Lexus ES300 (1997 year). Service manual — part 454

S05452

S05455

(1)

(2)

(3)

S05454

S05478

Z Port

S Port

S05476

(kPa, mmHg, in.Hg)

V

acuum

(3 Times)

10 sec.

Time

Pumping

EC–8

–

EMISSION CONTROL

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

849

1997 LEXUS ES300 (RM511U)

5.

REMOVE EGR VALVE

(a)

Remove the EGR pipe.

Remove the 4 nuts, EGR pipe and 2 gaskets.

HINT:
Install 2 new gaskets.

Torque: 12 N·m (120 kgf·cm, 9 ft·lbf)

(b)

Disconnect the EGR gas temperature sensor connector
and clamp.

(c)

Remove the EGR valve.
(1)

Disconnect these hoses and connector:

EVAP hose from EGR valve hook

Vacuum hose from EGR valve

EGR valve position sensor connector

(2)

Remove the 3 nuts, EGR valve and gasket.

HINT:
Install a new gasket.

Torque:12 N·m (120 kgf·cm, 9 ft·lbf)

(d)

Remove the EGR gas temperature sensor.
Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)

6.

INSPECT EGR VALVE

Check for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve.
7.

REINSTALL EGR VALVE
Installation is the reverse order of removal.

8.

REMOVE VCV

9.

INSPECT VCV

(a)

Connect the MITYVAC (Hand–Held Vacuum Pump) to
port S of the VCV.

(b)

Plug port Z completely with fingers.

(c)

Perform pumping 3 times and apply vacuum as shown in
the illustration.

(d)

Stop the performing pumping and check the indicated val-
ue of the MITYVAC after about 10 seconds.
Standard value:
15 – 24 kPa (112 – 180 mmHg, 4.4 – 7.1 in.Hg)

If the indicated value is not as specified, replace the VCV.
10.

REINSTALL VCV

11.

INSPECT VSV FOR EGR
(See page

SF–50

)

EC01P–01

–

EMISSION CONTROL

THREE–WAY CATALYTIC CONVERTER (TWC)
SYSTEM

EC–9

850

1997 LEXUS ES300 (RM511U)

THREE–WAY CATALYTIC CONVERTER (TWC) SYSTEM

INSPECTION

1.

CHECK TWC FOR DENTS OR DAMAGE

If any part of the protector is damaged or dented to the extent that it contacts the three–way catalytic convert-
er, repair or replace it.
2.

CHECK EXHAUST PIPE CONNECTIONS FOR
LOOSENESS OR DAMAGE

3.

CHECK EXHAUST PIPE CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE

4.

CHECK HEAT INSULATOR FOR DAMAGE

5.

CHECK FOR ADEQUATE CLEARANCE BETWEEN CATALYTIC CONVERTER AND HEAT
INSULATOR

EC01P–01

–

EMISSION CONTROL

THREE–WAY CATALYTIC CONVERTER (TWC)
SYSTEM

EC–9

850

1997 LEXUS ES300 (RM511U)

THREE–WAY CATALYTIC CONVERTER (TWC) SYSTEM

INSPECTION

1.

CHECK TWC FOR DENTS OR DAMAGE

If any part of the protector is damaged or dented to the extent that it contacts the three–way catalytic convert-
er, repair or replace it.
2.

CHECK EXHAUST PIPE CONNECTIONS FOR
LOOSENESS OR DAMAGE

3.

CHECK EXHAUST PIPE CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE

4.

CHECK HEAT INSULATOR FOR DAMAGE

5.

CHECK FOR ADEQUATE CLEARANCE BETWEEN CATALYTIC CONVERTER AND HEAT
INSULATOR

EC01Q–01

S05048

EC–10

–

EMISSION CONTROL

THREE–WAY CATALYTIC CONVERTER (TWC)
SYSTEM

851

1997 LEXUS ES300 (RM511U)

REPLACEMENT

1.

REMOVE CONVERTER

(a)

Jack up the vehicle.

(b)

Check that the converter is cool.

(c)

Remove the 2 bolts and exhaust pipe stay.
Torque: 33 N·m (330 kgf·cm, 24 ft·lbf)

(d)

Remove the 2 bolts, and disconnect the bracket.
Torque: 33 N·m (330 kgf·cm, 24 ft·lbf)

(e)

Remove the 2 bolts and 2 nuts holding the front exhaust
pipe to the center exhaust pipe.
Torque: 56 N·m (570 kgf·cm, 41 ft·lbf)

(f)

Remove the 4 nuts holding the front exhaust pipe to the
exhaust manifolds.
Torque: 62 N·m (630 kgf·cm, 46 ft·lbf)

(g)

Remove the front exhaust pipe (converter) and 3 gaskets.

HINT:
At the time of installation, please refer to the following items.
Install 3 new gaskets.
2.

INSTALL CONVERTER
Installation is the reverse order of removal.