TOYOTA SUPRA 1986 Service Repair Manual

SERVICE SPECIFICATIONS
SERVICE DATA
 
 Fuel pressure
regulator 
 Fuel pressure at no vacuum 
 226±275 kPa (2.3±2.8 kgf/cm2, 33±40 psi)
 Fuel pump Resistance at 20°C (68°F) 0.1±3.0
 
 
 
 
Injector 
 
 
 
Resistance
Injection volume
Difference between each cylinder
Fuel leakage 
 
 
 
Approx. 1.95

124±144 cm3 (7.6±8.8 cu in.) per 15 sec.
10 cm
3 (0.6 cu in.) or less
One drop or less per minute
 
 
 
 
MAF meter 
 
 
 
Resistance (THA±E2) at ±20°C (±4°F)
at 0°C (32°F)
at 20°C (68°F)
at 40°C (104°F)
at 60°C (140°F) 
 
 
 
10±20 k

4±7 k

2±3 k

0.9±1.3 k

0.4±0.7 k

 
 
 
Throttle body 
 
 
Throttle body fully closed angle
Dashpot setting speed
Throttle opener setting speed 
 
 
10°
2,300 + 400 rpm
1,500 + 200 rpm
 
 
 
 
 
 
Throttle
position
sensor 
 
 
 
 
 
Clearance between stop screw and lever
0 mm (0 in.) VTA±E2
0.40 mm (0.016 in.) IDL±E2
0.60 mm (0.024 in.) IDL±E2
Throttle valve fully open VTA±E2
± VC±E2 
 
 
 
 
 
0.34±6.3 k

0.5 k
or less
Infinity
2.4±11.2 k

3.1±7.2 k

 
 
 
 
 
Sub±throttle
position
sensor 
 
 
 
 
Clearance between stop screw and lever
0 mm (0 in.) VTA±E2
0.30 mm (0.012 in.) IDL±E2
0.50 mm (0.020 in.) IDL±E2
Throttle valve fully open VTA±E2
± VC±E2 
 
 
 
 
0.3±6.3 k

0.5 k
or less
Infinity
2.0±10.8 k

3.5±6.5 k

 
 
Sub±throttle
actuator 
 
Resistance ACM±A and A±, BCM±B and B± 
 
0.82±0.98

 IAC valve Resistance B1 (or B2)±Others 18±24

 
 
Solenoid
resistor 
 
Resistance +B±Others 
 
Approx. 6

 
 
 
VSV for Fuel
pressure
control 
 
 
Resistance at 20°C (68°F) 
 
 
33±39

 
 
VSV for intake
air control
valve 
 
Resistance at 20°C (68°F) 
 
38.5±44.5

 
 
 
VSV for
exhaust gas
control valve 
 
 
Resistance at 20°C (68°F) 
 
 
38.5±44.5

 
 VSV for waste
gate valve 
 Resistance at 20°C (68°F) 
 22±26

 
 
 
VSV for
exhaust
bypass valve 
 
 
Resistance at 20°C (68°F) 
 
 
22±26

± ENGINESFI SYSTEM (2JZ±GTE)EG±327

 VSV for EVAP Resistance at 20°C (68°F) 30±34

 VSV for EGR Resistance at 20°C (68°F) 30±34

 
 
 
 
 
ECT sensor 
 
 
 
 
Resistance at ±20°C (±4°F)
at 0°C (32°F)
at 20°C (68°F)
at 40°C (104°F)
at 60°C (140°F)
at 80°C (176°F) 
 
 
 
 
10±20 k

4±7 k

2±3 k

0.9±1.3 k

0.4±0.7 k

0.2±0.4 k

 
 
 
EGR gas
temperature
sensor 
 
 
Resistance at 50°C (122°F)
at 100°C (212°F)
at 150°C (302°F) 
 
 
64±97 k

11±16 k

2±4 k

 Main heated
oxygen sensor Heater coil resistance at 20°C (68°F) 11±16

 
 Sub heated
oxygen sensor 
 Heater coil resistance at 20°C (68°F) 
 11±16

 Fuel cut rpm Fuel return rpm 1,100 rpm
TORQUE SPECIFICATIONS
 Part tightened NVm kgfVcm ftVlbf
Fuel line for union bolt2930022 for flare nut 30 310 22 Fuel pressure regulator x Delivery pipe 8.8 90 78 in.Vlbf Delivery pipe x Intake manifold 21 210 15 Injector holder x Delivery pipe 7.8 80 69 in.Vlbf Fuel inlet pipe x Delivery pipe 41 420 30 Fuel return pipe x Fuel pressure regulator 27 280 20 Air intake chamber x Intake manifold 27 280 20 Manifold stay x Air intake chamber 39 400 29
 Manifold stay x Cylinder head 39 400 29
 EGR pipe x Cylinder head 27 270 20
 EGR pipe x EGR valve 64 650 47
 Control cable bracket x Air intake chamber 19 195 14
 Air intake chamber stay x Intake manifold 19 195 14
 Air intake chamber stay x Control cable bracket 19 195 14
 
 
Fuel pressure pulsation damper x Fuel pipe support
for SST 
 
41
35 
 
420
350 
 
30
25
 Fuel tank band x Body 39 400 29
 MAF meter x Air cleaner case 6.9 70 61 in.Vlbf
Throttle body x Air intake chamber2121015 
IAC valve x Air intake chamber
 
21
 
210
 
15 
EGR gas temperature sensor x EGR valve
 
20
 
200
 
14 Knock sensor x Cylinder block 44 450 33 Main heated oxygen sensor x Exhaust manifold 20 200 14 Sub heated oxygen sensor x Center exhaust pipe 20 200 14 
 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
EG±328± ENGINESFI SYSTEM (2JZ±GTE)

09205±76030Cylinder Head Setting Bolt
Tightening Adaptor
09268±41045Injection Measuring Tool Set
(09268±41070)No.4 Union
(09268±41090)No.7 Union
(90405±09015)No.1 Union
09268±45012 EFI Fuel Pressure Gauge
ECT sensor
09612±24014 Steering Gear Housing Overhaul
Tool Set
(09617±24011) Steering Rack Wrench
09631±22020 Power Steering Hose Nut
14 x 17 mm Wrench Set
09808±14010Fuel Sender Gauge Tool Assy
09816±30010 Oil Pressure Switch Socket
09842±30070 Wiring ªFº EFI InspectionInjector
Knock sensor
Fuel line flare nut
Fuel pressure pulsation damper
SFI SYSTEM (2JZ±GE)
PREPARATION
SST (SPECIAL SERVICE TOOLS)
± ENGINESFI SYSTEM (2JZ±GE)EG±187

09843±18020 Diagnostic Check Wire
09990±01000Engine Control Computer Check
Harness ªAº
RECOMMENDED TOOLS
09082±00050 TOYOTA Electrical Tester Set
09200±00010Engine Adjust Kit
09258±00030 Hose Plug SetPlug for vacuum hose, fuel
hose etc.
EQUIPMENT
 Carburetor cleaner 
 
 Graduated cylinder 
 Injector
 Soft brush 
 Sound scope Injector
 Tachometer 
 Torque wrench 
 
 Vacuum gauge
 
 
COOLANT 
 Item
 
 Capacity
 
 Classification
 
 
Engine coolant (w/ Heater) M/T
A/T 
 
7.3 liters (7.7 US qts, 6.4 lmp. qts)
8.3 liters (8.8 US qts, 7.3 lmp. qts) 
 
Ethylene±glycol base
EG±188± ENGINESFI SYSTEMS (2JZ±GE)

PRECAUTION
1. Before working on the fuel system, disconnect the
negative (±) terminal cable from the battery.
HINT: Any diagnostic trouble code retained by the computer
will be erased when the negative (±) terminal cable is discon-
nected.
Therefore, if necessary, read the diagnosis before discon-
necting the negative (±) terminal cable from the battery.
2. Do not smoke or work near an open flame when working
on the fuel system.
3. Keep gasoline away from rubber or leather parts.
MAINTENANCE PRECAUTIONS
1. PRECAUTION WHEN CONNECTING GAUGE
(a) Use ba tte ry as th e po we r so u rce fo r th e timin g lig h t,
tachometer, etc.
(b) Connect the tester probe of a tachometer to the terminal IG

of the DLC1.
2. IN EVENT OF ENGINE MISFIRE, FOLLOWING
PRECAUTIONS SHOULD BE TAKEN
(a) Check proper connection of battery terminals, etc.
(b) Handle high±tension cords carefully.
(c) After repair work, check that the ignition coil terminals and all
other ignition system lines are reconnected securely.
(d) When cleaning the engine compartment, be especially
careful to protect the electrical system from water.
3. PRECAUTIONS WHEN HANDLING OXYGEN SENSOR
(a) Do not allow oxygen sensor to drop or hit against an object.
(b) Do not allow the sensor to come into contact with water.
± ENGINESFI SYSTEM (2JZ±GE)EG±189

IF VEHICLE IS EQUIPPED WITH MOBIL
RADIO SYSTEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication sys-
tem, refer to the precaution in the IN section.
AIR INDUCTION SYSTEM
1. Separation of the engine oil dipstick, oil filler cap, PCV hose,
etc. may cause the engine to run out of tune.
2. Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will cause air suction and cause the engine to run out
of tune.
ELECTRONIC CONTROL SYSTEM
1. Before removing SFI wiring connectors, terminals, etc., first
disconnect the power by either turning the ignition switch
OFF or disconnecting the negative (±) terminal cable from the
battery.
HINT: Always check the diagnostic trouble code before dis-
connecting the negative (±) terminal cable from the battery.
2. When installing the battery, be especially careful not to
incorrectly connect the positive (+) and negative (±) cables.
3. Do not permit parts to receive a severe impact during removal
or installation. Handle all SFI parts carefully, especially the
ECM.
4. Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal contact
can cause further troubles.
5. Do not open the ECM cover.
6. When inspecting during rainy weather, take care to prevent
entry of water. Also, when washing the engine compartment,
prevent water from getting on the SFI parts and wiring
connectors.
7. Parts should be replaced as an assembly.
8. Care is required when pulling out and inserting wiring
connectors.
(a) Release the lock and pull out the connector, pulling on the
connectors.
(b) Fully insert the connector and check that it is locked. EG±190
± ENGINESFI SYSTEMS (2JZ±GE)

9. Use SST for inspection or test of the injector or its wiring
connector.
SST 09842±30070
FUEL SYSTEM
1. When disconnecting the high pressure fuel line, a large
amount of gasoline will spill out, so observe the following
procedures:
(a) Disconnect the fuel pump connector.
(b) Start the engine. After the engine has stopped on its own,
turn off the ignition switch.
(c) Put a container under the connection.
(d) Slowly loosen the connection.
(e) Disconnect the connection.
(f) Plug the connection with a rubber plug.
(g) Reconnect the fuel pump connector.
2. When connecting the flare nut or union bolt on the high
pressure pipe union, observe the following procedures:
Union Bolt Type:
(a) Always use a new gasket.
(b) Tighten the union bolt by hand.
(c) Tighten the union bolt to the specified torque.
Torque: 29 NVm (300 kgfVcm, 22 ftVlbf)
Flare Nut Type:
(a) Apply a light coat of engine oil to the flare nut, and tighten the
flare nut by hand.
(b) Using SST, tighten the flare nut to specified torque.
SST 09631±22020
Torque: 30 NVm (310 kgfVcm, 22 ftVlbf)
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).
± ENGINESFI SYSTEM (2JZ±GE)EG±191

3. Observe the following precautions when removing and
installing the injectors.
(a) Never reuse the O±ring.
(b) When placing a new O±ring on the injector, take care not to
damage it in any way.
(c) Coat a new O±ring with spindle oil or gasoline before
installing±never use engine, gear or brake oil.
4. Install the injector to the delivery pipe and intake manifold as
shown in the illustration.
5. Check that there are no fuel leaks after doing maintenance
anywhere on the fuel system.
(a) Using SST, connect terminals +B and FP of the DLC 1.
SST 09843±18020
(b) With engine stopped, turn the ignition switch ON.
(c) Pinch the fuel return hose.
The pressure in the high pressure line will rise to approx. 392
kPa (4 kgf/cm
2, 57 psi). In this state, check to see that there
are no leaks from any part of the fuel system.
NOTICE: Always pinch the hose. Avoid bending as it may
cause the hose to crack.
(d) Turn the ignition switch OFF.
(e) Remove the SST from the DLC1.
SST 09843±18020 EG±192
± ENGINESFI SYSTEM (2JZ±GE)

FUEL PUMP
ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
(a) Using SST, connect terminals +B and FP of the DLC 1.
SST 09843±18020
(b) Turn the ignition switch ON.
NOTICE: Do not start the engine.
(c) Check that there is pressure in the fuel inlet hose from the fuel
filter.
HINT: If there is fuel pressure, you will hear the sound of fuel
flowing.
If there is no pressure, check the following parts:
wFuse
wEFI main relay
wFuel pump
wECM
wWiring connections
(d) Turn the ignition switch OFF.
(e) Remove the SST from the DLC1.
SST 09843±18020
2. CHECK FUEL PRESSURE
(a) Check the battery voltage is above 12 V.
(b) Disconnect the negative (±) terminals cable from the battery.
(c) Remove the 2 nuts, and disconnect the No.2 vacuum pipe
from the air intake chamber and intake manifold.
(d) Remove the union bolt and 2 gaskets, disconnect the fuel
inlet pipe from the delivery pipe.
CAUTION:

Put a shop towel under the delivery pipe.

Slowly loosen the union bolt.
(e) Install the fuel inlet pipe and SST (pressure gauge) to the
delivery pipe with the 3 gaskets and SST (union bolt).
SST 09268±45012
Torque: 42 NVm (420 kgfVcm, 30 ftVlbf)
(f) Wipe off any splattered gasoline.
(g) Using SST, connect terminals +B and FP of the DLC 1.
SST 09843±18020
± ENGINESFI SYSTEM (2JZ±GE)EG±193

(h) Reconnect the negative (±) terminal cable to the battery.
(i) Turn the ignition switch ON.
(j) Measure the fuel pressure.
Fuel pressure:
265±304 kPa (2.7±3.1 kgf/cm
2, 38±44 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the following parts:
wFuel hoses and connections
wFuel pump
wFuel filter
wFuel pressure regulator
(k) Remove the SST from the DLC1.
SST 09843±18020
(l) Start the engine.
(m) Disconnect the vacuum sensing hose from the fuel pressure
regulator, and plug the hose end.
(n) Measure the fuel pressure at idle.
Fuel pressure:
265±304 kPa (2.7±3.1 kgf/cm
2, 38±44 psi)
(o) Reconnect the vacuum sensing hose to the fuel pressure
regulator.
(p) Measure the fuel pressure at idle.
Fuel pressure:
196±235 kPa (2.0±2.4 kgf/cm
2, 28±34 psi)
If pressure is not as specified, check the vacuum sensing
hose and fuel pressure regulator.
(q) Stop the engine.
(r) Check that the fuel pressure remains as specified for 5
minutes after the engine has stopped.
Fuel pressure:
147 kPa (1.5 kgf/cm
2, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure
regulator and/or injectors.
(s) After checking fuel pressure, disconnect the negative (±)
terminal cable from the battery and carefully remove the SST
to prevent gasoline from splashing.
SST 09268±45012
(t) Install the fuel inlet pipe to the delivery pipe with 2 new
gaskets and the union bolt.
Torque: 42 NVm (420 kgfVcm2, 30 ftVlbf)
(u) Install the No.2 vacuum pipe with the 2 nuts.
Torque: 27 NVm (270 kgfVcm2, 20 ftVlbf)
(v) Reconnect the negative (±) terminal cable to the battery.
(w) Check for fuel leaks.
(See item 5 in fuel system in precaution) EG±194
± ENGINESFI SYSTEM (2JZ±GE)