water pump LEXUS SC300 1991 Service Repair Manual

22. REMOVE FUEL RETURN PIPE(a) Remove the bolt holding the return pipe to the LHcylinder head.
(b) Remove the union bolt, two gaskets and return pipe.
23. REMOVE DELIVERY PIPES AND INTAKE MANIFOLD ASSEMBLY
(a) Remove the six bolts and four nuts holding the intakemanifold to the cylinder heads.
(b) Remove the two delivery pipe and intake manifold assembly.
(c) Remove the two intake manifold gaskets.
24. DISCONNECT HEATER WATER HOSES FROM WATER BY±PASS PIPE AND REAR WATER BY±PASS JOINT
25. REMOVE WATER BY±PASS PIPE (a) Remove the two mounting bolts.
(b) Pull out the water by±pass pipe from the water pump.
(c) Remove the O±ring from the water by±pass pipe.
26. REMOVE REAR WATER BY±PASS JOINT Remove the four nuts, water by±pass joint and two gaskets.
±
STARTING SYSTEM StarterST±13
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INSTALLATION OF STARTER
(See Components on page ST±5)
1. INSTALL STARTER (a) Connect the wire clamp to the wire bracket.
(b) Connect the starter wire with the nut.
(c) Connect the starter connector.
(d) Install the starter with the two bolts.
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
2. INSTALL REAR WATER BY±PASS JOINT
(a) Install four new gaskets and the water by±pass joint with
the four nuts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
(b) Install the bolt holding the water by±pass pipe to the LH
engine hanger.
3. INSTALL WATER BY±PASS PIPE (a) Install a new O±ring to the water by±pass pipe.
(b) Apply soapy water to the O±ring.
(c) Push in the water by±pass pipe end into the pipe holeof the water pump.
(d) Install the water by±pass pipe with the two bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
4. CONNECT HEATER WATER HOSES TO WATER
BY±PASS PIPE AND REAR WATER BY±PASS JOINT
±
STARTING SYSTEM StarterST±25
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27
Position of Parts in Engine Compartment
I 1 ISC Valve S 3Speed Sensor No. 1
I 2 Igniter S 4 Speed Sensor No. 2 (for ECT)
I 4 Ignition Coil S 6 Starter
I 6 Injector No. 1 S 7 Starter
I 7 Injector No. 2 S 8 Sub Throttle Actuator
I 8 Injector No. 3 S 9 Sub Throttle Position Sensor
I 9 Injector No. 4
I 10 Injector No. 5 T 1 Theft Deterrent Horn
I 11 Injector No. 6 T 2 Throttle Position Sensor T 3 Traction Brake Actuator
K 1 Knock Sensor No. 1 (on Front Side) T 4 Traction Brake Actuator
K 2 Knock Sensor No. 2 (on Rear Side) T 5 Traction pump and Motor
N 1 Neutral Start SW, Back±Up Light SW and A/T Indicator SW V 1 VSV (for EGR) (Exc. USA Spec) (for A/T) V 2 VSV (for EVAP)
N 2 Noise Filter (for Defogger System) V 4 VSV (for Water Valve)
N 3 Noise Filter (for Ignition System) V 7 VSV (for Intake Control Valve)
O 2 Oil Pressure SW W 1 Washer Level SW
O 3 Oxygen Sensor Main No. 1 (on Front Side) W 2 Washer Motor
O 4 Oxygen Sensor Main No. 2 (on Rear Side) W 3 Water Temp. Sender W 5 Wiper Motor
P 1 PPS Solenoid
P 20 Power Steering Pressure SW
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71
*1 :W/TRACTIONCONTROL
* 2 : W/O TRACTION CONTROL
BK
I22 B12
5
1
2
34
M
21
A
21 DI
A
22 FPC B
46
THG B
44
THW
2 1
2
1
BT1
2BT1 1
FPC DI E FP +B
B
L±Y
B±R
B±R
B±R
BR BR
G
L±Y
B±R
W±B G
B±R P
R±G P
R±G P
R±G
G
W±B
G
W±B W±B
B±RG EGR GAS TEMP. SENSOR
(
FOR CALIFORNIA )
EFI WATER TEMP. SENSOR
ENGINE ECU (
M/T )
FUEL PUMP ECU
FUEL PUMP
F15 F16 E11
,E1 2
E3
E4
A
B
IJ1
8IJ1 14
2 1
1 2 1 1H
41K 10
44
4IJ111
11 EC ED
E18 E20
I32I33
B
49
B
50 B 26 B27
B
7
B
25 B 80 B79
A
15
B
75 B 74 B 39 R±Y R±Y
B±R
BR
W±B
W±B BR
W
W
RY
B
L G
L±R
G±R
G±B
B±W B±R
B±RB±RB±R
B±R
2
( *2 )
(*2 )
(*1 )
( *1 )
VSV
(
FOR EGR )
VSV (
FOR EVAP )
VSV
( FOR INTAKE
CONTROL VALVE )
V1
V2
V3
10A
MIR
HTR
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
(
FOR USA SPEC. )(
FOR USA SPEC.)
(
SHIELDED )
( SHIELDED )
KNOCK SENSOR NO. 2
( ON REAR SIDE )
KNOCK SENSOR NO. 1
(
ON FRONT SIDE )
K1
K2
(SHIELDED )
2341
KNK1 KNK2 G1 G2 G± NE
G1 G2 G± NE
B
EO1 EO2
DISTRIBUTOR
D13
EGR EVAP ACIS
ELS
15A
TAIL
ENGINE AND ECT ECU (
A/T )
E9 , E10
AB 2
13
B±R
B±R
DIODE
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