sensor LEXUS SC300 1991 Service Repair Manual

(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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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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(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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(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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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
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(f) Connect the ECT sensor connector (for cooling fan).
(g) Install the ECT sensor wire clamp to the radiator fan shroud.
26. INSTALL RADIATOR RESERVOIR TANK
(a) Install the reservoir tank to the reservoir tank bracket.
(b) Install the reservoir tank with the bracket and 3 bolts.
Torque: 4.9 N.m (50 kgfVcm, 43 in. Vlbf)
(c) Connect the following hoses:
(1) Reservoir hose to water inlet housing
(2) Reservoir hose to radiator
(d) Connect the coolant level sensor connector.
27. INSTALL INTAKE AIR CONNECTOR
(a) Connect the intake air connector to the throttle body.
(b) Install the hose clamp and bolt.
(c) Connect the following hoses to the intake air connector: (1) Air hose (from IAC valve)
(2) Air hose (from air control valve on PS pump)
28. CONNECT VACUUM HOSE (A) (FROM PS AIR CONTROL VALVE) TO AIR INTAKE CHAMBER
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12. REMOVE RADIATOR RESERVOIR TANK(a) Disconnect the coolant level sensor connector.
(b) Disconnect the following hoses:(1) Reservoir hose to water inlet housing
(2) Reservoir hose to radiator
(c) Remove the two bolts and reservoir tank bracket.
(d) Disconnect the reservoir tank from the reservoir tank bracket, and remove the reservoir tank.
13. REMOVE RADIATOR (a) Disconnect the water temperature sensor connector.
(b) Disc onnect the wire clamp (for water temperature
sensor) from the radiator fan shrould.
(c) Disconnect the following hoses: (1) Two oil cooler hoses (for cooling fan) from pipes
(2) Two radiator hoses
EM±120
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(i) Remove the bolt holding the engine wire clamp to theheater water valve bracket.
(j) Remove the two bolts holding the engine wire clamp to the body.
(k) Pull out the engine wire from the cabin.
28. REMOVE FRONT EXHAUST PIPE (a) Disconnect the grommet from the floor, and disconnectthe sub±oxygen sensor from the exhaust pipe.
Disconnect the two sub±oxygen sensors.
(b) Remove the four bolts holding the front exhaust pipe to the transmission.
(c) Remove the two bolts and nuts holding the front exhaust
pipe to the center exhaust pipe.
(d) Re mo ve th e fo u r bo lts an d nu ts ho ld in g th e fro n t
exhaust pipe to the catalytic converter. Remove the pipe
support stay, front exhaust pipe and three gaskets.
29. REMOVE CATALYTIC CONVERTERS (MAIN) Remove the three nuts, catalytic converter and gasket. Re-
move the two catalytic converters.
EM±126
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3. DISCONNECT ENGINE WIRE FROM TRANSMISSION(a) Disconnect the following connectors:(1) O/D direct clutch speed sensor connector
(2) No.1 speed sensor connector
(3) No.2 speed sensor connector
(4) Neutral start switch connector
(b) Disconnect the five wire clamps from the brackets on the
transmission.
4. SEPARATE ENGINE AND TRANSMISSION (See AT section)
EM±130
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