Toyota Tundra. Manual — part 2948

If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side
by disconnecting the connector of the high-low transfer shift actuator, and then checking the
ECU output voltage.

c. Check the 4WD control ECU.

1. Connect the A25 and A26 ECU connectors.

2. Disconnect the D68 actuator connector.

3. Measure the voltage according to the value(s) in the table below.

Standard voltage

D68 ACTUATOR TESTER CONNECTION AND SPECIFIED CONDITION

Fig. 151: Identifying D68 Actuator Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

If there is a malfunction, replace the 4WD control ECU (see REMOVAL ). If the voltage is
normal, inspect the high-low transfer shift actuator, as the voltage applied to the motor
cannot be measured.

switch is changed from 4H to 4L

10.5 to 14 V

A25-16 (NP) -
A26-4 (GND)

Ignition switch ON 1.5 seconds or less after 4WD control
switch is changed from 4H to 4L

Below 1.5 V

Ignition switch ON Over 1.5 seconds after 4WD control
switch is changed from 4H to 4L

10 to 14 V

Tester Connection

Switch Condition Specified Condition

D68-3 (N) - D68-7 (GND)

Ignition switch ON

10 to 14 V

D68-4 (HL1) - D68-7 (GND) Ignition switch ON

10.5 to 14 V

D68-5 (HL3) - D68-7 (GND) Ignition switch ON

10.5 to 14 V

D68-6 (HL2) - D68-7 (GND) Ignition switch ON

10.5 to 14 V

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

d. Inspect the high-low transfer shift actuator.

1. Remove the transfer shift actuator (see REMOVAL ).

2. Check the 4WD HIGH to 4WD LOW switch. Connect lines via a relay as shown in the

illustration, then check that the actuator fork moves from the 4WD HIGH to 4WD LOW
position.

HINT:

When inspecting the operation described above, use the stop light control relay (BRK NO.
1).

Fig. 152: Identifying High-Low Transfer Shift Actuator Circuit Diagram (4WD HIGH
To 4WD LOW Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. After the 4WD HIGH to 4WD LOW switch is complete, inspect the neutral detection

switch and limit switch.

Standard resistance

4WD HIGH TO 4WD LOW SWITCH TESTER CONNECTION AND
SPECIFIED CONDITION

NOTE:



Make sure to perform this inspection with the actuator
removed from the vehicle. If this inspection is performed
with the actuator installed to the vehicle, the actuator will
be damaged.



When inspecting the actuator, make sure to operate it with
the lines connected via a relay. If the lines are not
connected via a relay and battery voltage is directly
applied to the actuator, the actuator will be damaged.

Tester

Connection

Condition

Specified

Condition

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

3. Check the 4WD LOW to 4WD HIGH switch. Connect lines via a relay as shown in the

illustration, then check that the actuator fork moves from the 4WD LOW to 4WD HIGH
position.

Fig. 153: Identifying High-Low Transfer Shift Actuator Circuit Diagram (4WD LOW
To 4WD HIGH Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. After the 4WD LOW to 4WD HIGH switch is complete, inspect the neutral detection

switch and limit switch.

Standard resistance

4WD LOW TO 4WD HIGH SWITCH TESTER CONNECTION AND
SPECIFIED CONDITION

3 (N) - 7 (GND)

After 4WD HIGH to 4WD LOW switch is
complete

100 kohms or

higher

4 (HL1) - 7

(GND)

After 4WD HIGH to 4WD LOW switch is
complete

100 kohms or

higher

5 (HL3) - 7

(GND)

After 4WD HIGH to 4WD LOW switch is
complete

100 kohms or

higher

6 (HL2) - 7

(GND)

After 4WD HIGH to 4WD LOW switch is
complete

Below 1 ohms

Tester

Connection

Condition

Specified

Condition

3 (N) - 7 (GND)

After 4WD LOW to 4WD HIGH switch is
complete

100 kohms or

higher

4 (HL1) - 7

(GND)

After 4WD LOW to 4WD HIGH switch is
complete

Below 1 ohms

5 (HL3) - 7

(GND)

After 4WD LOW to 4WD HIGH switch is
complete

100 kohms or

higher

6 (HL2) - 7

After 4WD LOW to 4WD HIGH switch is

100 kohms or

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

If there is a malfunction, replace the transfer shift actuator (see REMOVAL ). If the
transfer shift actuator is normal, replace the 4WD control ECU (see REMOVAL ).

4WD CONTROL SWITCH

COMPONENTS

Fig. 154: Identifying 4WD Control Switch Components

(GND)

complete

higher

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra