Toyota Sequoia (2005). Manual - part 173

A23477

SST

Pressure Gauge

Pressure

B06546

–

DIAGNOSTICS

ENGINE

DI–487

681

27

Correctly reinstall or replace fuel tank cap.

HINT:

When reinstalling the fuel tank cap, tighten it until a few click sounds are heard.

When replacing the fuel tank cap, use a fuel tank cap that meets OEM specifications, and install it until
a few click sounds are heard.

NEXT

Go to step 37.

28

Replace fuel tank cap.

HINT:
When installing the fuel tank cap, tighten it until a few click sounds are heard.

NEXT

Go to step 37.

29

Repair EVAP leak part.

(a)

Prepare a rubber hose with a 15 to 18.5 mm inside diame-
ter.

(b)

Reinstall the fuel tank cap.

(c)

Disconnect the atmospheric side hose of the pump mod-
ule.

(d)

Connect the rubber tube to the pump module.

(e)

Using SST, pinch the rubber tube to close the canister
passage to air.
SST

00002–6872A

(f)

Connect a pressure gauge (SST) to the service port
(green cap near the air cleaner box).

(g)

Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28
mmHg).

(h)

Apply soapy water to the piping and connecting parts of
the EVAP system. Look for areas where bubbles appear.
This indicates leaking points.

(i)

Repair or replace leaking point.

HINT:

If the system has leaks, a whistling sound will be heard.

Disconnect the hose between the canister and the fuel
tank from the canister. Close the canister hose connected
to the fuel tank, and conduct an inspection. In this way, the
fuel tank can be excluded as an area suspected of caus-
ing fuel leaks.

NEXT

Go to step 36.

DI–488

–

DIAGNOSTICS

ENGINE

682

30

Replace charcoal canister.

NEXT

Go to step 37.

31

Replace EVAP VSV (See page 

EC–8

).

(a)

Disconnect the connector and the hoses from the purge VSV.

(b)

Remove the purge VSV.

(c)

Install a new purge VSV.

(d)

Reconnect the connector and hoses.

NEXT

Go to step 37.

32

Repair or replace wire harness or connector.

NEXT

Go to step 37.

33

Replace EVAP hose between EVAP VSV and throttle body.

NEXT

Go to step 37.

34

Inspect throttle body.

(a)

Remove the throttle body (see page 

SF–42

).

(b)

Check that the EVAP purge port of the throttle body is not clogged. If necessary, replace the throttle
body.

NEXT

Go to step 37.

35

Replace ECM (See page 

SF–80

)

NEXT

Go to step 37.

–

DIAGNOSTICS

ENGINE

DI–489

683

36

Repair or replace parts and components indicated by output DTCs.

(a)

Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was
brought in.

NEXT

Go to step 37.

37

Perform EVAP system auto operation check.

NOTICE:

In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 4 EVAP SYSTEM CHECK steps
is performed automatically. It takes a maximum of approximately 15 minutes.

Do not perform the EVAP SYSTEM CHECK when the fuel tank is more than 90 % full because
the cut–off valve may be closed and making the leak check of the fuel tank unavailable.

Do not run the engine in this step.

When the temperature of the fuel is 35



C

 

(95



F) or more, a large amount of vapor forms and any

check results become inaccurate. When performing an EVAP SYSTEM CHECK, keep the tem-
perature below 35



C

 

(95



F).

(a)

Clear DTCs (see page 

DI–43

).

(b)

On the hand–held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYS-
TEM CHECK / EVAP SYS CHECK / AUTO OPERATION.

(c)

After the SYSTEM CHECK is completed, check for pending DTCs by selecting the following menu
items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

HINT:
If no pending DTC is found, the repair has been successfully completed.

NEXT

Completed

Monitor Confirmation

HINT:
After a repair, check Monitor Status by performing the Key–Off Monitor Confirmation and Purge Flow Monitor
Confirmation described below.
1.

KEY–OFF MONITOR CONFIRMATION

(a)

Preconditions
The monitor will not run unless:

The vehicle has been driven for 10 minutes or more (in a city area or on a free way)

The fuel tank is less than 90 % full

The altitude is less than 8,000 ft (2,400 m)

The Engine Coolant Temperature (ECT) is between 4.4



C and 35



C (40



F and 95



F)

The Intake Air Temperature (IAT) is between 4.4



C and 35



C (40



F and 95



F)

The vehicle remains stationary (the vehicle speed is 0 mph [0 km/h])

DI–490

–

DIAGNOSTICS

ENGINE

684

(b)

Monitor Conditions
(1)

Allow the engine to idle for at least 5 minutes.

(2)

Turn the ignition switch to OFF and wait for 6 hours (8 or 10.5 hours).

HINT:
Do not start the engine until checking MONITOR STATUS. If the engine is started, the steps described above
must be repeated.
(c)

Monitor Status
(1)

Connect a hand–held tester to the DLC3.

(2)

Turn the ignition switch to ON and turn the tester ON.

(3)

On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR
STATUS.

(4)

Check the Monitor Status displayed on the tester.

HINT:
If INCMP is displayed, the monitor is not completed. Make sure that the preconditions have been met, and
perform the Monitor Conditions again.
2.

PURGE FLOW MONITOR CONFIRMATION (P0441)

HINT:
Perform this monitor confirmation after the Key–Off Monitor Confirmation shows COMPL (complete).
(a)

Preconditions
The monitor will not run unless:

The vehicle has been driven for 10 minutes or more (in a city area or on a free way)

The ECT is between 4.4



C and 35



C (40



F and 95



F)

The IAT is between 4.4



C and 35



C (40



F and 95



F)

(b)

Monitor Conditions
(1)

Release the pressure from the fuel tank by removing and reinstalling the fuel tank cap.

(2)

Warm the engine up until the ECT reaches more than 75



C (167



F).

(3)

Increase the engine speed to 3,000 rpm once.

(4)

Allow the engine to idle and turn A/C ON for 1 minute.

(c)

Monitor Status
(1)

Turn the ignition switch to OFF (where ON or the engine is running).

(2)

Connect a hand–held tester to the DLC3.

(3)

Turn the ignition switch to ON and turn the tester ON.

(4)

On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR
STATUS.

(5)

Check the Monitor Status displayed on the tester.

HINT:
If INCMP is displayed, the monitor is not completed. Make sure that the preconditions have been met, and
perform the Monitor Conditions again.