Toyota Tundra (2015 year). Manual — part 869
Last Modified: 9-16-2014
6.6 U
Doc ID: RM0000030AE00IX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: SYSTEM DIAGRAM; 2015 MY Tundra
[08/2014 - ]
SYSTEM DIAGRAM
WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...
TRANSMITTING ECU
(TRANSMITTER)
RECEIVING ECU
SIGNAL
COMMUNICATION
METHOD
Skid control ECU
4 wheel drive
control ECU
Wheel speed sensor error
signal
Wheel speed signal
Vehicle wheel sensor power
supply decline status signal
Vehicle speed signal
CAN communication
system
WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...
TRANSMITTING ECU
(TRANSMITTER)
RECEIVING ECU
SIGNAL
COMMUNICATION
METHOD
ECM
4 wheel drive
control ECU
Shift position P signal
Shift position N signal
CAN communication
system
4 wheel drive control
ECU
Combination meter
assembly
4WD indicator ON and
flashing request signal
L4 indicator ON and flashing
request signal
Buzzer sound demand signal
CAN communication
system
4 wheel drive control
ECU
Skid control ECU
Motor energizing signal
4WD status signal
L4 status signal
CAN communication
system
4 wheel drive control
ECU
ECM
Cruise control cancel request
signal
4WD status signal
CAN communication
system
WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...
Last Modified: 9-16-2014
6.6 D
Doc ID: RM0000030AD00IX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: SYSTEM DESCRIPTION; 2015 MY
Tundra [08/2014 - ]
SYSTEM DESCRIPTION
1. DESCRIPTION
A part-time 2-speed WF1AM transfer uses a touch select 2-4 and high-low system, enabling the driver
to switch between 2WD, 4H and 4L modes by turning the transfer position switch.
Through these switch signals, the 4 wheel drive control ECU actuates the shift motor in the transfer
shift actuator and another shift motor in the A.D.D. actuator (differential vacuum actuator assembly).
2. DRIVING MODE SWITCHING PATTERN
Text in Illustration
*1
Transfer Position Switch
-
-
3. INDICATOR LIGHT AND WARNING BUZZER OPERATING CONDITIONS
MODE
4HI INDICATOR LIGHT 4LO INDICATOR LIGHT WARNING BUZZER
2WD
Not illuminated
Not illuminated
Not sounding
Switching from 2WD to 4H
Blinking
Not illuminated
Not sounding
2WD to 4L switch request (not permitted)
Blinking
Not illuminated
Sounding
4H
Illuminated
Not illuminated
Not sounding
Switching from 4H to 2WD
Blinking
Not illuminated
Not sounding
Switching from 4H to 4L
Illuminated
Blinking
Not sounding
4H to 4L switch request (not permitted)
Illuminated
Blinking
Sounding
WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...
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