Lexus SC300 / Lexus SC400. Manual — part 703

2.

INSPECT OIL PRESSURE
HINT: Before inspecting the oil pressure, first check that the
A/C is off.
(a) Using SST, connect terminals OP1 and E1 of the check

(”DIAGNOSIS”) connector.

SST 09843–18020
HINT: When terminals OP1 and E1 are connected, the circuit
of the water temp. sensor is grounded, fixing the fan speed
at approx. 1,100 rpm. (Fail–safe operation occurs.)
(b) Bleed the hydraulic cooling system
(See page

CO–24

)

(c) Keep the engine speed at 2,000 rpm until the fluid

temperature reaches the specified temperature.

Fluid temp.: 70–90

°

C (158–195

°

F)

(d) Check the fluid level is correct.

(e) Measure the oil pressure at idling.

Oil pressure: 1,177–2,452 kPa

(12–25 kgf/cm, 171–356 psi)

(f) Remove the SST from the check connector.
SST 09843–18020

(g) Check that the oil pressure decreases.

3. REMOVE PRESSURE GAUGE, AND CONNECT

PRESSURE HOSE

Torque: 64 N

⋅

m (650 kgf

⋅

cm, 47 ft

⋅

lbf)

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (On–Vehicle Inspection)

CO–25

Hydraulic Pump

COMPONENTS FOR REMOVAL AND
INSTALLATION

CO–26

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

REMOVAL OF HYDRAULIC PUMP

(See Components on page

CO–26

)

1. REMOVE

BATTERY

CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ”LOCK” position and the negative (–) termi-
nal cable is disconnected from the battery.

2.

REMOVE ENGINE UNDER COVER

3.

DRAIN ENGINE COOLANT (See page

CO–6

)

4.

REMOVE DRIVE BELT
Loosen the drive belt tension by turning the drive belt tension-
er counterclockwise, and remove the drive belt.
HINT: The pulley bolt for the belt tensioner has a left–hand
thread.

5.

DISCONNECT A/C COMPRESSOR
(a) Disconnect the A/C compressor connector.
(b) Remove the nut, and disconnect the ground cable.
(c) Remove the bolt and A/C compressor stay.

(d) Remove the two bolts, and disconnect the A/C

compressor from the engine.

6.

REMOVE LH IGNITION COIL
(a) Disconnect the following connectors and cord:

(1) Ignition coil connector
(2) Noise filter connector
(3) High–tension cord

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

CO–27

(b) Remove the two bolts and ignition coil.

7.

REMOVE INTAKE AIR CONNECTOR
(a) Disconnect the following hoses:

(1) Air hose from ISC valve
(2) Air hose (from PS air control valve) from intake air

connector

(b) Remove the bolt holding the intake air connector to the

cylinder head cover.

(c) Loosen the two hose clamps.
(d) Disconnect the intake air connector from the throttle

body and air cleaner hose, and remove the throttle body.

8.

REMOVE UPPER HIGH–TENSION CORD COVER
(a) Remove the two mounting bolts.
(b) Disconnect the front side claw groove of the cord cover

from the claw of the lower cover, and remove the cord
cover.

9.

REMOVE RH ENGINE WIRE COVER
Remove the bolt and engine wire cover.

CO–28

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)