1991 LEXUS SC400 sensor

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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1UZ±FE ENGINE ENGINE MECHANICAL
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12. REMOVE RADIATOR RESERVOIR TANK
(a) Disconnect the coolant level sensor connector.
(b) Disconnect the following hoses:(1) Reservoir hose from water inlet housing
(2) Reservoir hose from radiator
(c) Remove the 2 bolts and reservoir tank bracket.
(d) Remove the bolt holding the reservoir tank to the radiator.
(e) Disconnect the reservoir tank from the reservoir tank bracket,
and remove the reservoir tank.
13. REMOVE RADIATOR ASSEMBLY
(a) Disconnect the ECT sensor connector (for cooling fan).
(b) Disconnect the ECT sensor wire clamp from the radiator fan shroud.
(c) Disconnect the following hoses: (1) 2 oil cooler hoses (for cooling fan) from pipes
(2) 2 radiator hoses
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1UZ±FE ENGINE ENGINE MECHANICALEG±141
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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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1UZ±FE ENGINE ENGINE MECHANICALEG±147
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3. DISCONNECT ENGINE WIRE
(a) Disconnect the following connector:(1) O/D direct clutch speed sensor connector
(2) No.1 VSS connector for Speedometer
(3) No.2 VSS connector for ECM
(4) PNP switch connector
(5) Solenoid connector
(b) D i s c onnect the 5 wire clamps from the brackets on
transmission.
4. REMOVE TRANSMISSION (See page AT±23)
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1UZ±FE ENGINE ENGINE MECHANICALEG±151
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(b) Disconnect the engine wire clamp from the bracket on thestarter.
(c) Remove the nut, and disconnect the starter wire.
(d) Disconnect the starter connector, and remove the starter.
8. REMOVE KNOCK SENSORS
(a) Disconnect the 2 knock sensor connectors.
(b) Using SST, remove the 2 knock sensors.
SST 09816±30010
9. REMOVE WATER BYPASS PIPE
(a) Remove the 2 bolts.
(b) Pull out the water bypass pipe from the water pump.
(c) Remove the O±ring from the water bypass pipe.
10. REMOVE ENGINE WIRE
(a) Disconnect the following connector: wCrankshaft position sensor connector
w Oil pressure switch connector
w Oil level sensor connector
(b) Remove the 3 bolts and engine wire cover from the LH side of the cylinder block.
(c) Remove the 2 bolts and engine wire.
EG±154
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1UZ±FE ENGINE ENGINE MECHANICAL
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(b) Install the engine wire cover with the 3 bolts.
(c) Connect the following connector:wCrankshaft position sensor connector
w Oil pressure switch connector
w Oil level sensor connector
7. INSTALL WATER BYPASS PIPE
(a) Install a new O±ring to the water bypass pipe.
(b) Apply soapy water to the O±ring.
(c) Push the water bypass pipe end into the pipe hole of the water pump.
(d) Install the water bypass pipe with the 2 bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
8. INSTALL KNOCK SENSORS
(a) Using SST, install the 2 knock sensors.
SST 09816±30010
Torque: 44 N Vm (450 kgf Vcm, 33 ft Vlbf)
(b) Connect the 2 knock sensor connectors.
9. INSTALL STARTER
(a) Install the engine wire clamp to the bracket on the starter.
(b) Connect the starter wire with the nut.
(c) Connect the starter connector.
(d) Install the starter with the 2 bolts.
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
EG±188±
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ENGINE & TRANSMISSION ASSEMBLY
EG34U±01
(See Components for Engine & Transmission Separation and
Assembly)
1. INSTALL TRANSMISSION TO ENGINE
(See page AT±23)
2. CONNECT ENGINE WIRE
(a) Connect the following parts: (1) O/D direct clutch speed sensor connector
(2) No.1 VSS connector for speedometer
(3) No.2 VSS connector for ECM
(4) PNP switch connector
(5) Solenoid connector
(b) Install the 5 wire clamps to the brackets on the transmission.
EG±190
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1UZ±FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

7. INSTALL TAILPIPE
(a) Install the hook of the tailpipe to the ring on the tailpipebracket.
(b) Install a new gasket and tailpipe to the center exhaust pipe with 2 bolts. Install the 2 tailpipes.
Torque: 19 N Vm (195 kgf Vcm, 14 ft Vlbf)
8. INSTALL TWC (FRONT)
Using a 14 mm deep socket wrench, install a new gasket and
the TWC with 3 new nuts. Install the 2 TWC.
Torque: 62 N Vm (630 kgf Vcm, 46 ft Vlbf)
9. INSTALL FRONT EXHAUST PIPE
(a) Temporarily install the pipe support bracket with the 4 bolts.
(b) Temporarily install 3 new gaskets and the exhaust pipe with
the 6 bolts and nuts.
(c) Tighten the 4 bolts and nuts holding the TWC to the front exhaust pipe.
Torque: 43 N Vm (440 kgf Vcm, 32 ft Vlbf)
(d) Tighten the 2 bolts and nuts holding the front exhaust pipe to
the center exhaust pipe.
Torque: 43 N Vm (440 kgf Vcm, 32 ft Vlbf)
(e) Tighten the 4 bolts holding the pipe support bracket to the
transmission.
Torque: 43 N Vm (440 kgf Vcm, 32 ft Vlbf)
10. INSTALL SUB HEATED OXYGEN SENSORS
Install the 2 oxygen sensors to the front exhaust pipe.
Torque: 44 N Vm (450 kgf Vcm, 33 ft Vlbf)
HINT:
w Before installing the oxygen sensor, twist the sensor
wire counterclockwise 3 1/2 turns.
w After installing the oxygen sensor, check that the sensor
wire is not twisted. If it is twisted, remove the oxygen
sensor and reinstall it.
EG±194
±
1UZ±FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName