Lexus SC300 / Lexus SC400. Manual — part 712
INSPECTION OF COOLING FAN ECU
1.
DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Work must be started after 20 seconds or longer
from the time the ignition switch is turned to the ”LOCK” posi-
tion and the negative (–) terminal cable is disconnected from
the battery.
2.
DISCONNECT COOLING FAN ECU CONNECTOR
(See Components on page
(a) Remove the instrument panel under cover.
(b) Remove the lower instrument panel finish panel and
glove compartment door assembly.
(c) Disconnect the cooling fan ECU connector.
3.
INSPECT COOLING FAN ECU
(a) Connect the cable to the negative (–) terminal of the
battery.
(b) Check the connector on the wiring harness side as
shown in the chart.
Check for
Tester connection
Condition
Specified value
Voltage
1–Ground
Ignition switch ON
Battery voltage
Resistance
2–3
Solenoid valve at cold (20
°
C (68
°
F))
7.5–8.5
Continuity
4–Ground
–
Continuity
Continuity
5–Ground
Throttle valve open
No continuity
Continuity
5–Ground
Throttle valve closed
Continuity
Resistance
9–10
Coolant temp. at 80
°
C (176
°
F)
1.48–1.58 k
(c) Disconnect the cable from the negative (–) terminal of
the battery.
4.
RECONNECT COOLING FAN ECU CONNECTOR
5. RECONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
–
COOLIING SYSTEM
Electronically Controlled Hydraulic
Cooling Fan (Electronic Control Parts)
CO–61
(Water Temperature Sensor)
COMPONENTS FOR REMOVAL AND
INSTALLATION
INSPECTION OF WATER TEMPERATURE
SENSOR
1.
DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Work must be started after 20 seconds or
longer from the time the ignition switch is turned to the
”LOCK” position and the negative (–) terminal cable is
disconnected from the battery.
2.
REMOVE ENGINE UNDER COVER
3.
DRAIN ENGINE COOLANT (See page
4. REMOVE
WATER
TEMPERATURE
SENSOR
(a) Disconnect the water temperature sensor connector.
(b) Remove the water temperature sensor from left side of
the radiator lower tank.
(c) Remove the O–ring from the water temperature sensor.
CO–62
–
COOLIING SYSTEM
Electronically Controlled Hydraulic
Cooling Fan (Electronic Control Parts)
5. INSPECT
WATER
TEMPERATURE
SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance: 1.48–1.58 k
at 80
°
C (176
°
F)
If the resistance is not as specified, replace the sensor.
6. REINSTALL
WATER
TEMPERATURE
SENSOR
(a) Install a new O–ring to the water temperature sensor.
(b) Apply soapy water to the O–ring.
(c) Install the water temperature sensor to the radiator.
Torque: 7.4 N
⋅
m (75 kgf
⋅
cm, 65 in.
⋅
lbf)
(d) Connect the water temperature sensor connector.
7.
REFILL WITH ENGINE COOLANT (See page
8.
REINSTALL ENGINE UNDER COVER
9.
RECONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
(A/C High–Pressure Switch)
INSPECTION OF A/C HIGH–PRESSURE
SWITCH
1.
DISCONNECT HIGH–PRESSURE SWITCH CONNECTOR
2.
INSTALL MANIFOLD GAUGE SET (See AC section)
3.
INSPECT HIGH–PRESSURE SWITCH
(a) When the A/C switch is OFF, check that there is
continuity between terminals 2 and 3. (When the
pressure is 1,226 kPa (12.5 kgf/cm
2
, 178 psi) or lower.)
(b) When the A/C switch and blower switch are ON, check
that there is no continuity between terminals 2 and 3.
(When the pressure is 1,520 kPa (15.5 kgf/cm
2
, 220 psi)
or higher.)
If continuity is not as specified, replace the switch.
4.
REMOVE MANIFOLD GAUGE SET
5.
RECONNECT HIGH–PRESSURE SWITCH CONNECTOR
(Solenoid Valve)
(See page
–
COOLIING SYSTEM
Electronically Controlled Hydraulic
Cooling Fan (Electronic Control Parts)
CO–63
SERVICE SPECIFICATIONS
SERVICE DATA
Thermostat
Valve opening temperature
80–84
°
C
176–183
°
F
Valve lift
at 95
°
C (203
°
F)
10 mm
0.39 in.
Radiator cap
Relief valve opening pressure
STD
74–103 kPa
(0.75–1.05 kgf/cm, 10.7–14.9 psi)
Limit
59 kPa
0.6 kgf/cm
8.5 psi
On–vehicle
i
ti
f
h
Oil pressure
1,177–2,452 kPa
inspection for hy-
draulic cooling
(12–25 kgf/cm, 171–356 psi)
draulic cooling
fan
fan
Hydraulic pump
Spool valve
45.8 mm
1.803 in.
Rotor side clearance
STD
Drive rotor
0.02 mm
0.0008 in.
Driven rotor
0.03 mm
0.0012 in.
Limit
Drive rotor
0.03 mm
0.0012 in.
Driven rotor
0.04 mm
0.0016 in.
Rotor body clearance
STD
0.05–0.09 mm
0.0020–0.0035 in.
Limit
0.10 mm
0.0039 in.
Rotor tip clearance
STD
0.02 mm
0.0008 in.
Limit
0.03 mm
0.0012 in.
Drive shaft bushing inside diameter
17.00–17.05 mm
0.6693–0.6713 in.
Drive shaft diameter
16.97–16.98 mm
0.6681–0.6685 in.
Drive shaft oil clearance
STD
0.02–0.08 mm
0.0008–0.0031 in.
Limit
0.08 mm
0.0031 in.
Drive shaft preload (rotating torque)
0.3 N
⋅
m
3.0 kgf
⋅
cm
2.6 in.
⋅
lbf
Solenoid valve resistance
at cold
7.5–8.5
Hydraulic motor
Rotor side clearance
STD
0.01–0.04 mm
0.0004–0.0016 in.
Limit
0.05 mm
0.0020 mm
Drive shaft hole inside diameter
14.000–14.011 mm
0.5512–0.5516 in.
Drive shaft diameter
13.973–13.984 mm
0.5501–0.5506 in.
Drive shaft oil clearance
STD
0.016–0.038 mm
0.0006–0.0015 in.
Limit
0.04 mm
0.0031 in.
Drive shaft preload (rotating torque)
0.3 N
⋅
m
3.0 kgf
⋅
cm
2.6 in.
⋅
lbf
Water temp.
Resistance
at 80
°
C (176
°
F)
1.48–1.58 k
sensor
CO–64
–
COOLIING SYSTEM
Service Specifications
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