Lexus RX300 (MCU15). Service manual - part 427

EC0I3–01

B01082

Gasket

B12170

Cap

B12171

Air

Port A

Port B

Port C

Compressed 
Air

B12172

Compressed Air

Air

Air

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–5

LEXUS RX300   (RM785E)

EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM

INSPECTION

1.

VISUALLY INSPECT LINES AND CONNECTORS

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

VISUALLY INSPECT FUEL TANK FILLER PIPE

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 ASSEMBLY

Disconnect the 2 hoses and pull up the canister.

5.

INSPECT CHARCOAL CANISTER

(a)

Remove the charcoal canister cap.

(b)

Visually check the charcoal canister for cracks or dam-
age.

(c)

While holding port C closed, using low pressure com-
pressed air (4.9 kPa (50 gf/cm

2

, 0.71 psi)), blow into port

A and check that air flows without resistance from the port
B.

(d)

Using low pressure compressed air (4.9 kPa (50 gf/cm

2

,

0.71 psi)), blow into port A and check that air flows without
resistance from the other ports.

B12173

Vacuum

Port A

Port C

Port B

Cap

B12174

Port A

Port B

Compressed 
Air

Port C

EC–6

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

LEXUS RX300   (RM785E)

(e)

Apply vacuum (1.96 kPa (20 gf/cm

2

, 0.28 psi)) to port A,

check that the vacuum does not decrease when port B
and C are closed, and check that the vacuum decreases
when port B is opened.

If a problem is found, replace the charcoal canister.

6.

CLEAN FILTER IN CANISTER

Clean the filter by blowing 19.6 kPa (0.2 kgf/cm

2

, 2.8 psi) of

compressed air into port B while holding port A closed.
NOTICE:

S

Do not attempt to wash the canister.

S

No activated carbon should come out.

7.

REINSTALL CHARCOAL CANISTER

EC020–05

–

EMISSION CONTROL

WARM UP THREE–WAY CATALYTIC CONVERTER 
(WU–TWC) SYSTEM

EC–7

LEXUS RX300   (RM785E)

WARM UP THREE–WAY CATALYTIC CONVERTER
(WU–TWC) SYSTEM

ON–VEHICLE INSPECTION

1.

INSPECT EXHAUST PIPE ASSEMBLY

(a)

Check the connections for looseness or damage.

(b)

Check the clamps for weakness, cracks or damage.

2.

INSPECT WU–TWC

Check for dents or damage.
If any part of the protector is damaged or dented to the extent that it contacts the WU–TWC, repair or replace
it.
3.

INSPECT WU–TWC HEAT INSULATOR

(a)

Check the heat insulator for damage.

(b)

Check for adequate clearance between the catalytic converter and heat insulator.

EC021–07

B12567

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

z

 Non–reusable part

WU–TWC for Bank 1

z

 Gasket

56 (570, 41)

z

 Gasket

48 (490, 36)

z

z

Compression Spring

62 (630, 46)

Front Exhaust Pipe

WU–TWC (for Bank 1)

z

 Gasket

48 (490, 36)

Compression 
Spring

EC–8

–

EMISSION CONTROL

WARM UP THREE–WAY CATALYTIC CONVERTER 
(WU–TWC) SYSTEM

LEXUS RX300   (RM785E)

COMPONENTS