Lexus ES300 (1997 year). Manual — part 453

S05053

PCV Valve

EC01K–01

P02006

Clean Hose

Cylinder Head Side

P02477

Intake Manifold
Side

P12931

EC–4

–

EMISSION CONTROL

POSITIVE CRANKCASE VENTILATION (PCV)
SYSTEM

845

1997 LEXUS ES300 (RM511U)

POSITIVE CRANKCASE
VENTILATION (PCV) SYSTEM

INSPECTION

1.

REMOVE PCV VALVE

(a)

Disconnect the PCV hose from the PCV valve.

(b)

Remove the PCV valve.

2.

INSTALL CLEAN HOSE TO PCV VALVE

3.

INSPECT PCV VALVE OPERATION

(a)

Blow air into the cylinder head side, and check that air
passes through easily.

CAUTION:
Do not suck air through the valve.
Petroleum substances inside the valve are harmful.

(b)

Blow air into the intake manifold side, and check that air
passes through with difficulty.

If operation is not as specified, replace the PCV valve.
4.

REMOVE CLEAN HOSE FROM PCV VALVE

5.

REINSTALL PCV VALVE

6.

VISUALLY INSPECT HOSES, CONNECTIONS AND
GASKETS

Check for cracks, leaks or damage.

P25178

EC01L–01

EC3069

Gasket

Check Valve

S05162

S05363

Port E

Port D

Port A

Port B

Compressed
Air

S05360

Port C

Port D

Port A

Port B

Compressed
Air

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–5

846

1997 LEXUS ES300 (RM511U)

EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM

INSPECTION

1.

VISUALLY INSPECT LINES AND CONNECTIONS

Look for loose connections, sharp bends or damage.
2.

VISUALLY INSPECT FUEL TANK

Look for deformation, cracks or fuel leakage.

3.

VISUALLY INSPECT FUEL TANK CAP

Check if the cap and/or gasket are deformed or damaged.
If necessary, repair or replace the cap.

4.

REMOVE CHARCOAL CANISTER

5.

VISUALLY INSPECT CHARCOAL CANISTER

Look for cracks or damage.

6.

CHECK FOR CLOGGED FILTER, AND STUCK
CHECK VALVE AND DIAPHRAGM

(a)

Install the plug to port E.

(b)

While holding port B closed, blow air (1.76 kPa, 18 gf/cm

2

,

0.26 psi) into port A and check that air flows from port D.

(c)

While holding port B and port D closed, blow air (1.76 kPa,
18 gf/cm

2

, 0.26 psi) into port A and check that air does not

flow from port C.

S05361

Port C

Port B

S05362

Port C

Port B

Port A

EC–6

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

847

1997 LEXUS ES300 (RM511U)

(d)

Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to port
B, check that the vacuum does not decrease when port
C is closed, and check that the vacuum decreases when
port C is released.

(e)

While holding port C closed, apply vacuum (3.43 kPa,
25.7 mmHg, 1.01 in.Hg) to port A and check that air flows
into port B.

If a problem is found, replace the charcoal canister.
(f)

Remove the plug.

7.

REMOVE VSV FOR EVAP

8.

INSPECT VSV FOR EVAP
(See page

SF–52

)

9.

REINSTALL VSV FOR EVAP

10.

REMOVE VSV FOR VAPOR PRESSURE SENSOR

11.

INSPECT VSV FOR VAPOR PRESSURE SENSOR
(See page

SF–56

)

12.

REINSTALL VSV FOR VAPOR PRESSURE SENSOR

13.

INSPECT VAPOR PRESSURE SENSOR
(See page

SF–58

)

14.

REINSTALL CHARCOAL CANISTER

EC01M–02

S05477

Disconnect

Ohmmeter

E2 VC

S05457

E2(–)

VC(+)

S05458

Disconnect

E2(–)

EGLS(+)

–

EMISSION CONTROL

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

EC–7

848

1997 LEXUS ES300 (RM511U)

EXHAUST GAS RECIRCULATION
(EGR) SYSTEM

INSPECTION

1.

INSPECT EGR SYSTEM
(See page

DI–118

)

2.

INSPECT EGR VALVE POSITION SENSOR

(a)

Inspect the resistance of the EGR valve position sensor.
(1)

Disconnect the EGR valve position sensor connec-
tor.

(2)

Using an ohmmeter, measure the resistance be-
tween the terminals VC and E2.

Resistance: 1.5 – 4.3 k

Ω

If the resistance is not as specified, replace the EGR valve posi-
tion sensor.

(3)

Reconnect the EGR valve position sensor connec-
tor.

(b)

Inspect the power output voltage of the EGR valve posi-
tion sensor.
(1)

Disconnect the vacuum hose from the EGR valve.

(2)

Turn the ignition switch ON.

(3)

Connect a voltmeter to terminals VC and E2 of the
ECU, and measure the power source voltage.

Voltage: 4.5 – 5.5 V
(4)

Connect a voltmeter to terminals EGLS and E2 of
the ECU, and measure the power outlet voltage un-
der the following conditions:

Using the MITYVAC (Hand–Held Vacuum
Pump), apply a vacuum (17.3 kPa, 130
mmHg, 5.1 in.Hg) to the EGR valve.

Voltage: 3.2 – 5.1 V

Release the vacuum from the EGR valve.

Voltage: 0.4 – 1.6 V

If the voltage is not as specified, replace the EGR valve position
sensor.

(5)

Reconnect the vacuum hose to the EGR valve.

3.

REMOVE EGR POSITION SENSOR

Remove the 3 nuts and EGR valve position sensor from the
EGR valve.

Torque: 2 N·m (20 kgf·cm, 17 in.·lbf)

4.

REINSTALL EGR POSITION SENSOR
Installation is the reverse order of removal.