Toyota Sequoia (2005). Manual - part 172

A23446

L5

A23508

Wire Harness Side:

Canister Connector

Front View

L5

–

DIAGNOSTICS

ENGINE

DI–483

677

21

Inspect pump module power source circuit.

PREPARATION:
(a)

Turn the ignition switch to OFF.

(b)

Disconnect the L5 canister connector.

(c)

Turn the ignition switch to ON.

CHECK:
Measure the voltage between terminal 9 of the canister connec-
tor and the body ground.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Between 9 V and 14 V

Normal

A

Between 0 V and 3 V

Power source wire harness of vent valve

B

B

Go to step 32.

A

B17423

8 (–)

9 (+)

Charcoal Canister Assy:

B17411

MPMP

E4

DI–484

–

DIAGNOSTICS

ENGINE

678

22

Inspect vent valve operation of pump module.

PREPARATION:
(a)

Disconnect the L5 canister connector.

(b)

Turn the ignition switch to OFF.

(c)

Apply the battery voltage to terminals 9 and 8 of the pump
module.

CHECK:
Touch the pump module to confirm the vent valve operation.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Operating

Wire harness between vent valve and ECM

A

Not operating

Vent valve

B

A

Go to step 32.

B

Go to step 30.

23

Perform active test for vacuum pump.

PREPARATION:
On the hand–held tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VACUUM
PUMP (ALONE).
CHECK:
Measure the voltage between terminal MPMP of the ECM con-
nector and the body ground when the vacuum pump is turned
ON and OFF using the tester.

Result:

Tests Results

Suspected Trouble Areas

Proceed To

Between 0 V and 3 V when OFF
Between 9 V and 14 V when ON

ECM normal

A

Between 9 V and 14 V when OFF
Between 0 V and 3 V when ON

ECM

B

B

Go to step 35.

A

A23446

L5

A23508

Wire Harness Side:

Canister Connector

Front View

L5

–

DIAGNOSTICS

ENGINE

DI–485

679

24

Check for open and short circuit in harness and connecter between pump mod-
ule and ECM.

PREPARATION:
(a)

Turn the ignition switch to OFF.

(b)

Disconnect the L5 canister connector.

(c)

Turn the ignition switch to ON.

(d)

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

(e)

Turn the vacuum pump ON.

CHECK:
Measure the voltage between terminal 1 of the canister connec-
tor and the body ground.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Between 9 V and 14 V

Normal

A

Between 0 V and 3 V

Wire harness between ECM and vacuum pump

B

B

Go to step 32.

A

A23508

Wire Harness Side:

Canister Connector

Front View

L5

DI–486

–

DIAGNOSTICS

ENGINE

680

25

Check for open and short in harness and connector between pump module and
ECM.

PREPARATION:
(a)

Disconnect the L5 canister connector.

(b)

Turn the ignition switch to OFF.

CHECK:
Check the resistance between terminal 6 of the canister con-
nector and the body ground.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Below 1 

Ω

Vacuum pump

A

10 k

Ω

 or more

Wire harness between vacuum pump and body
ground

B

A

Go to step 30.

B

Go to step 32.

26

Inspect throttle body.

PREPARATION:
(a)

Stop the engine.

(b)

Disconnect the EVAP hose from the throttle body.

(c)

Start the engine.

CHECK:
(a)

Use your finger to confirm that the port of the throttle body has suction.

RESULT:

Test Results

Suspected Trouble Areas

Proceed To

Suction applied

EVAP hose between throttle body and purge VSV

A

No suction

Throttle body

B

A

Go to step 33.

B

Go to step 34.