Toyota Sequoia (2005). Manual - part 682

EC0JL–03

B17594

Gasket

B06544

Vacuum Gauge

D13872

Hand–Held Tester

DLC3

CAN VIM

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–9

2717

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 to normal operating temperature and
stop the engine.

(b)

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

(c)

When using a hand–held tester:
Operation of the VSV for EVAP.
(1)

Connect a hand–held tester to the Controller Area
Network Vehicle Interface Module (CAN VIM). Then
connect the CAN VIM to the Date Link Connector 3
(DLC3).

(2)

Start the engine.

(3)

Turn the hand–held tester ON.

(4)

Enter the following menus: DIAGNOSIS / EN-
HANCED OBDII/ ACTIVE TEST / EVAP VAV
(ALONE)

B16489

Battery

B06545

Vacuum Gauge

B17595

EC–10

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

2718

(d)

When not using a hand–held tester:
Operation of the VSV for the EVAP.
(1)

Disconnect the VSV for the EVAP connector.

(2)

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

(3)

Start the engine.

(e)

Check the vacuum when the engine idles.
Vacuum:
Maintain between 0.368 and 19.713 in.Hg (5 to 268
in.Aq) for over 5 seconds

HINT:
If the vacuum does not change, the hose connecting the VSV
and the service port is loose or blocked, or the VSV is malfunc-
tioning.
(f)

When using a hand–held tester:
Conclude operation of the VSV for EVAP.
(1)

Stop the engine.

(2)

Disconnect the hand–held tester from the DLC3.

(g)

When not using a hand–held tester:
Conclude operation of the VSV for EVAP.
(1)

Stop the engine.

(2)

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

(3)

Connect the VSV for EVAP connector.

(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)

Prepare a rubber hose that has an inside diameter
of 15 to 18.5 mm.

(2)

Disconnect the atmospheric side hose of the pump
module.

(3)

Connect the prepared rubber hose to the pump
module, and pinch the rubber hose with the clip to
prevent air from entering into the canister passage.

B06546

Pressure Gauge

Pressure

B17596

Fuel Tank Cap

Pressure
Gauge

B17662

Fuel Tank Cap

Fuel Tank

Vent Line Hose

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

EC–11

2719

(4)

Apply pressure (13.5 to 15.5 in.Aq, 0.99 to 1.14
in.Hq) from the EVAP service port.

Pressure:
The gauge should still read over 7.7 to 8.8 in.Aq (0.57
to 0.65 in.Hq) for 2 minutes after the pressure is ap-
plied.

HINT:
If you cannot apply pressure, the hose connecting the VSV,
charcoal canister and fuel tank has slipped off or the VSV is
open.

(5)

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

HINT:
If the pressure does not decrease when the filler cap is re-
moved, the hose connecting the service port and the fuel tank
may be blocked.
(k)

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

5.

INSPECT FUEL CUTOFF VALVE AND FILL CHECK
VALVE

(a)

Disconnect the vent line hose from the fuel tank.

(b)

Connect the pressure gauge to the fuel tank.

(c)

Fill the fuel tank with fuel.

(d)

Apply pressure of 4 kPa (41 gf/cm

2

,0.58 psi) to the vent

port of the fuel tank.

HINT:
It is necessary to check the amount of fuel in the fuel tank. When
the fuel tank is full, the float valve of the fill check valve is closed
and no air can pass through.
(e)

Remove the fuel tank cap, and check that the pressure
drops.

If the pressure does not drop, replace the fuel tank assembly.
(f)

Reconnect the vent line hose to the fuel tank.

B17598

Air Inlet Hose

Air

B17599

B17600

Air

Air Inlet Port

Vent Port

Purge Port

B17601

Purge Port

Air

Vent Port

Air Inlet Port

EC–12

–

EMISSION CONTROL

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

2720

6.

CHECK AIR INLET LINE

(a)

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

(b)

Check that air can flow freely into the air inlet line.

If air cannot flow freely into the air inlet line, repair or replace it.
(c)

Reconnect the air inlet line hose to the charcoal canister.

7.

REMOVE CHARCOAL CANISTER ASSEMBLY

8.

INSPECT CHARCOAL CANISTER ASSEMBLY

(a)

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

If cracks or damage are found, replace the charcoal canister as-
sembly.

(b)

Check charcoal canister operation.
(1)

With the purge port closed, blow 1.67 kPa (17.0 gf/
cm

2

, 0.24 psi) of air into the vent port, and check

that air flows from the air inlet port.

If the result is not as specified, replace the charcoal canister as-
sembly.

(2)

With the vent port closed, blow 1.10 kPa (11.2 gf/
cm

2

, 0.16 psi) air to the air inlet port, and check that

air flows from the purge port.

If the result is not as specified, replace the charcoal canister as-
sembly.