Nissan Titan. Manual — part 109
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< BASIC INSPECTION >
[TRANSFER: TX15B]
DIAGNOSIS AND REPAIR WORKFLOW
>> GO TO 4
4.
SYMPTOM
Check for symptoms. Refer to
>> GO TO 5
5.
MALFUNCTIONING PARTS
Repair or replace the applicable parts.
>> GO TO 6
6.
SYSTEM OPERATION
Check system operation.
>> GO TO 7
7.
SELF-DIAGNOSIS
Perform self-diagnosis.
Are any DTCs displayed?
YES
>> GO TO 5
NO
>> Inspection End
4WD SYSTEM
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< SYSTEM DESCRIPTION >
[TRANSFER: TX15B]
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SYSTEM DESCRIPTION
4WD SYSTEM
System Diagram
INFOID:0000000009885949
COMPONENT DESCRIPTION
ALDIA0398GB
Components
Function
Transfer control unit
Controls transfer control device and controls shifts between 2WD/4WD and 4H/4LO.
Transfer control device
Integrates actuator motor and actuator position switch.
Actuator motor
Moves shift rods when signaled by transfer control unit.
Actuator position switch
Detects actuator motor position.
Wait detection switch
Detects if transfer case is in 4WD.
4LO switch
Detects if transfer case is in 4LO.
ATP switch
Detects if transfer case is in neutral.
4WD shift switch
Allows driver to select from 2WD/4WD and 4H/4LO.
ABS actuator and electric unit
(control unit)
Transmits the following signals via CAN communication to transfer control unit.
• Vehicle speed signal
• Stop lamp switch signal (brake signal)
TCM
Transmits the following signal via CAN communication to transfer control unit.
• Output shaft revolution signal
• A/T position indicator signal (transmission range switch signal)
ECM
Transmits engine speed signal via CAN communication to transfer control unit.
Combination meter
Receives the following signals via CAN communication from transfer control unit.
• 4WD warning lamp signal
• ATP warning lamp signal
• 4WD shift indicator signal
• 4LO indicator signal
DLN-10
< SYSTEM DESCRIPTION >
[TRANSFER: TX15B]
4WD SYSTEM
System Description
INFOID:0000000009885950
TRANSFER CONTROL DEVICE
Integrates actuator motor and actuator position switch.
Actuator Motor
Moves shift rods when signaled by transfer control unit.
Actuator Position Switch
Detects actuator motor position and then sends signal to transfer control unit.
WAIT DETECTION SWITCH
Detects if transfer case is in 4WD by the 2-4 shift fork position.
NOTE:
If 4WD shift switch is switched to 4H or 4LO and the transfer case is not in 4WD completely, the wait detection
system will operate.
4LO SWITCH
4LO switch detects if the transfer case is in 4LO by the position of the L-H shift fork.
ATP SWITCH
ATP switch detects if transfer case is in neutral by the position of the L-H shift fork.
NOTE:
Transfer case may be in neutral when shifting between 4H-4LO.
TRANSFER CONTROL UNIT
• Transfer control unit controls transfer control device and it directs shifts from 4H-4LO and 2WD-4WD.
• Self-diagnosis can be done.
TRANSFER SHIFT HIGH AND LOW RELAYS
Transfer shift high and low relays apply power supply to transfer control device.
TRANSFER SHUT OFF RELAYS
Transfer shut off relays 1 and 2 apply power supply to transfer control unit.
4WD SHIFT SWITCH AND INDICATOR LAMP
4WD Shift Switch
4WD shift switch is able to select from 2WD, 4H or 4LO.
4WD Shift Indicator Lamp
• Displays driving conditions selected by the 4WD shift switch while engine is running. When the 4WD warning
lamp is turned on, all 4WD shift indicator lamps will turn off.
• Turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately for 1 sec-
ond after the engine starts if system is normal.
WDIA0138E
4WD SYSTEM
DLN-11
< SYSTEM DESCRIPTION >
[TRANSFER: TX15B]
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4LO Indicator Lamp
• Displays 4LO while engine is running. 4LO indicator lamp flashes if transfer gear does not shift completely
into 4H
⇔4LO. In this condition, the transfer case may be in neutral and the A/T parking mechanism may not
operate.
• Turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately for 1 sec-
ond after the engine starts if system is normal.
4WD WARNING LAMP
Turns on or flashes when there is a malfunction in 4WD system.
Also turns on when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately for 1
second after the engine starts if system is normal.
4WD Warning Lamp Indication
ATP WARNING LAMP
When the A/T selector lever is in P position, the vehicle may move if the transfer case is in neutral. ATP warn-
ing lamp is turned on to indicate this condition to the driver.
Condition
4WD warning lamp
System normal
OFF
Lamp check
Turns ON when ignition switch is turned ON.
Turns OFF after engine start.
4WD system malfunction
ON
During self-diagnosis
Flashes malfunction mode.
Large difference in diameter of front/
rear tires
Flashes slow (1 flash / 2 seconds)
(Continues to flash until the ignition switch is turned OFF)
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