Toyota Tundra. Manual — part 2945

Fig. 139: Identifying A25, A26 ECU Connectors And D67 Actuator Connector
Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard resistance

A25, A26 ECU CONNECTORS AND D67 ACTUATOR CONNECTOR TERMINALS
TESTER CONNECTION AND SPECIFIED CONDITION

If there is a malfunction, repair or replace harness or connector. If the harness or connector is
normal, check the ECU output voltage.

b. Check the 4WD control ECU (2WD-4WD transfer shift actuator).

1. Connect the A25 and A26 ECU connectors.

2. Connect the D67 actuator connector.

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

Standard voltage

Tester Connection

Condition

Specified Condition

A25-6 (TL1) - D67-4 (TL1)

Always

Below 1 ohms

A25-6 (TL1) - Body ground

Always

10 kohms or higher

A25-8 (TL3) - D67-5 (TL3)

Always

Below 1 ohms

A25-8 (TL3) - Body ground

Always

10 kohms or higher

A25-14 (4WD) - D67-3
(CDL)

Always

Below 1 ohms

A25-14 (4WD) - Body ground

Always

10 kohms or higher

A26-7 (TM2) - D67-2 (TM2)

Always

Below 1 ohms

A26-7 (TM2) - Body ground

Always

10 kohms or higher

A26-8 (TM1) - D67-1 (TM1)

Always

Below 1 ohms

A26-8 (TM1) - Body ground

Always

10 kohms or higher

D67-7 (GND) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

Fig. 140: Identifying A25 And A26 ECU Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

A25 AND A26 ECU CONNECTORS TERMINALS TESTER CONNECTION AND
SPECIFIED CONDITION

If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side
by disconnecting the connector of the 2WD-4WD transfer shift actuator, and then checking

Tester

Connection

Switch Condition

Specified

Condition

A26-8 (TM1) -
A26-4 (GND)

Ignition switch ON 4WD control switch 2WD --> 4H
position (during transfer shift actuator 2WD to 4WD
HIGH switching operation)

10 to 14 V

Ignition switch ON 4WD control switch 2WD --> 4H
position (transfer shift actuator 2WD to 4WD HIGH
switching operation stopped)

Below 1.5 V

A26-7 (TM2) -
A26-4 (GND)

Ignition switch ON 4WD control switch 4H --> 2WD
position (during transfer shift actuator 4WD HIGH to
2WD switching operation)

10 to 14 V

Ignition switch ON 4WD control switch 4H --> 2WD
position (transfer shift actuator 4WD HIGH to 2WD
switching operation stopped)

Below 1.5 V

A25-6 (TL1) -
A26-4 (GND)

Ignition switch ON 4WD control switch 2WD position

Below 1.5 V

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

10.5 to 14 V

A25-8 (TL3) -
A26-4 (GND)

Ignition switch ON 4WD control switch 2WD position

11 to 14 V

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

Below 1.5 V

A25-14 (4WD) -
A26-4 (GND)

Ignition switch ON 4WD control switch 2WD position

9.5 to 14 V

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

Below 1.5 V

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

the ECU output voltage.

c. Check the 4WD control ECU.

1. Disconnect the D67 actuator connector.

2. Connect the A25 and A26 ECU connectors.

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

Standard voltage

D67 ACTUATOR CONNECTOR TESTER CONNECTION AND SPECIFIED
CONDITION VOLTAGE

Fig. 141: Identifying D67 Actuator Connector Terminals
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 2WD-4WD transfer shift actuator, as the voltage applied to the motor
cannot be measured.

d. Inspect the 2WD-4WD transfer shift actuator.

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

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

then check that the actuator fork moves from the 2WD to 4WD HIGH position.

Tester Connection

Switch Condition

Specified Condition

D67-3 (CDL) - D67-7 (GND)

Ignition switch ON

9.5 to 14 V

D67-4 (TL1) - D67-7 (GND)

Ignition switch ON

10.5 to 14 V

D67-5 (TL3) - D67-7 (GND)

Ignition switch ON

10.5 to 14 V

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

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

HINT:

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

Fig. 142: Identifying 2WD-4WD Transfer Shift Actuator Circuit Diagram (2WD To
4WD HIGH Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. After the 2WD to 4WD HIGH switch is complete, inspect the 4WD detection switch

and limit switch.

Standard resistance

2WD TO 4WD HIGH SWITCH TESTER CONNECTION AND SPECIFIED
CONDITION

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

then check that the actuator fork moves from the 4WD HIGH to 2WD position.

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

3 (4WD) - 7

(GND)

After 2WD to 4WD HIGH switch is
complete

Below 1 ohms

4 (TL1) - 7 (GND)

After 2WD to 4WD HIGH switch is
complete

100 kohms or higher

5 (TL3) - 7 (GND)

After 2WD to 4WD HIGH switch is
complete

Below 1 ohms

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra