Toyota Tundra. Manual — part 2940

2. 4WD HIGH to 4WD LOW switching violation control (if violation occurs before high-

low transfer shift actuator motor operation has started)

4WD HIGH TO 4WD LOW SWITCHING VIOLATION CONTROL

3. ACTUATOR LOW IS DETECTED

Result

ACTUATOR LOW RESULT REFERENCE

HINT:

After 4WD control switch operation, if ACTUATOR LOW is not detected even after 3 seconds
have passed, the 4WD HIGH to 4WD LOW return control is performed.

B: Go to step 5

A: Go to next step.

4. 4LO INDICATOR LIGHT TURNS ON

a. The 4LO indicator light turns on when the 4WD HIGH to 4WD LOW switch is complete.

NEXT: END

Control



Warning buzzer sounds at 0.5 seconds intervals



Actuator fork is in neutral position (driving is impossible)

Release of
Control

Vehicle speed is less than 5 km/h (3 mph) and shift lever is on N (after
release of control, warning buzzer stops and 4LO indicator light blinks at
0.5 seconds intervals until 4WD LOW switch completion)

Control



4LO indicator light blinks at 0.5 seconds intervals



Warning buzzer sounds at 0.5 seconds intervals



Motor operation prohibited

Release
of
Control

Vehicle speed is less than 5 km/h (3 mph) and
shift lever is on N (after release of control,
warning buzzer stops and 4LO indicator light
blinks at 0.5 seconds intervals until 4WD
LOW switch completion)

4WD control switch is
changed to 4H or 2WD
(switching operation occurs
depending on switch
position)

Condition

Proceed

to

After 4WD control switch operation, ACTUATOR LOW detection occurs within 3
seconds

A

After 4WD control switch operation, ACTUATOR LOW detection does not occur even
after 3 seconds have passed

B

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

5. 4WD LOW TO 4WD HIGH RETURN CONTROL IS PERFORMED

a. 4WD LOW to 4WD HIGH return control

4WD LOW TO 4WD HIGH RETURN CONTROL

HINT:

The 4WD LOW to 4WD HIGH switching violation control operates when all of the
following conditions are met during 4WD LOW to 4WD HIGH return control: 1) the vehicle
speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

NEXT: END

5. 4WD LOW TO 4WD HIGH SWITCHING CONTROL (Pattern D)

1. CHANGE 4WD CONTROL SWITCH FROM 4L TO 4H

2. HIGH-LOW TRANSFER SHIFT ACTUATOR MOTOR IS OPERATED

a. The high-low transfer shift actuator motor operates when all of the following conditions are

met: 1) the vehicle speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

HINT:

When the conditions are not met, the 4WD LOW to 4WD HIGH switching violation control
operates.

1. 4WD LOW to 4WD HIGH switching violation control (if violation occurs after high-

low transfer shift actuator motor operation has started)

4WD LOW TO 4WD HIGH SWITCHING VIOLATION CONTROL

Control



4LO indicator light blinks at 0.5 seconds intervals



4WD LOW side operation is stopped, and operation is switched to
4WD HIGH side

Release of
Control

When 4WD HIGH switch completed

NOTE:



When the return control is completed, the 4WD control
switch is in the 4L position but the vehicle is in the 4WD
HIGH state, and this inconsistency causes the 4LO
indicator light to blink at 0.2 seconds intervals. Changing
the 4WD control switch to the 4H position stops the
blinking. (The 4HI indicator light remains illuminated.)



When the 4LO indicator light blinks at 0.2 seconds
intervals, the system is malfunctioning. Refer to the
PROBLEM SYMPTOMS TABLE .



4LO indicator light blinks at 0.5 seconds intervals

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

2. 4WD LOW to 4WD HIGH switching violation control (if violation occurs before high-

low transfer shift actuator motor operation has started)

4WD LOW TO 4WD HIGH SWITCHING VIOLATION CONTROL

3. ACTUATOR HIGH IS DETECTED

Result

ACTUATOR HIGH RESULT REFERENCE

HINT:

After 4WD control switch operation, if ACTUATOR HIGH is not detected even after 3 seconds
have passed, the 4WD LOW to 4WD HIGH return control is performed.

B: Go to step 5

A: Go to next step.

4. 4HI INDICATOR LIGHT ILLUMINATES

a. The 4HI indicator light illuminates when the 4WD LOW to 4WD HIGH switch is complete.

NEXT: END

Control



Warning buzzer sounds at 0.5 seconds intervals



Actuator fork is in neutral position (driving is impossible)

Release of
Control

Vehicle speed is less than 5 km/h (3 mph) and shift lever is on N (after
release of control, warning buzzer stops and 4LO indicator light blinks at
0.5 seconds intervals until 4WD HIGH switch completion)

Control



4LO indicator light blinks at 0.5 seconds intervals



Warning buzzer sounds at 0.5 seconds intervals



Motor operation prohibited

Release
of
Control

Vehicle speed is less than 5 km/h (3 mph) and
shift lever is on N (after release of control,
warning buzzer stops and 4LO indicator light
blinks at 0.5 seconds intervals until 4WD HIGH
switch completion)

4WD control switch is
changed to 4L (switching
operation occurs
depending on switch
position)

Condition

Proceed

to

After 4WD control switch operation, ACTUATOR HIGH detection occurs within 3
seconds

A

After 4WD control switch operation, ACTUATOR HIGH detection does not occur
even after 3 seconds have passed

B

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

5. 4WD HIGH TO 4WD LOW RETURN CONTROL IS PERFORMED

a. 4WD HIGH to 4WD LOW return control

4WD HIGH TO 4WD LOW RETURN CONTROL

HINT:

The 4WD HIGH to 4WD LOW switching violation control operates when all of the
following conditions are met during 4WD HIGH to 4WD LOW return control: 1) the vehicle
speed is less than 5 km/h (3 mph); 2) the shift lever is on N.

NEXT: END

6. 4WD LOW TO 2WD SWITCHING CONTROL (Pattern E)

HINT:

The switching operation occurs in the following order: 1) 4WD LOW to 4WD HIGH switching control;
2) 4WD HIGH to 2WD switching control.

7. INDICATOR LIGHT

a. 4HI Indicator Light

4HI INDICATOR LIGHT CONDITION

Control



4LO Indicator light blinks at 0.5 seconds intervals



4WD HIGH side operation is stopped, and operation is switched to
4WD LOW side

Release of
Control



When 4WD LOW switch completed

NOTE:



When the return control is completed, the 4WD control
switch is in the 4H position but the vehicle is in the 4WD
LOW state, and this inconsistency causes the 4LO
indicator light to blink at 0.2 seconds intervals. Changing
the 4WD control switch to the 4L position stops the
blinking of the 4LO indicator light and causes it to
illuminate.



When the 4LO indicator light blinks at 0.2 seconds
intervals, the system is malfunctioning. Refer to the
PROBLEM SYMPTOMS TABLE .

Indicator Condition

Vehicle Condition

Details [Terminal Name: Switch Condition]



2WD-4WD transfer shift actuator limit
switch 4WD [TL1: OFF, TL3: ON]



2WD-4WD transfer shift actuator 4WD

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra