TOYOTA SUPRA 1997 Service Repair Manual

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.

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.

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.

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.

SF0HC-01
P18728
IAC Valve Connector
IAC Valve

GasketAir Hose
Water Bypass Hose
Water Bypass Hose

Non-reusable partSeal Washer
Check Valve SF-50
- SFI (2JZ-GTE)IDLE AIR CONTROL (IAC) VALVE
1376 Author
: Date
:
1997 SUPRA (RM502U)
COMPONENTS

SF0HD-01
P11386Connector
P11418(1)(2)
(3)
P12820
Check Valve
Seal
Washer
- SFI (2JZ-GTE)IDLE AIR CONTROL (IAC) VALVE
SF-51
1377 Author
: Date
:
1997 SUPRA (RM502U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. DISCONNECT IAC VALVE CONNECTOR
3. REMOVE IAC VALVE
(a) Remove the 2 bolts, and disconnect the IAC valve from
the air intake chamber.
(b) Remove the gasket
.
(c) Disconnect these hoses from the IAC valve, and remove
the IAC valve:
(1) Air hose
(2) Water bypass hose (from No.2 water bypass pipe)
(3) Water bypass hose (from No.4 water bypass pipe)
(d) Remove the seal washer and check valve.

SF0HE-01
P11389
Battery Closed
B1
S1
S2 B2S3
S4
P11388
Battery B1
S1
S2 B2S3
S4 Open SF-52
- SFI (2JZ-GTE)IDLE AIR CONTROL (IAC) VALVE
1378 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION
INSPECT IAC VALVE OPERATION
(a) Apply battery positive voltage to terminals B1 and B2, and
while repeatedly grounding S1 - S2 - S3 - S4 - S1 in se-
quence, and check that the valve moves toward the
closed position.
(b) Apply battery positive voltage to terminals B1 and B2, and
while repeatedly grounding S4 - S3 - S2 - S1 - S4 in se-
quence, check that the valve moves toward the open
position.
If operation is not as specified, replace the IAC valve.

SF0HF-01
P11387
Check Valve
Seal
WasherInside
- SFI (2JZ-GTE)IDLE AIR CONTROL (IAC) VALVE
SF-53
1379 Author
: Date
:
1997 SUPRA (RM502U)
INSTALLATION
1. INSTALL IAC VALVE
(a) Install the check valve and seal washer.
NOTICE:
Be careful of the check valve and seal washer installation
direction.
(b) Connect these hoses:

Air hose

Water bypass hose (from No.2 water bypass
pipe)

Water bypass hose (from No.4 water bypass
pipe)
(c) Install a new gasket and the IAC valve with the 2 bolts.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
2. CONNECT IAC VALVE CONNECTOR
3. FILL WITH ENGINE COOLANT

P11276
EFI Main
Relay
SF0HG-01
P07170
Ohmmeter
No
ContinuityContinuity
Ohmmeter 1
35
2
P07171Battery Ohmmeter
Continuity1
35
2 SF-54
- SFI (2JZ-GTE)EFI MAIN RELAY
1380 Author
: Date
:
1997 SUPRA (RM502U)
EFI MAIN RELAY
INSPECTION
1. REMOVE EFI MAIN RELAY
2. INSPECT EFI MAIN RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
If there is no continuity, replace the relay.
(b) Check that there is no continuity between terminals 3 and
5.
If there is continuity, replace the relay.
3. INSPECT EFI MAIN RELAY OPERATION
(a) Apply battery positive voltage across terminals 1 and 2.
(b) Using an ohmmeter, check that there is continuity be-
tween terminals 3 and 5.
If there is no continuity, replace the relay.
4. REINSTALL EFI MAIN RELAY

P11277
EFI No.2
Relay
SF0HH-01
P07170
Ohmmeter
No
ContinuityContinuity
Ohmmeter 1
35
2
P07171Battery Ohmmeter
Continuity1
35
2
- SFI (2JZ-GTE)EFI NO.2 RELAY
SF-55
1381 Author
: Date
:
1997 SUPRA (RM502U)
EFI NO.2 RELAY
INSPECTION
1. REMOVE EFI NO.2 RELAY
2. INSPECT EFI NO.2 RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
If there is no continuity, replace the relay.
(b) Check that there is no continuity between terminals 3 and
5.
If there is continuity, replace the relay.
3. INSPECT EFI NO.2 RELAY OPERATION
(a) Apply battery positive voltage across terminals 1 and 2.
(b) Using an ohmmeter, check that there is continuity be-
tween terminals 3 and 5.
If there is no continuity, replace the relay.
4. REINSTALL EFI NO.2 RELAY