Toyota Sequoia (2005). Manual - part 132

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

VV

B17440

A46

Air Switching Valve Connector

Wire Harness Side:

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

SIV

–

DIAGNOSTICS

ENGINE

DI–323

517

4

Check for open and short in harness and connector between air injection driver
and air switching valve.

PREPARATION:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Disconnect the A41 air injection driver connector.

(c)

Disconnect the A46 air switching valve connector.

(d)

Disconnect the battery positive terminal cable.

CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:

Standard:

Tester Connection

Specified Condition

VV (A41–6) – A46–1

Below 1 

Ω

VV (A41–6) or A46–1 – 

Battery positive terminal cable

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

5

Check voltage between SIV terminal of air injection driver and body ground.

PREPARATION:
(a)

Disconnect the A41 air injection driver connector.

(b)

Turn the ignition switch ON.

CHECK:
Measure the voltage between terminal 3 (SIV) of the air injec-
tion driver connector and body ground.
OK:

Standard:

Tester Connection

Specified Condition

3 (SIV) – Body ground

10 V or more

NG

Go to step 6.

OK

Replace air injection driver.

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

SIV

B17417

E4

AIRV

DI–324

–

DIAGNOSTICS

ENGINE

518

6

Check for open and short in harness and connector between air injection driver
and ECM.

PREPARATION:
(a)

Disconnect the air injection driver connector.

(b)

Disconnect the E4 ECM connector.

CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:

Standard:

Tester Connection

Specified Condition

SIV (A41–3) – AIRV (E4–4)

Below 1 

Ω

SIV (A41–3) or AIRV (E4–4)  – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

Replace ECM (See page 

SF–80

).

A16555

AIR INJ CHECK

AIR PUMP............................ON
EASV   ............................OPEN
ASV1.   .............................OPEN
ASV2...............................OPEN
A/F  BANK1......................19.05
A/F  BANK2........................14.5
PRESSURE....................17 kPa
PULSATION..............25.39 kPa
AI STATUS...........................OK
Remaining Time 05 sec.

Press [EXIT] to quit

–

DIAGNOSTICS

ENGINE

DI–325

519

7

Check air switching valve No.2 operation.

PREPARATION:
(a)

Start the engine and warm it up.

(b)

Turn the ignition switch to OFF.

(c)

Connect the hand–held tester to the DLC3.

(d)

Start the engine and push the hand–held tester main
switch ON.

CHECK:
(a)

Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 5 and 6

HINT:
OPERATION 5: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:CLOSE
OPERATION 6: AP:ON, EASV:OPEN, ASV1:CLOSE,
ASV2:OPEN
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand–held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
(b)

Read value of the A/F BANK1 and BANK2 on the hand–
held tester.

RESULT:

Air switching valve No.2 operation

Air–fuel ratio

Open

18 or more

Close

Approximately 14.5

HINT:

When the ASV No.2 operates normally, the A/F value is 18 or more when the valve is open, and approx-
imately 14.5 when the valve is closed.

Perform the following procedures only on the bank of which the valve is not close.

NEXT

A23646

Port A

DI–326

–

DIAGNOSTICS

ENGINE

520

8

Check VSV for air injection control operation.

PREPARATION:
(a)

Turn the ignition switch OFF.

(b)

Disconnect the vacuum hose from the VSV for air injec-
tion control.

(c)

Connect the hand–held tester to the DLC3.

(d)

Start the engine and turn the tester ON.

CHECK:
(a)

Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1

(b)

At this time, check that no negative pressure generates
at  port A of the VSV.

HINT:
OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand–held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:

No negative pressure is generated.

NG

Go to step 10.

OK