Lexus SC300 / Lexus SC400. Manual - part 489

6. INSPECT 

WATER 

TEMPERATURE 

SENSOR

Using an ohmmeter, measure the resistance between the ter-
minals.

Resistance: Refer to the chart graph

If the resistance is not as specified, replace the sensor.

7. REINSTALL 

WATER 

TEMPERATURE 

SENSOR

(a)  Install a new gasket to the water temperature sensor.
(b)  Install the water temperature sensor.

Torque: 20 N

⋅

m (200 kgf

⋅

cm, 14 ft

⋅

lbf)

(c)  Connect the water temperature sensor connector.

8. 

REINSTALL WATER INLET AND INLET HOUSING
(a)  Remove any old packing (FIPG) material and be careful

not to drop any oil on the contact surfaces of the water
inlet housing and water pump.

•

Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket
surfaces and sealing groove.

•

Thoroughly clean all components to remove all the
loose material.

•

Using a non–residue solvent, clean both sealing
surfaces.

(b)  Apply seal packing to the sealing groove of the water

inlet housing as shown in the illustration.

Seal packing: Part No. 08826–00100 or equivalent

•

Install a nozzle that has been cut to a 2–3 mm
(0.08–0.12 in.) opening.

HINT: Avoid applying an excessive amount to the surface.

•

Parts must be assembled within 5 minutes of
application. Otherwise the material must be
removed and reapplied.

•

Immediately remove nozzle from the tube and
reinstall cap.

(c)  Install a new O–ring to the water inlet housing.
(d)  Apply soapy water to the O–ring.

FI–100

EFI SYSTEM   –   Electronic Control System (Water Temperature Sensor)

(e)  Push in the water inlet housing end into the water pump

hole.

(f)  Install the water inlet and inlet housing assembly with

the two bolts. Alternately tighten the bolts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(g)  Connect the water by–pass hose to the water inlet

housing.

9. RECONNECT 

HOSES

Connect the following hoses:

(1)  Upper radiator hose to front water by–pass joint
(2)  Lower radiator hose to water inlet
(3)  Radiator reservoir hose to front water inlet housing

10. REINSTALL 

RH 

IGNITION 

COIL

(a)  Install the ignition coil with the two bolts.

(b)  Install the cam position sensor connector to the ignition

coil bracket.

(c)  Connect the ignition coil connector.

11.  REINSTALL LOWER HIGH–TENSION CORD COVER

(See steps 1 to 13 and 16 to 18 on pages 

FI–39

 to 41)

FI–101

EFI SYSTEM   –   Electronic Control System (Water Temperature Sensor)

EGR Gas Temperature Sensor (USA Spec. only)

COMPONENTS FOR REMOVAL AND INSTALLATION

FI–102

                             –   Electronic Control System (EGR Gas Temperature Sensor (USA Spec. only))

EFI SYSTEM

INSPECTION OF EGR GAS
TEMPERATURE SENSOR

1. 

DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
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. 

DRAIN ENGINE COOLANT

3. 

REMOVE EGR VALVE
(a)  Disconnect the EGR gas temperature sensor.
(b)  Disconnect the following hoses from the EGR valve:

(1)  Water by–pass hose (from ISC valve)
(2)  Water by–pass hose (from rear water by–pass

joint)

(c)  Remove the two nuts, EGR valve and gasket.

4. 

REMOVE EGR VALVE ADAPTOR
(a)  Disconnect the EGR gas temperature sensor.
(b)  Disconnect the PCV hose from the EGR valve adaptor.

(c)  Remove the two bolts, two nuts, EGR valve adaptor and

gasket.

FI–103

EFI SYSTEM   –   Electronic Control System (EGR Gas Temperature Sensor (USA Spec. only))