Toyota Sequoia (2005). Manual — part 296

F19775

TL1

TL2

TL3

25

F22

24

F22

23

F22

B–W

B

B–R

B–W

B

B–R

W–B

6

IG1

9

IG1

2

IG1

TL1

TL2

TL3

GND

T4
Transfer Shift Actuator

1

2

3

4

W–B W–B

W–R

W

W–R

W

A

J18
J/C

5

6

F10
Fusible Link Block

ALT

5

4

8

B

B

Engine Room J/B

1

2D

1

2C

AM2

IG

Battery

3

4

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–979

1173

DI–980

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1174

INSPECTION PROCEDURE

1

Check center differential lock operation (See page

TR–39

).

OK:

Center differential lock operation is norm.

NG

Repair or replace one–touch 2–4 selector sys-
tem.

OK

2

Check operation of the center differential lock indicator light.

PREPARATION:
(a)

Turn the ignition switch to the ON position.

(b)

Set the transfer to the L4 position.

CHECK:
Check that pressing the center differential lock switch locks the differential and turns the lock indicator on.
OK:

Indicator light: ON/OFF or OFF/ON

HINT:
When the center differential cannot be shifted to LOCK smoothly, the center differential lock indicator light
will blink.

NG

Repair or replace center differential lock indica-
tor light circuit.

OK

3

Check that the 4WD ECU connectors are securely connected to the 4WD ECU.

NO

Connect the connector to the 4WD ECU.

YES

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–981

1175

4

Check for open and short circuit in harnesses and connectors between termi-
nals CD of the translate ECU and IND of the 4WD control ECU, EXI2 of the trans-
late ECU and detection SW (See page

IN–35

).

NG

Repair or replace harness or connector.

OK

5

Replace the translate ECU and check if the trouble occurs again.

PREPARATION:
(a)

Clear the DTC (See page

DI–911

).

(b)

Turn the ignition switch OFF.

CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:

DTC is output

A

DTC is not output

B

B

END

A

DI–982

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1176

6

Replace skid control ECU and check if the trouble occurs again
(See page

BR–52

and

DI–911

).

PREPARATION:
(a)

Clear the DTC (See page

DI–911

).

(b)

Turn the ignition switch OFF.

CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:

DTC is output

A

DTC is not output

B

B

END

A

Check and replace 4WD control ECU.

NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page

DI–897

).