Lexus ES300 (1997 year). Service manual - part 531

S04530

Voltmeter

Disconnect

E2

VC

SF06R–01

B01078

Pressure

Vacuum

E2 (–)

PTNK (+)

SF–58

–

SFI

VAPOR PRESSURE SENSOR

909

1997 LEXUS ES300   (RM511U)

VAPOR PRESSURE SENSOR

INSPECTION

1.

INSPECT POWER SOURCE VOLTAGE OF 
VAPOR PRESSURE SENSOR

(a)

Disconnect the vapor pressure sensor connector.

(b)

Turn the ignition switch ON.

(c)

Using a voltmeter, measure the voltage between connec-
tor terminals VC and E2 of the wiring harness side.
Voltage: 4.5 – 5.5 V

(d)

Turn the ignition switch to LOCK.

(e)

Reconnect the vapor pressure sensor connector.

2.

INSPECT POWER OUTPUT OF VAPOR PRESSURE
SENSOR

(a)

Turn the ignition switch ON.

(b)

Disconnect the vacuum hose from the vapor pressure
sensor.

(c)

Connect a voltmeter to terminals  PTNK and E2 of the
ECM, and measure the output voltage under the following
conditions:

Apply vacuum (2.0 kPa, 15 mmHg, 0.59 in.Hg) to
the vapor pressure sensor.

Voltage: 1.3 – 2.1 V

Release the vacuum from the vapor pressure sen-
sor.

Voltage: 3.0 – 3.6 V

Apply pressure (1.5 kPa, 15 gf/cm

2

, 0.22 psi) to the

vapor pressure sensor.

Voltage: 4.2 – 4.8 V

(d)

Reconnect the vacuum hose to the vapor pressure sen-
sor.

S05372

PS Pressure Tube

VSV Connector for ASIC

Engine Coolant
Reservoir Hose

Fuel Inlet Pipe

Water Bypass Hose

No.2 EGR Pipe

Air Intake Chamber Stay

V–Bank Cover

 Gasket

Throttle Position
Sensor Connector

 Gasket

Accelerator Cable

Brake Booster
Vacuum Hose

EGR Valve Position
Sensor Connector

Throttle Cable

IAC Valve
Connector

Air Cleaner
Hose

VSV Connector
for EGR

Engine Wire

No.1 Engine
Hanger

VSV Connector for
EVAP

Ground Cable

Ground Cable

Ground Strap

DLC1

PCV Hose

Air Intake Chamber
Assembly

 Gasket

Knock Sensor

High–Tension Cord

EGR Gas Temperature

Sensor Connector

EVAP Hose

Water Bypass Hose

Air Assist Hose

Vacuum
Hose

Heater Hose

Intake Manifold Assembly

Injector Connector

N·m (kgf·cm, ft·lbf)

Set

Connector

 Gasket

ECT Sender
Gauge Connector

ECT Sensor
Connector

Ground Strap
Connector

Water Outlet

 Gasket

Knock Sensor

: Specified torque

 Non–reusable part

Upper Radiator
Hose

Engine

Wire Band

39 (400, 29)

19.50(200, 14)

39 (400, 19)

12 (120, 9)

43 (440, 32)

15 (150, 11)

15 (150, 11)

SF06S–04

–

SFI

KNOCK SENSOR

SF–59

910

1997 LEXUS ES300   (RM511U)

KNOCK SENSOR

COMPONENTS

SF06T–01

P20115

SST

Knock Sensor 1

Knock Sensor 2

P01630

Ohmmeter

SF–60

–

SFI

KNOCK SENSOR

911

1997 LEXUS ES300   (RM511U)

INSPECTION

1.

REMOVE AIR CLEANER HOSE

2.

REMOVE RH ENGINE MOUNTING STAY

3.

REMOVE INTAKE MANIFOLD ASSEMBLY AND
WATER OUTLET (See page 

EM–30

)

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–52

)

8.

REINSTALL RH ENGINE MOUNTING STAY

9.

REINSTALL AIR CLEANER HOSE

S05661

 Gasket

Throttle Body

Throttle Position
Sensor Connector

IAC Valve Connector

Water Bypass Hose

Air Assist Hose

Water Bypass Hose

EGR Gas Temperature
Sensor Connector

Air Cleaner Hose

EGR Gas Temperature
Sensor Bracket

EGR Gas Temperature Sensor

Accelerator Cable

Throttle Cable

N·m (kgf·cm, ft·lbf)

: Specified torque

 Non–reusable part

19.5 (200, 14)

SF06U–02

–

SFI

EXHAUST GAS RECIRCULATION (EGR) GAS 
TEMPERATURE SENSOR

SF–61

912

1997 LEXUS ES300   (RM511U)

EXHAUST GAS RECIRCULATION (EGR) GAS
TEMPERATURE SENSOR

COMPONENTS