Toyota Sequoia (2005). Manual - part 129

A23564

Engine Room J/B

EFI Relay

2

1

EFI No.2

EFI No.1

3

5

2A

2

J5
J/C

A

ED

W–B

1

2F

Battery

B

F10
FL Block

4

5

B

2D

1

2H

6

E4

B–W

IA4

B–W

8

MREL

14

P–L

L–B

E8

E8

27

26

AIV2

AIV1

V14
VSV for Air Injection Control
(Bank 1)

V12
VSV for Air Injection Control
(Bank 2)

G–R

G–R

G–R

G–R

IG4

22

J/C J16

B

B

G–R

IA4

4

G–R

A

A

J/C J2

G–R

ECM

–

DIAGNOSTICS

ENGINE

DI–311

505

WIRING DIAGRAM

B17440

V14

V15

Wire Harness Side:

VSV for Air Injection
Control Connector

B17412

E8

AIV1

AIV2

B17440

V14

V15

Wire Harness Side:

VSV for Air Injection
Control Connector

DI–312

–

DIAGNOSTICS

ENGINE

506

INSPECTION PROCEDURE

1

Check VSV for air injection control power source.

PREPARATION:
(a)

Disconnect the VSV for air injection control connector.

(b)

Turn the ignition switch ON.

CHECK:
Measure the voltage between the terminal 1 of the VSV con-
nector and body ground.
OK:

Standard: 9 V or more

NG

Check and replace harness and connector.

OK

2

Check for open and short circuit in harness and connector between ECM and
VSV for air injection control

PREPARATION:
(a)

Disconnect the E8 ECM connector.

(b)

Disconnect the VSV for air injection control connector.

CHECK:
Measure the resistance between the VSV connector and ECM.
OK:

Standard:

Tester connection

Specified condition

E8–27 (AIV1) – V14–2

Below 1  

Ω

E8–26 (AIV2) – V15–2

Below 1  

Ω

CHECK:
Measure the resistance between the VSV connector and body
ground.
OK:

Standard:

Tester connection

Specified condition

E8–27 (AIV1) or V14–2 and Body

ground

10 K

Ω

 or higher

E8–26 (AIV1) or V15–2 and Body

ground

10 K

Ω

 or higher

NG

Repair or replace harness or connector.

OK

B17515

–

DIAGNOSTICS

ENGINE

DI–313

507

3

Check resistance of VSV for air injection control.

PREPARATION:
(a)

Disconnect the connector from the VSV.

(b)

Disconnect the 2 vacuum hoses from the VSV.

CHECK:
Measure the resistance between the VSV terminals.
OK:

Standard:

Tester Connection

Specified Condition

1 – 2

33 to 39 

Ω

 at 20

°

C (68

°

F)

1 – Body ground

10 k

Ω

 or higher

2 – Body ground

10 k

Ω

 or higher

NG

Replace VSV for air injection control.

OK

Replace ECM. (See page 

SF–80

)

DI–314

–

DIAGNOSTICS

ENGINE

508

DTC

P1441

Secondary Air Injection System Switching
Valve No.2 Stuck Open Bank 1

DTC

P1444

Secondary Air Injection System Switching
Valve No.2 Stuck Open Bank 2

DTC

P2440

Secondary Air Injection System Switching
Valve Stuck Open Bank 1

CIRCUIT DESCRIPTION

Refer to DTC P0412 on page 

DI–234

.

DTC No.

DTC Detection Condition

Trouble Area

P1441

Air switching valve No.2 (bank 1) stuck open:

The pressure sensor detects exhaust pulsation, when both of

air switching valve No.2 are OFF (and air switching valve ON).

(2 trip detection logic)

VSV for air injection control circuit (Bank 1)

Air switching valve No.2 (Bank 1)

VSV for air injection system (Bank 1)

ECM

P1444

Air switching valve No.2 (bank 2) stuck open:

The pressure sensor detects exhaust pulsation, when both of

air switching valve No.2 are OFF (and air switching valve ON).

(2 trip detection logic)

VSV for air injection control circuit (Bank 2)

Air switching valve No.2 (Bank 2)

VSV for air injection system (Bank 2)

ECM

P2440

Air switching valve stuck open:

The pressure sensor detects exhaust pulsation when the sys-

tem does not operate (both of air switching valve No.2 OFF,

and air switching valve OFF and air pump OFF).

This DTC means open stuck of air switching valve and ”air

switching valve No.2 (bank 1 or bank 2)”

(1 trip detection logic)

Air switching valve

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection system (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM

DIDMR–01