Toyota Sequoia (2005). Manual - part 171

B17419

Hose

Purge VSV

B17420

Hose

Purge VSV

–

DIAGNOSTICS

ENGINE

DI–479

673

14

Inspect EVAP VSV.

PREPARATION:
(a)

Turn the ignition switch to OFF.

(b)

Disconnect the V4 purge VSV connector.

(c)

Disconnect the hose (connected to the canister) from the
purge VSV.

(d)

Start the engine.

CHECK:
Use your finger to confirm that the purge VSV has no suction.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

No suction

ECM

A

Suction applied

Purge VSV

B

A

Go to step 34.

B

Go to step 30.

15

Check EVAP hose between purge VSV and throttle body.

PREPARATION:
(a)

Disconnect the hose (connected to the throttle body) from
the purge VSV.

(b)

Start the engine.

CHECK:
(a)

Use your finger to confirm that the hose has suction.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Suction applied

EVAP hose between purge VSV and throttle body
normal

A

No suction

Throttle body

EVAP hose between purge VSV and throttle
body

B

B

Go to step 26.

A

B02272

Battery

Air

B17440

Wire Harness Side:

Purge VSV Connector

V4

Front View

DI–480

–

DIAGNOSTICS

ENGINE

674

16

Inspect EVAP VSV.

PREPARATION:
(a)

Remove the purge VSV.

(b)

Apply battery voltage to the terminals of the purge VSV.

CHECK:
Using an air gun, confirm that air flows from port A to port B.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Suction applied

EVAP hose between purge VSV and throttle body
normal

A

No suction

Throttle body

EVAP hose between purge VSV and throttle
body

B

B

Go to step 31.

A

17

Measure purge VSV terminal voltage.

PREPARATION:
(a)

Disconnect the V4 purge VSV connector.

(b)

Turn the ignition switch to ON.

CHECK:
(a)

Measure the voltage between terminal 1 of the purge VSV
connector and the body ground.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Between 11 V and 14 V

Normal

A

Other than result above

Wire harness or connectors between purge VSV
and ECM

B

B

Go to step 32.

A

B17412

PRG

E8

B17440

Wire Harness Side:

Purge VSV Connector

V4

Front View

B17411

VPMP

E4

–

DIAGNOSTICS

ENGINE

DI–481

675

18

Check for open and short circuit in harness and connector between purge VSV
and ECM.

PREPARATION:
Disconnect the E8 ECM connector and the V4 purge VSV con-
nector.
CHECK:
Check the resistance.
OK:
Standard:

Tester Connections

Specified Conditions

E8–34 (PRG) – V4–1

Below 1 

Ω

E8–34 (PRG) – Body ground

10 k

Ω

 or higher

V4–1 – Body ground

10 k

Ω

 or higher

OK

Go to step 35.

NG

Go to step 32.

19

Perform active test for vent valve.

PREPARATION:
(a)

Turn the ignition switch to ON.

(b)

On the hand–held tester, select the following menu items:
DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ VENT
VALVE (ALONE).

CHECK:
Measure the voltage between terminal VPMP of the ECM con-
nector and the body ground when the vent valve is turned ON
(close) and OFF (vent) using the tester.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Between 9 V and 14 V when OFF
Below 3 V when ON

Vent valve

A

Below 3 V when OFF and ON

ECM

B

A

Go to step 22.

B

Go to step 35.

B17411

VPMP

E4

DI–482

–

DIAGNOSTICS

ENGINE

676

20

Perform active test for vent valve.

PREPARATION:
(a)

Turn the ignition switch to ON.

(b)

On the hand–held tester, select the following menu items:
DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ VENT
VALVE (ALONE).

CHECK:
Measure the voltage between terminal VPMP of the ECM con-
nector and the body ground when the vent valve is turned ON
(close) and OFF (vent) using the tester.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Below 3 V when OFF and ON

Power source of vent valve

A

Between 9 V and 14 V when OFF
Below 3 V when ON

Vent valve

B

Between 9 V and 14 V when OFF and ON

ECM

C

B

Go to step 24.

C

Go to step 35.

A