Lexus LS400 (2000 year). Manual — part 73

EC0ES–01

B04812

Gasket

Check Valve (Vacuum Valve)

B06544

Vacuum
Gauge

Q06528

LEXUS Hand–Held Tester

DLC3

B05795

Battery

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–7

1309

INSPECTION

1.

INSPECT LINES AND CONNECTIONS

Visually check for loose connections, sharp bends or damage.
2.

INSPECT FUEL TANK

Visually check for deformation, cracks or fuel leakage.

3.

INSPECT FUEL TANK CAP

Visually check if the cap and/or gasket are deformed or dam-
aged.
If necessary, repair or replace the cap.

4.

INSPECT EVAP SYSTEM LINE

(a)

Warm up the engine and stop the engine.
Allow the engine to warm up to normal operating tempera-
ture.

(b)

Install a vacuum gauge (EVAP control system test equip-
ment vacuum gauge) to the EVAP service port on the
purge line.

(c)

LEXUS Hand–Held Tester:
Forced driving of the VSV for the EVAP.
(1)

Connect a LEXUS hand–held tester to the DLC3.

(2)

Start the engine.

(3)

Push the LEXUS hand–held tester main switch ON.

(4)

Use the ACTIVE TEST mode on the LEXUS hand–
held tester to operate the VSV for the EVAP.

(d)

If you have no LEXUS Hand–Held Tester:
Forced driving of the VSV for the EVAP.
(1)

Disconnect the VSV connector for the EVAP.

(2)

Connect the positive (+) and negative (–) leads from
the battery to the VSV terminals for the EVAP.

(3)

Start the engine.

B06545

B09991

Hose Clipper

Air Drain Hose

Yellow Marked
Position

B06546

Pressure
Gauge

Pressure

EC–8

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

1310

(e)

Check the vacuum at idle.
Vacuum:
Maintain at 0.368 – 19.713 in.Hg (5 – 268 in.Aq) for over
5 seconds

HINT:
If the vacuum does not change, you can conclude that the hose
connecting the VSV to the service port has come loose or is
blocked, or the VSV is malfunctioning.
(f)

LEXUS Hand–Held Tester:
Conclude forced driving of the VSV for the EVAP.
(1)

Stop the engine.

(2)

Disconnect the LEXUS hand–held tester from the
DLC3.

(g)

If you have no LEXUS Hand–Held Tester:
Conclude forced driving of the VSV for the EVAP.
(1)

Stop the engine.

(2)

Disconnect the positive (+) and negative (–) leads
from the battery from the VSV terminals for the
EVAP.

(3)

Connect the VSV connector for the EVAP.

(h)

Disconnect the vacuum gauge from the EVAP service
port on the purge line.

(i)

Connect a pressure gauge to the EVAP service port on
the purge line.

(j)

Check the Pressure.
(1)

Pull off the service hole cover of the trim front cover.

(2)

Close off at the yellow marked position of the air
drain hose with a hose clipper or similar instrument.

(3)

Add the pressure (13.5 – 15.5 in.Aq) from the EVAP
service port.

Pressure:
2 minutes after the pressure is added, the gauge
should be over 7.7 – 8.8 in.Aq.

HINT:
If you can’t add pressure, you can conclude that the hose con-
necting the VSV

canister

fuel tank has slipped off or the

VSV is open.

B06547

Fuel Tank Cap

B09992

Air

Disconnect

EVAP Line Hose

B09993

Purge
Port

EVAP Line Hose

Purge
Line Hose

Air Drain Hose

Disconnect

Cap

Disconnect

Disconnect

Air

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–9

1311

(4)

Check if the pressure decreases when the fuel tank
cap is removed while adding pressure.

HINT:
If the pressure does not decrease when the filler cap is re-
moved, then you can conclude that the hose connecting the
service port to the fuel tank is blocked, etc.
(k)

Disconnect the pressure gauge from the EVAP service
port on the purge line.

5.

CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER
PIPE

(a)

Disconnect the EVAP line hose from the charcoal canister
side (See step 8) and then pressurize and make the inter-
nal pressure in the fuel tank 4 kPa (41 gf/cm

2

, 0.58 psi).

(b)

Check that the internal pressure of the fuel tank can be
hold for 1 minute.

(c)

Check the connected portions of each hose and pipe.

(d)

Check the installed parts on the fuel tank.

If there is no abnormality, replace the fuel tank and filler pipe.
(e)

Reconnect the EVAP line hose to the charcoal canister.

6.

INSPECT FUEL CUTOFF VALVE AND FILL CHECK
VALVE

(a)

Disconnect the purge line hose, EVAP line hose and air
drain hose from the charcoal canister (See step 8).

(b)

Plug the cap to the air drain port.

(c)

Pressurize 4 kPa (41 gf/cm

2

, 0.58 psi) to the purge port

and check that there is ventilation through the EVAP line
hose.

HINT:
In the condition that the fuel is full, as the float value of the fill
check valve is closed and has no ventilation, it is necessary to
check the fuel amount (volume).
(d)

Check if there is any struck in the vent line hose and EVAP
line hose.

If there is no stuck in hoses, replace the fuel cutoff valve and fill
check valve.
(e)

Reconnect the purge line hose, EVAP line hose and air
drain hose to the charcoal canister.

B09994

Air

Disconnect

Air Inlet
Line Hose

B09995

Push

Pinch

A

A

A

A

Pinch

Pinch

Pinch

Push

B09996

EC–10

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

1312

7.

CHECK AIR INLET LINE

(a)

Disconnect the air inlet line hose from the charcoal canis-
ter.

(b)

Check that there is ventilation in the air inlet line.

(c)

Reconnect the air inlet line hose to the charcoal canister.

8.

REMOVE CHARCOAL CANISTER ASSEMBLY

(a)

Remove the rear seat cushion and rear seat back.

(b)

Remove the front scuff plate, assist grip, front pillar gar-
nish, quarter trim, front seat outer belt, roof side inner gar-
nish and package tray trim (See page

BO–64

).

(c)

Remove the luggage compartment floor mat and trim
front cover.

(d)

Disconnect the VSV connector for the pressure switching
valve.

(e)

Disconnect the wire clip from the charcoal canister brack-
et.

(f)

Disconnect the air inlet line hose from the charcoal canis-
ter.

(g)

Disconnect the purge line hose, EVAP line hose, vent line
hose and air drain hose from the charcoal canister.
(1)

Push the connector deep inside.

(2)

Pinch portion A.

(3)

Pull out the connector.

(h)

Remove the 3 bolts, charcoal canister and bracket as-
sembly.

(i)

Remove the 3 charcoal canister mounting bolts and char-
coal canister.

9.

INSPECT CHARCOAL CANISTER

(a)

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