Lexus RX300 (MCU15). Service manual - part 423

FI0VY–01

S04759

ECT Switch

Gasket

19 mm
Deep Socket
Wrench

S04982

Ohmmeter

Acceptable

RESIST

ANCE

 k

Ω

TEMPERATURE °C (°F)

–

ELECTRONIC FUEL INJECTION

WATER TEMPERATURE SENSOR

FI–63

LEXUS RX300   (RM785E)

WATER TEMPERATURE SENSOR

INSPECTION

1.

DRAIN ENGINE COOLANT

2.

REMOVE WATER TEMPERATURE SENSOR

(a)

Disconnect the water temperature sensor connector.

(b)

Using a 19 mm deep socket wrench, remove the water
temperature sensor and  gasket.

3.

INSPECT WATER TEMPERATURE SENSOR

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

Resistance: Refer to the graph

If the resistance is not as specified, replace the water tempera-
ture sensor.
4.

REINSTALL WATER TEMPERATURE SENSOR

(a)

Install a new gasket to the water temperature sensor.

(b)

Using a 19 mm deep socket, install the water temperature
sensor.
Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)

(c)

Connect the water temperature sensor connector.

5.

REFILL WITH ENGINE COOLANT

FI0VZ–01

B13138

N·m (kgf·cm, ft·lbf)

: Specified torque

LH Wiper Arm and Blade Assembly

Hood to Cowl Top Seal

Wiper Motor with Wiper Link

Outer Cowl Top Panel

x 6

Wiper Motor Connector

24 (245, 18)

RH Cowl Top
Ventilator Louver

LH Cowl Top Ventilator Louver

RH Wiper Arm and Blade Assembly

FI–64

–

ELECTRONIC FUEL INJECTION

KNOCK SENSOR

LEXUS RX300   (RM785E)

KNOCK SENSOR

COMPONENTS

B12954

19.5 (200, 14)

39 (400, 19)

PS Pressure
Tube

Brake Booster
Vacuum Hose

No. 1 Engine
Hanger

VSV Connector 
for EVAP

Ground Cable

43 (440, 32)

Ground Cable

Ground Strap

PCV Hose

Air Intake Chamber
Assembly
z

 Gasket

No. 1 VSV Connector for ASIC

Water Temperature 
Sensor Connector

Ground Strap
Connector

15 (150, 11)

z

 Gasket

Water Outlet

z

 Gasket

Upper Radiator
Hose

15 (150, 11)

Water Bypass
Hose

x 9

N·m (kgf·cm, ft·lbf) : Specified torque

Air Intake Chamber Stay

Throttle Position
Sensor Connector

IAC Valve
Connector

V–Bank Cover Fastener

V–Vank Cover

Accelerator Cable

Cruise Control Cable

Water Bypass Hose

Vacuum Hose

Purge Hose

Fuel Hose Clamp

Heater Hose

Intake Manifold 
Assembly

Injector Connector

z

 Non–reusable part

Knock Sensor
Connector

Knock Sensor

39 (400, 29)

–

ELECTRONIC FUEL INJECTION

KNOCK SENSOR

FI–65

LEXUS RX300   (RM785E)

FI0W0–01

P20115

SST

Knock Sensor 1

Knock Sensor 2

P01630

Ohmmeter

FI–66

–

ELECTRONIC FUEL INJECTION

KNOCK SENSOR

LEXUS RX300   (RM785E)

INSPECTION

1.

REMOVE AIR CLEANER HOSE

2.

REMOVE RH ENGINE MOUNTING STAY

3.

REMOVE INTAKE MANIFOLD ASSEMBLY AND
WATER OUTLET (See page EM–33)

4.

REMOVE KNOCK SENSORS

(a)

Disconnect the knock sensor connector.

(b)

Using SST, remove the knock sensor.
SST

09817–16011

5.

INSPECT KNOCK SENSORS

Using an ohmmeter, check that there is no continuity between
the terminal and body.
If there is continuity, replace the sensor.
6.

REINSTALL KNOCK SENSORS

(a)

Using SST, install the knock sensor.
SST

09817–16011

Torque: 39 N·m (400 kgf·cm, 29 ft·lbf)

(b)

Connect the knock sensor connector.

7.

REINSTALL WATER OUTLET AND INTAKE 
MANIFOLD ASSEMBLY (See page EM–60)

8.

REINSTALL RH ENGINE MOUNTING STAY

9.

REINSTALL AIR CLEANER HOSE