1991 LEXUS SC400 VSV

(b) Remove the 2 bolts, the vacuum pipe and hoses assembly.
12. California:REMOVE EGR VALVE
(a) Disconnect the EGR valve connector.
(b) Disconnect the following hoses:
(1) Water bypass hose from IAC valve
(2) Water bypass hose from water bypass pipe (from rearwater by5pass joint)
(c) Remove the 2 nuts, EGR valve and gasket.
13. Except California: REMOVE EGR VALVE AND VACUUM MODULATOR
(a) Disconnect the following hoses:
(1) Water bypass hose from IAC valve
(2) Water bypass hose from water bypass pipe (from rearwater bypass joint)
(3) 2 vacuum hoses from VSV for EGR
(b) Disconnect the hose clamp from the PCV hose.
EG±78
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1UZ±FE ENGINE ENGINE MECHANICAL
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16. REMOVE HEATER WATER VALVE FROM BODY
(a) Disconnect the VSV connector.
(b) Disconnect the bolt holding the engine wire clamp to thewater valve bracket.
(c) Remove the 2 bolts, and disconnect the water valve and bracket assembly.
17. REMOVE THROTTLE BODY
(a) Disconnect the following connectors: (1) Throttle position sensor connector
(2) w/ TRAC:
Sub±throttle position sensor connector
(3) w/ TRAC: Sub±throttle actuator connector
(b) Remove the 2 bolts and 2 nuts, and disconnect the throttle body from the air intake chamber.
(c) Disconnect the following hoses, and remove the throttle body:
(1) PCV hose from throttle body
(2) Water bypass hose from throttle body
(d) Remove the throttle body gasket.
18. REMOVE AIR INTAKE CHAMBER
(a) Disconnect the following hoses: (1) Brake booster vacuum hose from union on air intake
chamber
(2) Vacuum hose (from VSV for heater water valve) from air
intake chamber
EG±80
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1UZ±FE ENGINE ENGINE MECHANICAL
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(b) Remove the bolt, stud bolt and accelerator bracket.
(c) Remove the union bolt, union and 2 gaskets.
(d) Disconnect the following connectors:wCold start injector connector
w VSV connector for fuel pressure control
w Except California:
VSV connector for EGR
(e) Remove the union bolt and 2 gaskets, and disconnect the cold start injector tube from the RH delivery pipe.
CAUTION:
w Put a shop towel under the delivery pipe.
w Slowly loosen the union bolt.
(f) Remove the 2 bolts and gasket, and disconnect the EGR
pipe from the air intake chamber.
(g) Remove the 4 bolts, 8 nut and following parts: (1) VSV for fuel pressure
(2) Except California:VSV for EGR
(3) Transmission throttle cable bracket
(h) Disconnect the DLC1 from the air intake chamber.
(i) Remove the air intake chamber and 4 gaskets.
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(d) Install a new gasket to the EGR pipe.
(e) Temporarily connect the EGR pipe to the air intake chamberwith the 2 bolts.
HINT: Use bolt 20 mm (0.79 in.) in length.
(f) Temporarily install the air intake and and following parts with the 4 bolts and 8 nuts:
(1) VSV for fuel pressure control
(2) Except California:VSV for EGR
(3) Transmission throttle cable bracket
(4) DLC1
(g) Uniformly tighten the bolts and nuts several passes.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolt 40 mm (1.57 in.) in length.
(h) Tighten the 2 bolts holding the EGR pipe to the air intake chamber.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
(i) Tighten the bolt holding the EGR pipe to the RH cylinder
head.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
(j) Connect the cold start injector tube to the RH delivery pipe
with 2 new gaskets and the union bolt.
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
(k) Connect the following connectors:
wCold start injector connector
w VSV connector for fuel pressure control
w Except California:
VSV connector for EGR
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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.
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(c) Connect the following hoses:(1) Water bypass hose to IAC valve
(2) Water bypass hose to water bypass pipe(from rear water bypass joint)
(3) 2 vacuum hoses to VSV for EGR
(d) Install the hose clamp to the PCV hose.
35. INSTALL VACUUM PIPE
(a) Install the vacuum pipe, vacuum hose assembly and EGR water bypass pipe (California) with the 2 bolts.
(b) Connect the following hoses: (1) California: Vacuum hose to throttle body
(2) Except California: 3 vacuum hoses to throttle body
(3) Vacuum hose to fuel pressure regulator
(4) 2 vacuum hoses to VSV for fuel pressure control
(5) Except California: 2 vacuum hoses to EGR vacuum modulator
(6) 2 vacuum hoses (from VSV for EVAP) to vacuum pipe
(7) Vacuum hose (from VSV for fuel pressure) to air intake chamber
(8) Vacuum hose (from charcoal canister) to vacuum pipe
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15. DISCONNECT ENGINE WIRE CONNECTORS
16. DISCONNECT THEFT DETERRENT HORN CONNECTOR
17. DISCONNECT GROUND CABLE FROM BODY
18. DIS CO NNE CT PO WE R STE E RING (P S ) SO LE NO IDVALVE CONNECTOR
19. DISCONNECT WIRE CLAMP (FOR GENERATOR) FROM VSV (FOR EVAP)
(a) Remove the 2 bolts, and disconnect the VSV from the RH
cylinder head.
(b) Disconnect the wire clamp from the VSV bracket.
20. REMOVE GENERATOR
(a) Disconnect the generator connector.
(b) Remove the cap and nut, and disconnect the generator wire.
(c) Remove the bolt, and disconnect the transmission oil cooler pipe bracket from the generator.
(d) Remove the nut and generator.
21. DISCONNECT POWER STEERING (PS) TUBES FROM SUSPENSION CROSSMEMBER
Remove the clamp bolt, and disconnect the PS tubes.
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1UZ±FE ENGINE ENGINE MECHANICALEG±143
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