Toyota Sequoia (2005). Manual - part 133

B17530

Port C

Port B

Port A

Air

B17531

Port C

Port B

Port A

Air

–

DIAGNOSTICS

ENGINE

DI–327

521

9

Check air switching valve No.2 operation.

PREPARATION:
Remove the air switching valve No.2.
CHECK:
Blow air into port B and check that air is not discharged from port
C.
OK:

Not discharged from port C

CHECK:
Apply vacuum 30 kPa (225 mmHg) to port A, blow air into port
B and check that air is discharged from port C.
OK:

Discharged from port C

NG

Replace air switching valve No.2.

OK

Check for intermittent problems
 (See page 

DI–11

).

B17516

Air

Port A

B17517

Air

Port A

DI–328

–

DIAGNOSTICS

ENGINE

522

10

Check VSV for air injection control.

PREPARATION:
Disconnect the connector from the VSV for air injection control.
CHECK:
Check that air does not flow from the port as shown in the il-
lustration.
OK:

Does not flow from port A

CHECK:
Apply battery positive across the terminals, check that air flows
from the ports.
OK:

Flows from port A

NG

Replace VSV for air injection control.

OK

B17412

E8

AIV1

AIV2

B17437

V14

VSV Connector

V15

Wire Harness Side:

–

DIAGNOSTICS

ENGINE

DI–329

523

11

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

PREPARATION:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Disconnect the E8 ECM connector.

(c)

Disconnect the VSV for air injection system control con-
nector.

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 (AIV1) – 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

Replace ECM (See page 

SF–80

).

DI–330

–

DIAGNOSTICS

ENGINE

524

DTC

P1442

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

DTC

P1445

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

DTC

P2441

Secondary Air Injection System Switching
Valve Stuck Close Bank 1

CIRCUIT DESCRIPTION

Refer to DTC P0412 on page 

DI–234

.

DTC No.

DTC Detection Condition

Trouble Area

P1442

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

No pressure change (decrease) after the ECM sends an open

air switching valve No.2 (bank 1) signal.

(2 trip detection logic)

VSV for air injection control circuit (Bank 1)

Vacuum hose (VSV for air injection control – air switching

valve No.2)

Air injector pipe (Air switching valve No.2 – exhaust manifold)

Air switching valve No.2 (Bank 1)

VSV for air injection control (Bank 1)

ECM

P1445

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

No pressure change (decrease) after the ECM sends an open

air switching valve No.2 (bank 2) signal.

(2 trip detection logic)

VSV for air injection control circuit (Bank 2)

Vacuum hose (VSV for air injection control – air switching

valve No.2)

Air injector pipe (Air switching valve No.2 – exhaust manifold)

Air switching valve No.2 (Bank 2)

VSV for air injection control (Bank 2)

ECM

P2441

Air switching valve stuck close:

The pressure sensor does not detect exhaust pulsation when

system operates. (All of air switching valve ON)

This DTC means either of following conditions.

(a) Electromagnetic air switching valve stuck closed.

(b) Both of ”air switching valve No.2 bank 1” and ”air switching

valve No.2 bank 2” stuck closed.

(2 trip detection logic)

Vacuum hoses (Throttle body – VSVs for air injection control)

Air switching valve

Air injector pipe (Air switching valve No.2 – exhaust manifold)

Air injection hose

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

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

Air injection driver

Air injection driver circuit

ECM

MONITOR DESCRIPTION

Refer to DTC P1441, P1444 and P2440 on page 

DI–314

.

DIDMS–01