle opener.
(c) Check that there is no clearance between the throttle stop
screw and throttle lever when the throttle valve is fully
closed.
(d) Reconnect the vacuum hose to the throttle body.
3. INSPECT THROTTLE POSITION SENSOR
(a) Disconnect the throttle opener vacuum hose from the
throttle body.
(b) Apply vacuum to the throttle opener.
(c) Insert a 0.54 mm (0.021 in.) or 0.70 mm (0.028 in.) feeler
gauge between the throttle stop screw and stop lever.
(d) Using an ohmmeter, measure the resistance between
each terminal.
Clearance between
lever and stop screwBetween terminalsResistance
0 mm (0 in.)VTA - E20.34 - 6.3 kW
0.54 mm (0.021 in.)IDL - E20.5 kW or less
0.70 mm (0.028 in.)IDL - E2Infinity
Throttle valve fully
openVTA - E22.4 - 11.2 kW
-VC - E23.1 - 7.2 kW
4. IF NECESSARY, ADJUST THROTTLE POSITION
SENSOR
(a) Loosen the 2 set screws of the sensor.
Page 1501 of 1807
Z09125
0.65 mm
S00022
Ohmmeter
IDL
E2 Turn
B02446
B02858
0.54 or 0.70 mm
Ohmmeter
E2IDL
P11455
Ohmmeter
A B
A-B-
- SFI (2JZ-GTE)THROTTLE BODY
SF-45
1371 Author: Date:
1997 SUPRA (RM502U)
(b) Insert a 0.65 mm (0.026 in.) feeler gauge between the
throttle stop screw and stop lever.
(c) Connect the tester probe of an ohmmeter to the terminals
IDL and E2 of the sensor.
(d) Gradually turn the sensor clockwise until the ohmmeter
deflects, and secure it with the 2 set screws.
(e) Recheck the continuity between terminals IDL and E2.
Clearance between
lever and stop screwContinuity (IDL - E2)
0.54 mm (0.021 in.)Continuity
0.75 mm (0.028 in.)No continuity
(f) Reconnect the vacuum hose to the throttle body.
5. INSPECT SUB-THROTTLE ACTUATOR
Using an ohmmeter, measure the resistance between the ter-
minals (A and A-,to B and B-).
Resistance: 0.82 - 0.98 W at 20°C (68°F)
If the resistance is not as specified, replace the actuator.
Page 1502 of 1807

P11981
P12006
Throttle Stop Screw
No Clearance
Sub-Throttle
Valve
ClosedThrottle
Valve
Gear
Z09126
Sub-Throttle
Valve
Closed0.41 or
0.48 mm
Z09128
Ohmmeter
E2
IDL
VTA
VC
P12003
SF-46
- SFI (2JZ-GTE)THROTTLE BODY
1372 Author: Date:
1997 SUPRA (RM502U)
6. REMOVE SUB-THROTTLE ACTUATOR
Remove the 4 screws and sub-throttle actuator.
7. INSPECT SUB-THROTTLE VALVE
Check that there is no clearance between the throttle stop
screw and throttle valve gear when the sub-throttle valve is fully
closed.
8. INSPECT SUB-THROTTLE POSITION SENSOR
(a) Set the sub-throttle valve to fully closed position.
(b) Insert a 0.41 mm (0.016 in.) or 0.48 mm (0.019 in.) feeler
gauge between the throttle stop screw and throttle valve
gear.
(c) Using an ohmmeter, measure the resistance between ter-
minals.
Clearance between
lever and stop screwBetween terminalsResistance
0 mm (0 in.)VTA - E20.3 - 6.3 kW
0.41 mm (0.016 in.)IDL - E20.5 kW or less
0.48 mm (0.019 in.)IDL - E2Infinity
Throttle valve fully
openVTA - E22.0 - 10.8 kW
-VC - E23.5 - 6.5 kW
9. NECESSARY, ADJUST SUB-THROTTLE
POSITION SENSOR
(a) Loosen the 2 set screws of the sensor.
Page 1503 of 1807
Z09127
Sub-Throttle
Valve
Closed0.45 mm
S00023
Ohmmeter
E2
IDL
Turn
Z09130
Sub-Throttle
Valve
0.41 or
0.48 mm
Closed
Ohmmeter
E2
IDL
VTA
VC
- SFI (2JZ-GTE)THROTTLE BODY
SF-47
1373 Author: Date:
1997 SUPRA (RM502U)
(b) Set the sub-throttle valve to fully closed position.
(c) Insert a 0.45 mm (0.018 in.) feeler gauge, between the
throttle stop screw and throttle valve gear.
(d) Connect the tester probe of an ohmmeter to the terminals
IDL and E2 of the sensor.
(e) Gradually turn the sensor clockwise until the ohmmeter
deflects, and secure it with the 2 set screws.
(f) Recheck the continuity between terminals IDL and E2.
Clearance between
lever and stop screwContinuity (IDL - E2)
0.41 mm (0.016 in.)Continuity
0.48 mm (0.019 in.)No continuity
10. REINSTALL SUB-THROTTLE ACTUATOR
Install the sub-throttle actuator with the 4 screws.
Page 1504 of 1807
P11385
P11417
Ohmmeter
S4
S3 B1S2 B2
S1
SF0HB-01
- SFI (2JZ-GTE)IDLE AIR CONTROL (IAC) VALVE
SF-49
1375 Author: Date:
1997 SUPRA (RM502U)
IDLE AIR CONTROL (IAC) VALVE
ON-VEHICLE INSPECTION
1. INSPECT IAC VALVE FOR OPERATING SOUND
Check that there is a clicking sound immediately after stopping
the engine.
If operation is not as specified, check the IAC valve, wiring and
ECM.
2. INSPECT IAC VALVE RESISTANCE
NOTICE:
ºColdº and ºHotº in these sentences express the tempera-
ture of the coils themselves.
ºColdº is from -10°C (14°F) to 50°C (122°F) and ºHotº is
from 50°C (122°F) to 100°C (212°F).
Using an ohmmeter, measure the resistance between the ter-
minals (B1 (or B2) to others).
Resistance:
Cold15 - 25 W
Hot20 - 30 W
If resistance is not as specified, replace the IAC valve.