Toyota Tundra. Manual — part 2947

HINT:

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

Fig. 147: Identifying A.D.D. Actuator (Free To Lock Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. After the Free to Lock switch is complete, inspect the A.D.D. detection switch and

limit switch.

Standard resistance

A.D.D. DETECTION SWITCH AND LIMIT SWITCH TESTER CONNECTION
AND SPECIFIED CONDITION

3. Check the Lock to Free switch.

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

3 (ADD) - 4 (GND) After Free to Lock switch is complete

Below 1 ohms

5 (DL2) - 4 (GND) After Free to Lock switch is complete 100 kohms or higher
6 (DL1) - 4 (GND) After Free to Lock switch is complete

Below 1 ohms

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

Fig. 148: Identifying A.D.D. Actuator (Lock To Free Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. After the Lock to Free switch is complete, inspect the A.D.D. detection switch and

limit switch.

Standard resistance

A.D.D. DETECTION SWITCH AND LIMIT SWITCH TESTER CONNECTION
AND SPECIFIED CONDITION

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

7. INSPECT HIGH-LOW TRANSFER SHIFT ACTUATOR

HINT:

Before the inspection, check that the system is switched from 2WD to 4WD normally.

a. Check the harness and connector (ECU - actuator).

1. Disconnect the D68 high-low transfer shift actuator connector.

2. Disconnect the A25 and A26 ECU connector.

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

Tester Connection

Condition

Specified Condition

3 (ADD) - 4 (GND) After Lock to Free switch is complete 100 kohms or higher

5 (DL2) - 4 (GND) After Lock to Free switch Is complete

Below 1 ohms

6 (DL1) - 4 (GND) After Lock to Free switch is complete 100 kohms or higher

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

Fig. 149: Identifying A25, A26 ECU Connector And D68 High-Low Transfer Shift
Actuator Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard resistance

A25, A26 ECU CONNECTOR AND D68 HIGH-LOW TRANSFER SHIFT
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 (high-low transfer shift actuator).

1. Connect the A25 and A26 ECU connectors.

2. Connect the D68 actuator connector.

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

Tester Connection

Condition Specified Condition

A25-1 (HL1) - D68-4 (HL1)

Always

Below 1 ohms

A25-1 (HL1) - Body ground

Always 100 kohms or higher

A25-2 (HL2) - D68-6 (HL2)

Always

Below 1 ohms

A25-2 (HL2) - Body ground

Always 100 kohms or higher

A25-3 (HL3) - D68-5 (HL3)

Always

Below 1 ohms

A25-3 (HL3) - Body ground

Always 100 kohms or higher

A25-16 (NP) - D68-3 (N)

Always

Below 1 ohms

A25-16 (NP) - Body ground

Always 100 kohms or higher

A26-2 (HM1) - D68-1 (HM1) Always

Below 1 ohms

A26-2 (HM1) - Body ground

Always 100 kohms or higher

A26-6 (HM2) - D68-2 (HM2) Always

Below 1 ohms

A26-6 (HM2) - Body ground

Always 100 kohms or higher

D68-7 (GND) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

Fig. 150: Identifying A25 And A26 ECU Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard voltage

A25 AND A26 ECU CONNECTORS TERMINALS TESTER CONNECTION AND
SPECIFIED CONDITION

Tester

Connection

Switch Condition

Specified

Condition

A26-6 (HM2) -
A26-4 (GND)

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

10 to 14 V

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

Below 1.5 V

A26-2 (HM1) -
A26-4 (GND)

Ignition switch ON 4WD control switch 4L --> 4H
(during transfer shift actuator 4WD LOW to 4WD HIGH
operation)

10 to 14 V

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

Below 1.5 V

A25-1 (HL1) -
A26-4 (GND)

Ignition switch ON 4WD control switch 4H position

Below 1.5 V

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

10.5 to 14 V

A25-2 (HL2) -
A26-4 (GND)

Ignition switch ON 4WD control switch 4H position

10.5 to 14 V

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

Below 1.5 V

A25-3 (HL3) -
A26-4 (GND)

Ignition switch ON 4WD control switch 4H position

10.5 to 14 V

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

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra