Toyota Tundra. Manual — part 2943

LOW switching operation

A25-5 (TT) -

A25-25

(TGND)

L - P

Temperature sensor

Ignition switch ON

0 to 5 V

A25-6 (TL1) -

A26-4 (GND)

V - W-B

2WD-4WD transfer
shift actuator limit
switch

Ignition switch ON 4WD control
switch 2WD

Below 1.5

V

Ignition switch ON 4WD control

switch 4H or 4L

10.5 to 14 V

A25-8 (TL3) -

A26-4 (GND)

W - W-B

2WD-4WD transfer
shift actuator limit
switch

Ignition switch ON 4WD control
switch 2WD or 4H

10.5 to 14 V

Ignition switch ON 4WD control

switch 4L

Below 1.5
V

A25-9 (DL1) -

A26-4 (GND)

LG - W-

B

A.D.D. actuator limit
switch

Ignition switch ON 4WD control
switch 2WD (A.D.D. actuator
Free)

10.5 to 14 V

Ignition switch ON 4WD control

switch 4H (A.D.D. actuator Lock)

Below 1.5
V

A25-10 (DL2)

- A26-4

(GND)

R - W-B

A.D.D. actuator limit
switch

Ignition switch ON 4WD control
switch 2WD (A.D.D. actuator
Free)

Below 1.5

V

Ignition switch ON 4WD control

switch 4H (A.D.D. actuator Lock)

10.5 to 14 V

A25-11 (2-4) -

A26-4 (GND)

B - W-B 4WD control switch

Ignition switch ON 4WD control
switch 2WD or 4H

Below 1.5

V

Ignition switch ON 4WD control

switch 4L

10.5 to 14 V

A25-13 (LO) -

A26-4 (GND)

P - W-B 4WD control switch

Ignition switch ON 4WD control
switch 2WD

10.5 to 14 V

Ignition switch ON 4WD control

switch 4H or 4L

Below 1.5
V

A25-14 (4WD)

- A26-4

(GND)

SB - W-

B

2WD-4WD transfer
shift actuator 4WD
detection switch

Ignition switch ON 4WD control
switch 2WD

9.5 to 14 V

Ignition switch ON 4WD control

switch 4H

Below 1.5
V

A25-15 (ADD)

- A26-4

(GND)

W - W-B

A.D.D. actuator
A.D.D. detection
switch

Ignition switch ON 4WD control
switch 2WD

10 to 14 V

Ignition switch ON 4WD control

switch 4H

Below 1.5
V

A25-16 (NP) -

A26-4 (GND)

B - W-B

2WD-4WD transfer
shift actuator neutral
detection switch

Ignition switch ON 1.5 seconds or
less after 4WD HIGH to 4WD
LOW switching operation

Below 1.5

V

Ignition switch ON Over 1.5

seconds after 4WD HIGH to 4WD

LOW switching operation

10 to 14 V

A25-19

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

(CANH) -

A25-20

(CANL)

O - W

CAN communication
line

Ignition switch OFF

54 to 69

ohms

A25-21 (L4) -
A26-4 (GND)

Y - W-B Transfer 4LO signal

Except 4WD control switch 4L

10 to 14 V

Ignition switch ON 4WD control

switch 4L

Below 1.5
V

A26-1 (DM1)

- A26-4

(GND)

W - W-B

A. D. D. actuator
motor

Ignition switch ON 4WD control
switch 4H (During operation of
A.D.D. actuator from Lock to Free)

10 to 14 V

Ignition switch ON 4WD control

switch 4H (A.D.D. actuator Free)

Below 1.5
V

A26-2 (HM1)

- A26-4

(GND)

GR - W-

B

High-low transfer shift
actuator motor

Ignition switch ON 4WD control
switch 4L --> 4H (During
operation of high-low transfer shift
actuator motor from 4WD LOW to
4WD HIGH)

10 to 14 V

Ignition switch ON 4WD control

switch 4L --> 4H (High-low

transfer shift actuator motor

stopped)

Below 1.5
V

A26-3 (IG) -

A26-4 (GND)

V - W-B IG power

Ignition switch ON

11 to 14 V

A26-4 (GND)

- Body ground

W-B -

Body

ground

Ground

Always

Below 1

ohms

A26-5 (DM2)

- A26-4

(GND)

Y - W-B

A. D. D. actuator
motor

Ignition switch ON 4WD control
switch 4H (during operation of
A.D.D. actuator from Free to Lock)

10 to 14 V

Ignition switch ON 4WD control

switch 4H (A.D.D. actuator Lock)

Below 1.5
V

A26-6 (HM2)

- A26-4

(GND)

P - W-B

High-low transfer shift
actuator motor

Ignition switch ON 4WD control
switch 4H --> 4L (During
operation of high-tow transfer shift
actuator motor from 4WD HIGH to
4WD LOW)

10 to 14 V

Ignition switch ON 4WD control

switch 4H --> 4L (High-low

transfer shift actuator motor

stopped)

Below 1.5
V

A26-7 (TM2) -

A26-4 (GND)

LG - W-

B

2WD-4WD transfer
shift actuator motor

Ignition switch ON 4WD control
switch 4H --> 2WD (During
operation of 2WD-4WD transfer
shift actuator motor from 4WD
HIGH to 2WD)

10 to 14 V

Ignition switch ON 4WD control
switch 4H --> 2WD (2WD-4WD Below 1.5

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

FAIL-SAFE CHART

FAIL-SAFE CHART

transfer shift actuator motor

stopped)

V

A26-8 (TM1) -

A26-4 (GND)

R - W-B

2WD-4WD transfer
shift actuator motor

Ignition switch ON 4WD control
switch 2WD --> 4H (During
operation of 2WD-4WD transfer
shift actuator motor from 2WD to
4WD HIGH)

10 to 14 V

Ignition switch ON 4WD control
switch 2WD --> 4H (2WD-4WD

transfer shift actuator motor

stopped)

Below 1.5
V

Malfunction Item

Fail-safe Operation

Indicator light

Fail-safe Deactivation

Conditions

4WD control ECU
malfunction



2WD to 4WD HIGH
switching is not
possible



4WD HIGH to 4WD
LOW switching is not
possible

4HI indicator light
and/or 4LO indicator
light blink at 0.2
seconds intervals

Ignition switch OFF

Wheel speed signal
malfunction*1, *2



2WD to 4WD HIGH
switching is not
possible



4WD HIGH to 4WD
LOW switching is not
possible

4HI indicator light
and/or 4LO indicator
light blink at 0.2
seconds intervals



When signal
returns to normal



During 2WD
switching
operation



Ignition switch
OFF

A/T shift position signal
malfunction

4WD HIGH to 4WD LOW
switching is not possible

4LO indicator light
blinks at 0.2 seconds
intervals



When signal
returns to normal



During 2WD or
4WD HIGH
switching
operation



Ignition switch
OFF

Engine speed signal
malfunction

4WD HIGH to 4WD LOW
switching is not possible

A.D.D. actuator limit
switch malfunction



2WD to 4WD HIGH
switching is not
possible



4WD HIGH to 4WD
LOW switching is not
possible

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

ON-VEHICLE INSPECTION

1. INSPECT INDICATOR LIGHT

a. 4HI Indicator Light:

1. Turn the ignition switch ON.

2. Change the 4WD control switch from 2WD to 4H.

3. Check the 4HI indicator light.

OK

INDICATOR LIGHT SPECIFIED CONDITION CHART



During cruise control
AUTO driving, cruise
control system is turned
OFF

4HI indicator light
blinks at 0.2 seconds
intervals

Ignition switch OFF

2WD-4WD transfer
shift actuator limit
switch malfunction



2WD to 4WD HIGH
switching is not
possible



4WD HIGH to 4WD
LOW switching is not
possible



During cruise control
AUTO driving, cruise
control system is turned
OFF

High-low transfer shift
actuator limit switch
malfunction



2WD to 4WD HIGH
switching is not
possible



4WD HIGH to 4WD
LOW switching is not
possible

4LO indicator light
blinks at 0.2 seconds
intervals

HINT:



*1: When only 1 wheel's speed sensor is malfunctioning, the switching operation is performed
based on the other 3 wheels. If the switch position and actuator match, fail-safe is deactivated.



*2: When 2 wheels or more are malfunctioning, switching is not possible. If the speed sensor
returns to normal, the fail-safe is deactivated.



When the switching operation is performed during cruise control AUTO driving, if the switch
completion does not occur 5 seconds after the switching operation, the cruise control system is
turned off.

Switch

Condition

Specified Condition

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra