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12-1
EMISSION CONTROL - EMISSION CONTROL SYSTEM

EMISSION CONTROL SYSTEM
1209K-03

ON-VEHICLE INSPECTION

1. VISUALLY INSPECT HOSES, CONNECTIONS AND
GASKETS
(a) Check for cracks, leaks or damage.
HINT:
Separation of the engine oil dipstick, oil filler cap, PCV hose,
etc. may cause the engine to run improperly. Disconnection,
looseness or cracks in the parts of the air induction system be-
tween the throttle body and the cylinder head will allow air suc-
P12931 tion and cause the engine to run improperly.

2. INSPECT EVAP SYSTEM LINE
Vacuum Gauge (a) Warm up the engine to normal operating temperature.
(b) Turn the engine OFF.
(c) Connect the vacuum gauge (EVAP control system test
equipment vacuum gauge) to the EVAP service port on
the purge line.

B06544 A75352

(d) If you have the hand-held tester:
Turn on the VSV for EVAP using the hand-held tester.
(1) Connect the hand-held tester to the DLC3.
(2) Start the engine.
(3) Push the hand-held tester main switch ON.
(4) Use the ACTIVE TEST mode on the hand-held tes-
ter to operate the VSV for EVAP.

A75313

(e) If you have no hand-held tester:
Turn on the VSV for EVAP using the lead wires.
(1) Disconnect the VSV for EVAP connector.
(2) Connect the positive (+) and negative (-) leads from
the battery to the VSV for EVAP terminals.
(3) Start the engine.
Battery

A75314

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2284
12-2
EMISSION CONTROL - EMISSION CONTROL SYSTEM

(f) Check the vacuum at idle.
Vacuum Gauge Vacuum:
Maintain at 0.368 to 19.713 in.Hg (5 to 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 become loose or is
blocked, or the VSV is malfunctioning.
B06545 A75353 (g) If you have the hand-held tester:
Return to normal the VSV for EVAP operation.
(1) Stop the engine.
(2) Disconnect the hand-held tester from the DLC3.
(h) If you have no hand-held tester:
Return to normal the VSV for EVAP operation.
(1) Stop the engine.
(2) Disconnect the positive (+) and negative (-) leads
from the VSV for EVAP terminals.
(3) Reconnect the VSV for EVAP connector.
(i) Disconnect the vacuum gauge from the EVAP service
port on the purge line.
(j) Connect the pressure gauge to the EVAP service port on
Pressure Gauge the purge line.

A72589

(k) If you have the hand-held tester:
Turn on the VSV for CCV using the hand-held tester.
(1) Connect the hand-held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) Push the hand-held tester main switch ON.
(4) Use the ACTIVE TEST mode on the hand-held tes-
ter to operate the VSV for CCV.
NOTICE:
A75313 Do not start the engine.
HINT:
If the check is not completed within 10 minutes, the forced close
of VSV for CCV will be reset.

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2285
12-3
EMISSION CONTROL - EMISSION CONTROL SYSTEM

(l) If you have no hand-held tester:
Turn on the VSV for the CCV using the lead wires.
(1) Disconnect the VSV for CCV connector.
(2) Connect the positive (+) and negative (-) leads from
the battery to the VSV for CCV terminals.

Battery
A75315

(m) Check the pressure.
Pressure Gauge (1) Add the pressure (13.5 to 15.5 in.Aq) from the
EVAP service port.
Pressure:
2 minutes after the pressure is added, the gauge
should be over 7.7 to 8.8 in.Aq.
HINT:
Pressure If you can not add pressure, you can conclude that the hose
B06546 A75354 connecting the VSV for EVAP canister fuel tank has slipped off
or the VSV is open.
(2) Check if the pressure decreases when the fuel tank
Fuel Tank Cap cap is removed while adding pressure.
HINT:
If the pressure does not decrease when the fuel tank cap is re-
moved, you can conclude that the hose connecting the service
port to the fuel tank is blocked, etc.
(n) If you have the hand-held tester:
Turn to normal VSV for CCV operation.
A67133 (1) Turn ignition switch OFF.
(2) Disconnect the hand-held tester from the DLC3.
(o) If you have no hand-held tester:
Turn to normal VSV for CCV operation.
(1) Disconnect the positive (+) and negative (-) leads
from the VSV for CCV terminals.
(2) Reconnect the VSV for CCV connector.
(p) Disconnect the pressure gauge from the EVAP service
port on the purge line.

3. CHECK AIR TIGHTNESS IN FUEL TANK AND FILLER
PIPE
Vent Line Hose (a) Disconnect the vent line hose from the charcoal canister.
(b) Apply pressure to fuel tank and make the internal pres-
sure of the fuel tank 4 kPa (41 gf/cm2, 0.58 psi).
(c) Check that the internal pressure of the fuel tank remains
stable for 1 minute.
(d) Check the connected portions of each hose and pipe.
A79105

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2286
12-4
EMISSION CONTROL - EMISSION CONTROL SYSTEM

(e) Check the installed parts on the fuel tank.
If they are OK, replace the fuel tank and filler pipe.
(f) Reconnect the vent line hose to the fuel tank.

4. INSPECT FUEL CUTOFF VALVE AND FILL CHECK
VALVE
(a) Disconnect the vent line hose from the charcoal canister.
(b) Apply pressure of 4 kPa (41 gf/cm2, 0.58 psi) to the vent
port of the fuel tank.
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).
Fuel Tank Cap (c) Remove the fuel tank cap, and check that pressure drops.
If pressure does not drop, replace the fuel tank assembly.
Vent Line Hose
(d) Reconnect the vent line hose to the fuel tank.

A75318

5. CHECK AIR INLET LINE
Air Inlet Line Hose (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.

Air
A75317

ECM 6. INSPECT VAPOR PRESSURE SENSOR
VC (a) Inspect power source voltage of the vapor pressure sen-
sor.
(1) Turn the ignition switch ON.
(2) Using a voltmeter, measure the voltage between
Voltmeter
connector terminals VC and E2 of the wiring har-
E2 ness side.
Voltage: 4.5 to 5.5 V
A75319 (3) Turn the ignition switch OFF.

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2287
12-5
EMISSION CONTROL - EMISSION CONTROL SYSTEM

PTNK (b) Inspect power output of the vapor pressure sensor.
ECM
(1) Turn the ignition switch ON.
(2) Remove the fuel tank cap.
(3) Using a voltmeter, measure the voltage between
Voltmeter
connector terminals PTNK and E2 of the wiring har-
ness side.
E2 Voltage: 3.0 to 3.6 V
(4) Reinstall the fuel tank cap.
A75320

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2288

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