Lexus GS300/400 (2000 year). Manual — part 128

B06545

B06743

Hose Clipper

Air Drain Hose

B06546

Pressure
Gauge

Pressure

EC–8

–

EMISSION CONTROL (2JZ–GE)

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

1459

(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)

Close off the air drain hose at the marked position
of the canister with a hose clipper or similar instru-
ment.

(2)

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

B06840

Air

Disconnect

EVAP Line Hose

B06841

Air

Disconnect

Plug

Disconnect

EVAP Line Hose

Purge Line
Hose

Purge Port

–

EMISSION CONTROL (2JZ–GE)

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–9

1460

(3)

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.

CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER
PIPE

(a)

Disconnect the EVAP line hose from the charcoal canister
side and then pressurize and make the internal pressure
in the fuel tank 4 kPa (41 gf/cm

, 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.

INSPECT FUEL CUTOFF VALVE AND FILL CHECK
VALVE

(a)

Disconnect the purge line hose and EVAP line hose from
the charcoal canister.

(b)

Disconnect the air drain hose from the canister tank, and
plug its.

(c)

Pressurize 4 kPa (41 gf/cm

, 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 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 and EVAP line hose to the
charcoal canister.

(f)

Reconnect the air drain hose to the canister tank.

B06842

Air

Air Inlet Line Hose

B06803

Push

Pinch

B06791

B06792

Air

Purge Port

Air Drain Port

EVAP Port

Cap

Vent Port

EC–10

–

EMISSION CONTROL (2JZ–GE)

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

1461

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.

REMOVE CHARCOAL CANISTER ASSEMBLY

(a)

Disconnect the RH rear drive shaft from the differential.
(See page

SA–52

)

(b)

Remove the charcoal canister assembly.
(1)

Disconnect the vapor pressure sensor connector.

(2)

Disconnect the VSV connector for vapor pressure
sensor.

(3)

Disconnect the purge line hose, EVAP line hose
and air inlet line from the charcoal canister.

(4)

Disconnect the vent line hose from the charcoal
canister.
Push the connector deep inside, pinch portion A,
and pull out the connector.

(5)

Disconnect the air drain hose from the chanister
tank.

(6)

Remove the 3 nuts and the charcoal canister as-
sembly.

INSPECT CHARCOAL CANISTER

(a)

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

(b)

Inspect the charcoal canister operation.
(1)

Plug the vent port with a cap.

(2)

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

, 0.26 psi) into the EVAP port and

check that air flows from the air drain port.

B06793

Air

Purge Port

EVAP
Port

Air Drain Port

Air Inlet Port

B06794

Vacuum

Purge Port

Air Inlet Port

B06795

Vacuum

Purge Port

EVAP
Port

Air Inlet Port

–

EMISSION CONTROL (2JZ–GE)

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–11

1462

(3)

While holding the purge port and the air drain port
closed, blow air (1.76 kPa, 18 gf/cm

, 0.26 psi) into

the EVAP port and check that air does not flow from
the air inlet port.

(4)

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

(5)

While holding the air inlet port closed, apply vacuum
(3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EVAP port
and check that air flows into the purge port.

If operation is not as specified, replace the charcoal canister.
10.

INSPECT VSV FOR EVAP
(See page

SF–52

)

11.

INSPECT VSV FOR VAPOR PRESSURE SENSOR
(See page

SF–57

)

12.

INSPECT VAPOR PRESSURE SENSOR
(See page

SF–61

)