Lexus SC300 / Lexus SC400. Manual - part 480

11.  RECONNECT DRIVER BELT

Install the drive belt by turning the drive belt tensioner clock-
wise.

12.  RECONNECT CABLE FROM NEGATIVE TERMINAL OF

BATTERY

13.  REFILL WITH ENGINE COOLANT

Knock Sensors

INSPECTION OF KNOCK SENSORS

1. 

DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Turn the ignition switch to ”LOCK”. Discon-
nect the cable from the negative (–) terminal of the bat-
tery. Wait at least 20 seconds before proceeding with
work.

–

EFI SYSTEM

Electronic Control System (Water Temperature Sensor)

FI–69

2. 

REMOVE KNOCK SENSOR
(a)  Disconnect the knock sensor connectors.
(b)  Using SST, remove the two knock sensors.
SST 09816–30010

3. 

INSPECT KNOCK SENSOR
Using an ohmmeter, check that there is no continuity be-
tween the terminal and body.
If there is continuity, replace the sensor.

4. 

REINSTALL KNOCK SENSOR
(a)  Using SST, remove the two knock sensors.
SST 09816–30010

Torque:     44 N

⋅

m (450 kgf

⋅

cm, 33 ft

⋅

lbf)

(b)  Connect the knock sensor connectors.

5.

RECONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY

FI–70

–

EFI SYSTEM

Electronic Control System (Knock Sensors)

EGR Gas Temperature Sensor (USA Spec. only)

INSPECTION OF EGR GAS
TEMPERATURE SENSOR

1. 

DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Turn the ignition switch to ”LOCK”. Discon-
nect the cable from the negative (–) terminal of the bat-
tery. Wait at least 20 seconds before proceeding with
work.

2. 

REMOVE EGR GAS TEMPERATURE SENSOR
(a) Disconnect the EGR gas  temperature sensor

connector.

(b)  Remove the EGR gas temperature sensor and gasket.

3. 

INSPECT EGR GAS TEMPERATURE SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.

Resistance:  69–89 k

 at 50

°

C (112

°

F)

             12–15 k

 at 100

°

C (212

°

F)

               2–4 k

 at 150

°

C (302

°

F)

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

–

EFI SYSTEM

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

FI–71

4. 

REINSTALL EGR GAS TEMPERATURE SENSOR
(a)  Install a gasket and the EGR gas temperature sensor.

Torque:     20 N

⋅

m (200 kgf

⋅

cm, 14 ft

⋅

lbf)

(b)  Connect the EGR gas temperature sensor connector.

5. 

RECONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY

FI–72

–

EFI SYSTEM

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