TOYOTA SUPRA 1995 Service Repair Manual

TURBOCHARGER
On±Vehicle Inspection
1. INSPECT INTAKE AIR SYSTEM
Check for leakage or clogging between the air cleaner and
turbocharger inlet and between the turbocharger outlet and
cylinder head.
wClogged air cleaner .... Clean or replace air filter
wHoses collapsed or deformed .... Repair or replace
wLeakage from connections .... Check each
connection and repair
wCracks in components Check and replace
2. INSPECT EXHAUST SYSTEM
Check for leakage or clogging between the cylinder head and
turbocharger inlet and between the turbocharger outlet and
exhaust pipe.
wDeformed components Repair or replace
wForeign material in passages Remove
wLeakage from components Repair or replace
wCracks in components Check and replace
3. INSPECT EXHAUST EXHAUST GAS CONTROL VALVE
OPERATION
(a) Disconnect the air hose from the actuator.
(b) Using SST, apply approx. 49 kPa (0.50 kgf/cm
2, 7.1 psi) of
pressure to the actuator.
SST 09992±00241
(c) Check that the actuator push rod moves.
(d) Reconnect the air hose to the actuator.
If operation is not as specified, replace the control valve as-
sembly.
4. INSPECT TURBOCHARGING PRESSURE
(a) Using a 3±way connector, connect SST (turbocharger
pressure gauge) to the hose between the gas filter and turbo
pressure sensor.
SST 09992±00241
(b) While driving with the engine running at 5,600 rpm or more
with the throttle valve fully open in the 1st gear/ L range,
check the turbocharging pressure.
Standard pressure:
61±75 kPa (0.62±0.76 kgf/cm
2, 8.8±10.8 psi)
If the pressure is less than that specified, check the intake
and exhaust systems for leakage. If there is no leakage, re-
place the turbocharger assembly.
If the pressure is above specification, check if the actuator
hose is disconnected or cracked. If not, replace the turbo-
charger assembly. EG±144
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

VSV for Intake Air Control Valve
(See SFI System)
VSV for Waste Gate Valve
(See SFI System)
VSV for Exhaust Gas Control Valve
(See SFI System)
VSV for Exhaust Bypass Valve
(See SFI System)
Turbo Pressure Sensor
(See SFI System)
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±145

Pressure Tank
COMPONENTS FOR REMOVAL AND
INSTALLATION
EG±146± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

PRESSURE TANK INSPECTION
1. REMOVE PRESSURE TANK
2. INSPECT PRESSURE TANK
(a) Check that air flows from port A to B.
(b) Check that air does not flow from port B to A.
(c) Apply 60.0 kPa (450 mmHg, 17.72 in.Hg) of vacuum to port
A, and check that there is no change in vacuum after 1
minute.
If operation is not as specified, replace the pressure tank.
3. REINSTALL PRESSURE TANK
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±147

Turbocharger
COMPONENTS FOR REMOVAL AND
INSTALLATION
EG±148± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±149

TURBOCHARGER REMOVAL
Installation is in the reverse order of removal.
1. DRAIN ENGINE COOLANT
2. REMOVE ENGINE UNDER COVER
3. DISCONNECT CRUISE CONTROL ACTUATOR CABLE
FROM THROTTLE BODY
4. REMOVE NO.1 AIR HOSE
5. REMOVE AIR CLEANER DUCT
6. REMOVE AIR CLEANER AND MAF METER ASSEMBLY
(a) Remove the 3 bolts.
(b) Loosen the hose clamp, disconnect the air hose from the
intake air connector.
(c) Disconnect the MAF meter wire from the clamp on the air
cleaner case.
(d) Disconnect the MAF meter connector, and remove the air
cleaner and MAF meter assembly. EG±150
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

7. DISCONNECT THEFT DETERRENT HORN FROM BODY
8. REMOVE FRONT LOWER ARM BRACKET STAY
Remove the 2 bolts, nut, plate washer and arm bracket stay.
Torque:
Bolts
44 NVm (450 kgfVcm, 33 ftVlbf)
Nut
59 NVm (600 kgfVcm, 43 ftVlbf)
9. REMOVE UPPER FRONT CROSSMEMBER EXTENSION
Remove the 2 bolts, 2 nuts and crossmember extension.
Torque:
Bolts
29 NVm (300 kgfVcm, 22 ftVlbf)
Nuts
33 NVm (340 kgfVcm, 25 ftVlbf)
10. REMOVE NO.2 FRONT EXHAUST PIPE
(a) Remove the 2 bolts and nuts holding the front exhaust pipe
to the No.2 front exhaust pipe.
Torque: 58 NVm (590 kgfVcm, 43 ftVlbf)
(b) Remove the 2 bolts and pipe support bracket.
Torque: 43 NVm (440 kgfVcm, 32 ftVlbf)
(c) Disconnect the front exhaust pipe from the No.2 exhaust
pipe. Remove the gasket.
INSTALLATION HINT: Use a new gasket.
(d) Remove the 3 nuts, No.2 front exhaust pipe and gasket.
INSTALLATION HINT: Use a new gasket and 3 new nuts.
Torque: 62 NVm (630 kgfVcm, 46 ftVlbf)
11. REMOVE HEAT INSULATOR FOR NO.2 FRONT EXHAUST
PIPE
Remove the 2 bolts, 2 nuts and heat insulator.
12. DISCONNECT A/T OIL COOLER TUBES FROM ENGINE
(a) Remove the bolt and tube clamp, and disconnect the oil
cooler tubes from the bracket (front side) on the generator.
(b) Remove the bolt and tube clamp, and disconnect the oil
cooler tubes from the bracket (rear side) on the cylinder
block.
(c) Remove the bolt and tube bracket (rear side) from the
cylinder block.
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±151

13. DISCONNECT ENGINE WIRE PROTECTOR FROM BODY
Remove the 2 bolts, and disconnect the wire protector from
the body.
14. DISCONNECT HOSES
Disconnect these hoses:
(1) Heater hose from No.3 water bypass pipe
(2) EVAP hose from No.1 vacuum pipe
15. DISCONNECT IAC VALVE PIPE FROM NO.2 AIR TUBE
(a) Disconnect the engine wire from the clamp.
(b) Disconnect these hoses:
(1) Air hose (from No.1 vacuum pipe) from IAC valve pipe
(2) Air hose from No.2 air tube
(c) Disconnect the IAC valve pipe from the clamp.
16. DISCONNECT NO.1 VACUUM PIPE FROM AIR TUBES
(a) Disconnect these connectors:
(1) VSV connector for intake air control valve
(2) VSV connector for exhaust bypass valve
(b) Disconnect the engine wire from the 3 clamps.
(c) Disconnect these hoses:
(1) Air hose from No.4 air tube
(2) Air hose from No.1 air tube
(3) Air hose (from VSV for waste gate valve) from vacuum
pipe
(4) Air hose (from VSV for exhaust gas control valve) from
vacuum pipe
(5) Vacuum hose (from air bypass valve) from No.1 air tube
(6) 2 air hoses (from VSV for exhaust bypass valve) from
vacuum pipe
(7) Air hose (from No.2 air tube) from vacuum pipe
(8) Air hose from VSV for intake air control valve
(9) 2 air hoses (from pressure tank) from vacuum pipe
(d) Remove the 3 bolts, and disconnect the vacuum pipe from
the air tubes. EG±152
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

17. REMOVE VSV ASSEMBLY
(a) Disconnect these hoses:
(1) Air hose from actuator for waste gate valve
(2) Air hose from actuator for exhaust gas control valve
(3) Air hose from hose clamp
(4) Engine wire from wire clamp
(b) Remove the 2 bolts.
(c) Disconnect the 2 VSV connectors, and remove the VSV
assembly.
18. REMOVE AIR TUBES AND INTAKE AIR CONNECTOR
(a) Disconnect the connector and hoses:
(1) Crankshaft position sensor connector from clamp
(2) Water bypass hose (from water pump) from No.1 turbo
water pipe
(3) Water bypass hose (from water outlet) from No.1 turbo
water pipe
(4) Water bypass hose (from water outlet) from No.2 turbo
water pipe
(b) Remove the bolt, and disconnect the No.2 turbo water pipe
from the No.4 air tube.
(c) Remove the 2 bolts, and disconnect the No.1 air tube from
the No.1 turbocharger. Remove the gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(d) Remove the 2 bolts holding the No.4 air tube to the No.1
turbocharger. Remove the gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(e) Disconnect these hoses, and remove the No.4 air tube and
air bypass valve assembly.
(1) Air hose from No.4 air tube
(2) Air hose from intake air connector
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±153