1986 TOYOTA SUPRA tow

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:
wFuses
wEFI No.2 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 (±) terminal cable from the battery.
(c) Remove the union bolt and 2 gaskets, disconnect the fuel
inlet hose from the fuel filter.
CAUTION:
wPut a suitable container or shop towel under the fuel filter.
wSlowly loosen the union bolt.
(d) Install the fuel inlet hose and SST (pressure gauge) to the
fuel filter with the 3 gaskets and SST (union bolt).
SST 09268±45012
Torque: 29 NVm (300 kgfVcm, 22 ftVlbf)
(e) Wipe off any splattered gasoline.
(f) Using SST, connect terminals +B and FP of the DLC 1.
SST 09843±18020 EG±264
± ENGINESFI SYSTEM (2JZ±GTE)

12. REMOVE AIR INTAKE CHAMBER ASSEMBLY
(a) Remove the bolt, and disconnect the ground cable from the
intake manifold.
(b) Remove the 2 bolts holding the engine wire protector to the
intake manifold.
(c) Disconnect the 2 clamps of the engine wire protector from the
brackets.
(d) Remove the 5 bolts, 2 nuts and engine wire bracket, and
disconnect the air intake chamber assembly from the intake
manifold.
INSTALLATION HINT: Uniformly tighten the bolts and nuts in
several passes.
Torque: 27 NVm (280 kgfVcm, 20 ftVlbf)
(e) Disconnect the water bypass hose from the IAC valve.
(f) Remove the gasket.
INSTALLATION HINT: Use a new gasket.
13. DISCONNECT WIRE CLAMPS AND CONNECTORS
Disconnect these connectors and clamps:
(1) 6 injectors connectors
INSTALLATION HINT: The No.1, No.3 and No.5 injector con-
nectors are dark gray, and the No.2, No.4 and No.6 injector
connectors are gray.
(2) 2 camshaft position sensor connectors
(3) 3 engine wire clamps from injector holders
14. DISCONNECT FUEL INLET PIPE FROM DELIVERY PIPE
Remove the union bolt and 2 gaskets, and disconnect the in-
let pipe from the delivery pipe.
INSTALLATION HINT: Use 2 new gaskets.
Torque: 41 NVm (420 kgfVcm, 30 ftVlbf)
CAUTION:
wPut a shop towel under the delivery pipe.
wSlowly loosen the union bolt.
± ENGINESFI SYSTEM (2JZ±GTE)EG±277

15. DISCONNECT FUEL RETURN PIPE FROM FUEL
PRESSURE REGULATOR
Remove the union bolt and 2 gaskets, and disconnect the
fuel pipe from the pressure regulator.
INSTALLATION HINT: Use 2 new gaskets.
Torque: 27 NVm (280 kgfVcm, 20 ftVlbf)
CAUTION:
wPut a shop towel under the pressure regulator.
wSlowly loosen the union bolt.
16. REMOVE DELIVERY PIPE AND INJECTORS
(a) Remove the 6 bolts and 3 injector holders.
Torque: 7.8 NVm (80 kgfVcm, 69 in.Vlbf)
(b) Remove the 6 insulators from the injectors.
INSTALLATION HINT: Use 6 new insulators.
(c) Re mo ve th e 2 bo lts, th e de live ry pip e an d 6 in je cto rs
assembly.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(d) Remove the 2 spacers from the intake manifold. EG±278
± ENGINESFI SYSTEM (2JZ±GTE)

IAC VALVE REMOVAL
1. DRAIN ENGINE COOLANT
2. DISCONNECT IAC VAVE 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.
IAC VALVE INSPECTION
INSPECT IAC VALVE OPERATION
(a) Apply battery voltage to terminals B1 and B2, and while
repeatedly grounding S1±S2±S3±S4±S 1 in sequence, and
check that the valve moves toward the closed position.
(b) Apply battery voltage to terminals B1 and B2, and while
repeatedly grounding S4±S3±S2±S1±S 4 in sequence,
check that the valve moves toward the open position.
If operation is not as specified, replace the IAC valve.
± ENGINESFI SYSTEM (2JZ±GTE)EG±297

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

9. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY
(a) Disconnect these connectors and hoses:
(1) Throttle position sensor connector
(2) IAC valve connector
(3) VSV connector for EGR
(4) PCV hose from intake air connector
(5) Water bypass hose (from No.2 water bypass pipe) from
throttle body
(6) California only:
Air hose from IAC valve
(b) Remove the nut holding the VSV for the ACIS to the air intake
chamber.
(c) Remove the 4 bolts and 2 nuts holding the intake air
connector to the air intake chamber.
(d) Disconnect these hoses, and remove the throttle body, intake
air connector assembly and gasket.
(1) 3 vacuum hoses (from No.2 vacuum pipe) from No.1
vacuum pipe
(2) Water bypass hose (from water outlet) from throttle body
(3) Vacuum hose (from actuator for ACIS) from No.1 vacu-
um pipe
10. REMOVE AIR INTAKE CHAMBER STAYS
(a) Remove the bolt, nut and No.1 stay.
(b) Remove the bolt, nut and No.2 stay.
11. Except California:
DISCONNECT VACUUM SENSING HOSE FROM FUEL
PRESSURE REGULATOR
12. DISCONNECT FUEL INLET PIPE FROM DELIVERY PIPE
Remove the union bolt and 2 gaskets, and disconnect the in-
let pipe from the delivery pipe.
CAUTION:
 Put a shop towel under the delivery pipe.
± ENGINESFI SYSTEM (2JZ±GE)EG±205

Slowly loosen the union bolt.
13. D I S C O N N E C T F U E L R E T U R N P I P E F R O M F U E L
PRESSURE REGULATOR
Remove the union bolt and 2 gaskets, and disconnect the
fuel pipe from the pressure regulator.
CAUTION:
Put a shop towel under the pressure regulator.
Slowly loosen the union bolt.
14. DISCONNECT INJECTOR CONNECTORS
Disconnect the 6 injector connectors.
15. DISCONNECT ACTUATOR FOR ACIS FROM AIR INTAKE
CHAMBER
(a) Remove the 2 bolts, and disconnect the actuator from the air
intake chamber.
(b) Wrap the actuator with adhesive tape and attach it to the
intake chamber.
NOTICE: Do not apply any force on the actuator rod and pre-
vent the rod clip from detaching.
16. REMOVE DELIVERY PIPE AND INJECTORS
(a) Remove the 3 bolts and delivery pipe together with the 6
injectors.
NOTICE: Be careful not to drop the injectors when removing
the delivery pipe.
(b) Remove the 6 insulators (Except California) and 3 spacers
from the intake manifold. EG±206
± ENGINESFI SYSTEM (2JZ±GE)

IAC VALVE REMOVAL
1. REMOVE THROTTLE BODY
(See throttle body removal)
2. REMOVE IAC VALVE FROM THROTTLE BODY
Remove the 2 screws, IAC valve and O±ring.
IAC VALVE INSPECTION
INSPECT IAC VALVE OPERATION
(a) Apply battery voltage to terminals B1 and B2, and while
repeatedly grounding S1±S2±S3±S4±S 1 in sequence, and
check that the valve moves toward the closed position.
(b) Apply battery voltage to terminals B1 and B2, and while
repeatedly grounding S4±S3±S2±S1±S 4 in sequence,
check that the valve moves toward the open position.
If operation is not as specified, replace the IAC valve.
IAC VALVE INSTALLATION
1. INSTALL IAC VALVE TO THROTTLE BODY
(a) Install a new O±ring on the throttle body.
(b) Install the IAC valve with the 2 screws.
2. INSTALL THROTTLE BODY
(See throttle body installation)
± ENGINESFI SYSTEM (2JZ±GE)EG±227