Toyota Tundra. Manual — part 2942

Blinks (ON: 0.2 seconds,

OFF: 0.2 seconds)

malfunction



During shift position N signal
malfunction



During engine speed signal
malfunction



From 4WD HIGH to 4WD LOW return control completion,
until 4WD control switch is changed to 4H or 2WD



From 3 seconds after 4WD HIGH to 4WD LOW return control
start (shift fork of high-low transfer shift actuator is in neutral
position), until 4WD control switch is changed to 4H or 2WD



From 4WD LOW to 4WD HIGH return control completion,
until 4WD control switch is changed to 4L



From 3 seconds after 4WD LOW to 4WD HIGH return control
start (shift fork of high-low transfer shift actuator is in neutral
position), until 4WD control switch is changed to 4L

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

Fig. 133: Identifying Switch Condition Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking
the suspected areas in the order they are listed. Replace parts as necessary.

Touch select 2-4 and high-low system

TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM PROBLEM SYMPTOMS CHART

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

Symptom

Suspected Area

See

Switch from 2WD to 4WD
HIGH impossible (Only 4HI
indicator light, or 4HI and 4LO
indicator lights blink at 0.2
seconds intervals)

Harness or connector

ON-VEHICLE INSPECTION

Transfer shift actuator

ON-VEHICLE INSPECTION

A.D.D. actuator

ON-VEHICLE INSPECTION

CAN communication system

CAN COMMUNICATION SYSTEM

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

Transfer

INSPECTION

Switch from 4WD HIGH to
4WD LOW impossible (Only
4LO indicator light, or 4HI and
4LO indicator lights blink at 0.2
seconds intervals)

Harness or connector

ON-VEHICLE INSPECTION

Transfer shift actuator

ON-VEHICLE INSPECTION

CAN communication system

CAN COMMUNICATION SYSTEM

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

Transfer

INSPECTION

Switch from 4WD HIGH to
2WD impossible (4HI and 4LO
indicator lights blink at 0.2
seconds intervals)

Harness or connector

ON-VEHICLE INSPECTION

Transfer shift actuator

ON-VEHICLE INSPECTION

A.D.D. actuator

ON-VEHICLE INSPECTION

CAN communication system

CAN COMMUNICATION SYSTEM

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

Transfer

INSPECTION

Switch from 4WD LOW to
4WD HIGH impossible (Only
4LO indicator light, or 4HI and
4LO indicator lights blink at 0.2
seconds intervals)

Harness or connector

ON-VEHICLE INSPECTION

Transfer shift actuator

ON-VEHICLE INSPECTION

CAN communication system

CAN COMMUNICATION SYSTEM

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

Transfer

INSPECTION

4HI indicator light does not
come on

Harness or connector

ON-VEHICLE INSPECTION

4WD fuse

ON-VEHICLE INSPECTION

Combination meter

HOW TO PROCEED WITH

TROUBLESHOOTING

CAN communication system

CAN COMMUNICATION SYSTEM

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

4HI indicator light remains on

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

Combination meter

HOW TO PROCEED WITH

TROUBLESHOOTING

4LO indicator light does not
come on

Combination meter

HOW TO PROCEED WITH

TROUBLESHOOTING

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra

TERMINALS OF ECU

1. CHECK 4WD CONTROL ECU

Fig. 134: Identifying 4WD Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Measure the voltage and resistance according to the value(s) in the table below.

4WD CONTROL ECU TERMINAL DESCRIPTION

4HI indicator light remains on

4WD control switch

ON-VEHICLE INSPECTION

4WD control ECU

TERMINALS OF ECU

Combination meter

HOW TO PROCEED WITH

TROUBLESHOOTING

HINT:
*: Blinking during the return control is not a malfunction.

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

A25-1 (HL1) -

A26-4 (GND)

O - W-B

High-low transfer shift
actuator limit switch

Ignition switch ON 4WD control
switch 4H

Below 1.5

V

Ignition switch ON 4WD control

switch 4L

10.5 to 14 V

A25-2 (HL2) -

A26-4 (GND)

R - W-B

High-low transfer shift
actuator limit switch

Ignition switch ON 4WD control
switch 4H

10.5 to 14 V

Ignition switch ON 4WD control

switch 4L

Below 1.5
V

A25-3 (HL3) -

A26-4 (GND)

GR - W-

B

High-low transfer shift
actuator limit switch

Ignition switch ON 4WD control
switch 4H

10.5 to 14 V

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

10.5 to 14 V

2009 Toyota Tundra

2009 TRANSMISSION JF1A Transfer - Tundra