1986 TOYOTA SUPRA charging

TROUBLESHOOTING
HINT: Before troubleshooting the turbocharger, first check the engine itself. (Valve clearance, engine com-
pression, ignition timing etc.)
Check intake air system, and repair or replace parts
as necessary. (See page
EG±144)
1. TURBOCHARGING PRESSURE TOO
LOW
2. RESTRICTED INTAKE SYSTEM
6. ERRATIC TURBOCHARGER
OPERATION
3. LEAK IN INTAKE AIR SYSTEM
4. RESTRICTED EXHAUST SYSTEM
5. LEAK IN EXHAUST SYSTEM
INSUFFICIENT ACCELERATION, LACK OF POWER OR EXCESSIVE FUEL
CONSUMPTION
(Possible Cause) Check Procedure and Correction Method)
Check turbocharging pressure. (See page EG±144)
Turbocharging pressure:
61±75 kPa
(062±0.76 kgf/cm
2,
8.8±10.8 psi)
If the pressure is below specifications, begin
diagnosis from item 2.
Check intake air system, and repair or replace parts
as necessary. (See page
EG±144)
Check intake air system, and repair or replace parts
as necessary. (See page
EG±144)
Check intake air system, and repair or replace parts
as necessary. (See page
EG±144)
Check rotation of turbine shaft. If it does not
turn or turns with a heavy drag, replace the
turbocharger assembly.
Check axial and radial play of turbine shaft.
(See page EG±158)
Maximum axial play : 0.110 mm (0.0045 in.)
Maximum radial play : 0.162 mm (0.0064 in.)
If the play is greater than maximum, replace
the turbocharger assembly. EG±142
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

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)

SERVICE SPECIFICATIONS
SERVICE DATA
 
 
 
Turbocharger 
 
 
Turbocharging pressure
Impeller wheel axial play Limit
Impeller wheel radial play Limit 
 
 
61±75 kPa (0.62±0.76 kgf/cm2, 8.8±10.8 psi)
0.162 mm (0.0064 in.)
0.110 mm (0.0045 in.)
TORQUE SPECIFICATIONS
 
 Part tightened 
 NVm 
 kgfVcm 
 ftVlbf
 Turbocharger x Turbine outlet elbow 25 250 18
 Turbo water pipe x Turbocharger 8.8 90 78 in.Vlbf
 Side bearing housing plate x Turbocharger 8.8 90 78 in.Vlbf
 No.2 air tube x No.2 turbocharger 21 210 15 
 Turbocharger x Exhaust manifold
 
 54
 
 550
 
 40
 Turbo oil pipe x Turbocharger 21 210 15
 Turbo oil pipe x Cylinder block 39 400 29
 Turbocharger stay x Turbocharger 43 440 32 
 Turbocharger stay x Cylinder block
 
 43
 
 440
 
 32
 Exhaust gas control valve x Turbine outlet elbow 69 700 51
 Main heated oxygen sensor x Exhaust gas control valve 20 200 14
 Exhaust gas control valve stay x Exhaust gas control valve 43 440 32 
 Exhaust gas control valve stay x Cylinder block
 
 43
 
 440
 
 32
 Exhaust bypass pipe x Turbine outlet elbow 25 250 18
 Exhaust bypass pipe x Exhaust gas control valve 25 250 18
 Intake air control valve x No.2 turbocharger 21 210 15 
No.4 air tube x No.1 turbocharger 
21 
210 
15 
 No.1 air tube x No.1 turbocharger
 
 21
 
 210
 
 15
 No.2 front exhaust pipe x Exhaust gas control valve 62 630 46
 Front exhaust pipe x No.2 front exhaust pipe 58 590 43
 Pipe support bracket x Transmission 43 440 32 
 
 
Upper front crossmember extension x Front suspension Bolt
Nut
 
 
 
29
33
 
 
 
300
340
 
 
 
22
25
 
 
Front lower arm bracket stay x Front suspension Bolt
Nut 
 
44
59 
 
450
600 
 
33
43
 CAC duct x CAC 4.9 50 43 in.Vlbf
 CAC x Body 13 135 10
EG±162± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

CIRCUIT DESCRIPTION
To control maximum turbocharging pressure the turbocharger system includes a waste gate valve con-
trolled by an actuator. The actuator is controlled by the manifold pressure which is duty controlled by the
VSV based on signals from the ECM.
If the ECM detects the below diagnosis conditions, it operates the fail safe function in which the ECM
stops fuel injection.

Actuator (for waste gate valve)

Short in VSV for waste gate valve circuit

ECM
All conditions below are detected continuously
for 2 sec. or more:
(a) Manifold absolute pressure:
200 kPa (2.0 kgf/cm
2, 29 psi) or more
(b) Throttle valve opening angle:
20° or more
(c) Engine speed: 2,400 rpm or more
DTC 34 Turbo Pressure Malfunction
EG±546± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

8. INSTALL FUEL PIPE SUPPORT
Torque: 14 NVm (145 kgfVcm, 10 ftVlbf)
9. INSTALL LH ENGINE MOUNTING BRACKET AND
INSULATOR ASSEMBLY
HINT: LH mounting bracket is marked ºA u INº.
Torque: 58 NVm (590 kgfVcm, 43 ftVlbf)
10. INSTALL OIL FILTER BRACKET
(a) Check and clean the oil filter bracket installation.
(b) Place a new O±ring in position on the oil filter bracket.
(c) Apply clean engine oil to the O±ring.
(d) Install a new gasket to the union bolt.
(e) Install the oil filter braket with the union bolt.
Torque: 88 NVm (900 kgfVcm, 65 ftVlbf)
11. INSTALL NO.2 WATER BYPASS PIPE
(a) Install a new gasket to the water pump.
(b) 2JZ±GE:
Install the water bypass pipe with the bolt and 2 nuts.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(c) 2JZ±GTE:
Install the water bypass pipe with the 2 bolts and 2 nuts.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
12. 2JZ±GTE:
INSTALL OIL COOLER
(See oil cooler installation in Lubrication System)
13. INSTALL OIL FILTER
(See oil and filter replacement in Lubrication System)
14. INSTALL CYLINDER HEAD
(See cylinder head installation)
15. INSTALL TIMING PULLEYS AND BELT
(See timing belt installation)
16. INSTALL GENERATOR
(See generator installation in Charging System)
17. REMOVE ENGINE STAND FROM ENGINE
18. M/T:
INSTALL FLYWHEEL
HINT: The flywheel bolts are tightened in 2 progressive step,
(b) and (d).
(a) Install the flywheel on the crankshaft.
(b) Install and uniformly tighten the 8 bolts, in several passes, in
the sequence shown.
Torque: 49 NVm (500 kgfVcm, 36 ftVlbf)
EG±122± ENGINEENGINE MECHANICAL

WATER PUMP REMOVAL
1. 2JZ±GTE:
REMOVE NO.1 AIR HOSE
2. 2JZ±GE:
REMOVE AIR CLEANER, VAF METER AND INTAKE AIR
CONNECTOR PIPE ASSEMBLY
(See step 6 in engine removal in Engine Mechanical)
3. 2JZ±GTE:
REMOVE AIR CLEANER AND MAF METER ASSEMBLY
(See step 7 in engine removal in Engine Mechanical)
4. REMOVE RADIATOR ASSEMBLY
(See radiator removal)
5. 2JZ±GTE M/T:
REMOVE DRIVE BELT TENSIONER DAMPER
(See step 2 in timing belt removal in Engine Mechanical)
6. REMOVE DRIVE BELT, FAN, FLUID COUPLING
ASSEMBLY AND WATER PUMP PULLEY
(a) Loosen the 4 nuts holding the fluid coupling to the water
pump.
(b) Loosen the drive belt tension by turning the drive belt
tensioner clockwise, and remove the drive belt.
(c) Remove the 4 nuts, the fan, fluid coupling assembly and
water pump pulley.
7. REMOVE WATER INLET, LOWER RADIATOR HOSE
ASSEMBLY AND THERMOSTAT
(See step 2 to 4 in thermostat removal)
8. REMOVE TIMING BELT
(See steps 4 to 15 in timing belt removal in Engine Me-
chanical)
9. 2JZ±GTE:
REMOVE GENERATOR
(See step 6 in generator removal in Charging System)
10. 2JZ±GE Except California:
REMOVE EXHAUST MANIFOLD HEAT INSULATOR EG±334
± ENGINECOOLING SYSTEM

2. INSTALL IDLER PULLEY
(See step 2 in timing belt installation in Engine Mechani-
cal)
3. 2JZ±GTE:
INSTALL WATER OUTLET AND NO.1 WATER BYPASS
PIPE
(a) Install 2 new O±rings to the No.1 water bypass pipe.
(b) Apply soapy water to the O±rings.
(c) Install the No.1 water pass pipe to the water pump.
(d) Install a new gasket and the water outlet with the 2 bolts.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(e) Connect the ECT sensor and sender gauge connectors.
4. 2JZ±GE:
INSTALL WATER BYPASS OUTLET AND NO.1 WATER
BYPASS PIPE
(a) Install 2 new O±rings to the No.1 water bypass pipe.
(b) Install a new O±ring and the water bypass outlet with the 2
bolts.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
5. 2JZ±GTE:
CONNECT TURBO WATER HOSES TO WATER OUTLET
6. 2JZ±GE Except California:
INSTALL EXHAUST MANIFOLD HEAT INSULATOR
7. 2JZ±GTE:
INSTALL GENERATOR
(See generator installation in Charging System)
8. INSTALL TIMING BELT
(See steps 10 to 14 in timing belt installation in Engine
Mechanical)
9. INSTALL WATER INLET AND LOWER RADIATOR HOSE
ASSEMBLY
(See thermostat installation)
10. INSTALL WATER PUMP PULLEY, FAN, FLUID COUPLING
ASSEMBLY AND DRIVE BELT
(a) Align the matchmarks, and install the water pump pulley, the
fan and fluid coupling assembly with the 4 nuts.
(b) Install the drive belt by turning the drive belt tensioner
clockwise.
(c) Stretch the belt tight, and tighten the 4 nuts.
Torque: 16 NVm (165 kgfVcm, 12 ftVlbf)
EG±338± ENGINECOOLING SYSTEM