1991 LEXUS SC400 heater

(j) Remove the 3 bolts, the cold start injector, tube, lead wireassembly and gasket.
19. DISCONNECT HEATER WATER HOSES Disconnect the following hoses:
(1) Water hose from water bypass pipe
(2) Water hose from rear water bypass joint
20. DISCONNECT FUEL INLET HOSE FROM DELIVERY PIPE
Remove the pulsation damper and 2 gaskets, and discon-
nect the fuel inlet hose from the delivery pipe.
CAUTION:
w Put a shop towel under the delivery pipe.
w Slowly loosen the union bolts.
21. D I S C O N N E C T F U E L R E T U R N H O S E F R O M F U E L
RETURN PIPE
22. DISCONNECT EGR PIPE FROM RH CYLINDER HEAD Remove the bolt holding the EGR pipe to the RH cylinder
head, and disconnect the EGR pipe.
23. DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD Remove the 2 bolts, and disconnect the engine wire protector
from the intake manifold.
EG±82
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25. CONNECT FUEL RETURN HOSE TO FUEL RETURN PIPE
26. CONNECT FUEL INLET HOSE TO LH DELIVERY PIPE
(a) Temporarily connect the fuel inlet hose to the delivery pipe with 2 new gaskets and pulsation damper.
(b) Install the bolt holding the fuel inlet hose to the delivery pipe.
(c) Using SST tighten the pulsation damper. SST 09631±22020
Torque:
39 NVm (400 kgf Vcm, 29 ft Vlbf)
33 N Vm (340 kgf Vcm, 24 ft Vlbf) for SST
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).
27. INSTALL HEATER WATER HOSES Connect the following noses:
(1) Water hose to water bypass pipe
(2) Water hose to rear water bypass joint
28. INSTALL AIR INTAKE CHAMBER
(a) Install the cold start injector, tube and lead wire assembly with
the 3 bolts.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
(b) Place 4 new gaskets on the intake manifold.
HINT: Gaskets can only be used twice before being replaced.
(c) Place the air intake chamber on the intake manifold.
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1UZ±FE ENGINE ENGINE MECHANICALEG±127
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(l) Install the accelerator bracket with the bolt and stud bolt.
(m) Install 2 new gaskets and union with the union bolt.
Torque: 29 NVm (300 kgf Vcm, 22 ft Vlbf)
(n) Connect the following hoses:
(1) Brake booster vacuum hose to union on air intake cham-
ber
(2) Vacuum hose (from VSV for heater water valve to air in-
take chamber
29. INSTALL THROTTLE BODY
(a) Disconnect the following hoses: (1) PCV hose to throttle body
(2) Water bypass hose to throttle body
(b) Install a new gasket and throttle body with the 2 bolts and 2 nuts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolt 40 mm (1.57 in.) in length.
(c) Install the water bypass pipe (from the rear bypass joint) to the clamp on the engine wire cover.
(d) Connect the following connectors: (1) Throttle position sensor connector
(2) w/ TRAC: Sub±throttle position sensor connector
(3) w/ TRAC: Sub±throttle actuator connector
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30. INSTALL HEATER WATER VALVE
(a) Install the water valve and bracket assembly with the 2 bolts.
(b) Install the engine wire with the bolt.
(c) Connect the VSV connector.
31. INSTALL IAC VALVE
(a) Install a new gasket and IAC valve with the 2 nuts.
Torque: 18 NVm (185 kgf Vcm, 13 ft Vlbf)
(b) Connect the water bypass hose (from the throttle body) to the
IAC valve.
(c) Connect the IAC valve connector.
32. INSTALL EGR VALVE ADAPTOR
(a) Install a new gasket, the EGR valve adaptor and EGR gas temperature sensor connector bracket with the 2 bolts and 2
nuts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolt 20 mm (0.78 in.) in length.
NOTICE: Do not touch the air intake chamber and adaptor sur-
faces of the gasket with your hand.
(b) Connect the PCV hose to the cylinder head.
(c) Connect the EGR gas temperature sensor connector.
EG±130
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22. DISCONNECT POWER STEERING (PS) RESERVOIRTANK AND BRACKET FROM BODY
Remove the 3 bolts, and disconnect the reservoir tank and
bracket assembly.
23. DISCONNECT POWER STEERING (PS) PUMP FROM ENGINE
Remove the nut and 3 bolts, and disconnect the PS pump
from the engine.
HINT: Put aside the PS pump, and suspend it.
24. DISCONNECT AIR CONDITIONING (A/C) COMPRESSOR FROM ENGINE
(a) Disconnect the A/C compressor connector.
(b) Remove the nut, and disconnect the ground cable from the
A/C compressor stay.
(c) Remove the bolt and A/C compressor stay.
(d) Remove the 2 bolts, and disconnect the A/C compressor from the engine.
HINT: Put aside the A/C compressor, and suspend it.
25. DISCONNECT HOSES Disconnect the following hoses and ground strap:
(1) Heater water hose from water bypass hose
(2) Heater water hose from heater water valve
(3) Brake booster hose from union on air intake chamber
(4) Vacuum hose (from VSV for heater water valve) from air
intake chamber
(5) Ground strap from bracket on body.
EG±144
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(i) Remove the bolt holding the engine wire clamp to the heaterwater valve bracket.
(j) Remove the 2 bolts holding the engine wire clamp to the
body.
(k) Pull out the engine wire from the cabin.
NOTICE: Be careful not to damage the engine wire.
28. DISCONNECT SUB HEATED OXYGEN SENSORS FROM FRONT EXHAUST PIPE
(a) Disconnect the 2 wire grommets from the floor panel.
(b) Disconnect the 2 oxygen sensors from the exhaust pipe.
29. REMOVE FRONT EXHAUST PIPE
(a) Remove the 4 bolts holding the pipe support bracket to the transmission.
(b) Remove the 2 bolts and nuts holding the front exhaust pipe to the center exhaust pipe.
(c) Remove the 4 bolts and nuts holding the front exhaust pipe to the TWC.
(d) Remove the pipe support bracket, front exhaust pipe and 3 gaskets.
30. REMOVE TWC (FRONT) Using a 14 mm deep socket wrench, remove the 3 nuts, TWC
and gasket. Remove the 2 TWC.
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12. INSTALL CHARCOAL CANISTER
(a) Install the charcoal canister.
(b) Connect the vacuum hose and air hose to the charcoalcanister.
13. CONNECT HOSES Connect the following hoses and ground strap:
(1) Heater water hose to water bypass hose
(2) Heater water hose to heater water valve
(3) Brake booster hose to union on air intake chamber
(4) Vacuum hose (from VSV for heater water valve) to air in-
take chamber
(5) Ground strap to bracket on body
(6) Fuel inlet hose to fuel tube
SST 09278±54012
Torque: 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).
(7) Fuel return hose to return pipe
14. INSTALL AIR CONDITIONING (A/C) COMPRESSOR
(a) Install the A/C compressor, compressor stay and ground cable with the nut and 3 bolts.
Torque:
49 NVm (500 kgf Vcm, 36 ft Vlbf) for bolt
29 N Vm (300 kgf Vcm, 22 ft Vlbf) for nut
(b) Connect the A/C compressor connector.
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22. DISCONNECT PS RESERVOIR TANK AND BRACKET
FROM BODY
Remove the three bolts, and disconnect the reservoir tank
and bracket assembly.
23. DISCONNECT PS PUMP FROM ENGINE Remove the three pump bolts and nut, and disconnect the PS
pump.
HINT: Put aside the PS pump, and suspend it.
24. DISCONNECT A/C COMPRESSOR (a) Disconnect the compressor connector.
(b) Remove the mounting nut, and disconnect the groundcable.
(c) Remove the mounting bolt and compressor stay.
(d) Remove the two mounting bolts, and disconnect the compressor from the engine.
HINT: Put aside the compressor, and suspend it.
25. DISCONNECT HOSES AND GROUND STRAP Disconnect the following hose and ground strap:(1) Heater water hose from water by±pass pipe
(2) Heater water hose from heater water valve
(3) Vacuum hose from brake booster union on air in-
take chamber
(4) Vacuum hose (from VSV for heater water valve)
from air intake chamber
(5) Ground strap from bracket on body
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ENGINE MECHANICAL Cylinder BlockEM±123
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