1995 TOYOTA SUPRA engine

1. TURBOCHARGING HEAT INSULATOR
RESONANCE
2. EXHAUST PIPE LEAKING OR
VIBRATING
3. ERRATIC TURBOCHARGER
OPERATION
ABNORMAL NOISE
(Possible Cause) (Check Procedure and Correction Method)
Check for loose, improperly installed or deformed
insulator mounting bolts, and repair or replace as
necessary.
Check for deformed exhaust pipe, loose mounting
bolts or damaged gasket, and repair or replace as
necessary.
Refer to item 6 of INSUFFICIENT ACCELERATION,
LACK OF POWER OR EXCESSIVE FUEL
CONSUMPTION.
EXCESSIVE OIL CONSUMPTION OR WHITE EXHAUST
(Possible Cause) (Check Procedure and Correction Method)
FAULTY TURBOCHARGER SEALCheck for oil leakage in exhaust system.
wRemove the turbine elbow from the turbochar-
ger and check for excessive carbon deposits on
the turbine wheel. Excessive carbon deposits in-
dicate a faulty turbocharger.
Check for oil leakage in intake air system.
wCheck for axial and radial play of turbine shaft
and replace the turbocharger if necessary.
(See page EG±158)
Maximum axial play : 0.110 mm (0.0045 in.)
Maximum radial play : 0.162 mm (0.0064 in.)
NOTICE: Some oil mist in the blowby from the
PCV is normal.
Do not mistake it for an oil leak from the
turbocharger.
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±143

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)