Nissan Frontier. Instruction — part 342
DLN-270
< SYSTEM DESCRIPTION >
[REAR FINAL DRIVE: M226 (ELD) ]
DIFFERENTIAL LOCK SYSTEM
System Diagram
INFOID:0000000009479813
System Description
INFOID:0000000009479814
The differential lock system consists of the following components
• Differential lock control unit
• Differential lock mode switch
• Differential lock position switch
• Differential lock solenoid
• ABS actuator and electric unit (control unit)
• Transfer control unit
DIFFERENTIAL LOCK SYSTEM OPERATION
When the differential lock mode switch is in the LOCK position, a signal is sent to the differential lock control
unit. The differential lock control unit monitors input from the ABS actuator and electric unit (vehicle speed and
VDC operation) and the transfer control unit (4WD shift switch). If conditions are set, the differential lock con-
trol unit provides power and ground to the differential lock solenoid to lock the differential. The differential lock
position switch provides feedback to the differential lock control unit as to whether the lock is engaged based
on pressure plate position. The differential lock control unit provides ground to the DIFF LOCK indicator lamp
to activate the lamp. Refer to the Owner’s Instruction for differential lock system operating instructions.
As a fail-safe function, the differential lock disengages when a malfunction is detected in the differential lock
system. Self-diagnostics can be performed using CONSULT. Refer to
DLN-273, "DIFFERENTIAL LOCK CON-
TROL UNIT : CONSULT Function (DIFF LOCK)"
.
DIFFERENTIAL LOCK OPERATION
SDIA2500E
SDIA2498E
DIFFERENTIAL LOCK SYSTEM
DLN-271
< SYSTEM DESCRIPTION >
[REAR FINAL DRIVE: M226 (ELD) ]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
1. Differential lock solenoid operates pressure plate.
2. Pressure plate presses cam ring.
3. Engage cam ring and side gear, and the differential is locked.
DIFFERENTIAL LOCK INDICATOR LAMP OPERATION
NOTE:
The differential lock standby condition is the time where the differential lock mode switch is in the LOCK posi-
tion and the differential is unlocked.
Component Parts Location
INFOID:0000000009479815
Condition
DIFF LOCK indicator lamp
Differential lock/unlock
ON/OFF
Differential lock standby condition
Flashing once every 2 seconds
Differential lock system malfunction
OFF (even if differential lock mode switch is in LOCK position)
1.
Combination meter M24
2.
Differential lock mode switch M149
3.
Differential lock control unit M70
(view with lower instrument panel LH
removed)
4.
Steering column
5.
Differential lock position switch C116 6.
Differential lock solenoid C117
AWDIA0313ZZ
DLN-272
< SYSTEM DESCRIPTION >
[REAR FINAL DRIVE: M226 (ELD) ]
DIFFERENTIAL LOCK SYSTEM
Component Description
INFOID:0000000009479816
Component
Function
Differential lock control unit
• Controls differential lock solenoid to lock/unlock the differential.
• As a fail-safe function, the differential lock disengages when a malfunction is detected
within the differential lock system.
Differential lock solenoid
Controls pressure plate operation when provided power and ground from the differential
lock control unit.
Differential lock position switch
Detects differential lock/unlock condition based on the position of the pressure plate.
Differential lock mode switch
Allows driver input for differential LOCK/UNLOCK to the differential lock control unit.
DIFF LOCK indicator lamp
Illuminates to indicate the differential lock is locked or in standby condition.
ABS actuator and electric unit (control unit)
Transmits the following signals via CAN communication to the differential lock control
unit.
• Vehicle speed signal
• VDC operation signal (A/T models)
Transfer control unit (with 4-wheel drive)
Transmits the 4WD shift switch signal via CAN communication to the differential lock
control unit.
DIAGNOSIS SYSTEM (DIFFERENTIAL LOCK CONTROL UNIT)
DLN-273
< SYSTEM DESCRIPTION >
[REAR FINAL DRIVE: M226 (ELD) ]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
DIAGNOSIS SYSTEM (DIFFERENTIAL LOCK CONTROL UNIT)
DIFFERENTIAL LOCK CONTROL UNIT
DIFFERENTIAL LOCK CONTROL UNIT : CONSULT Function (DIFF LOCK)
INFOID:0000000009479817
APPLICATION ITEM
CONSULT performs the following functions via DDL2 communication with differentail lock control unit.
SELF DIAGNOSTIC RESULT
.
DATA MONITOR
Direct Diagnostic Mode
Description
Ecu Identification
The differential lock control unit part number is displayed.
Self Diagnostic Result
The differential lock control unit self diagnostic results are displayed.
Data Monitor
The differential lock control unit input/output data is displayed in real time.
CAN Diag Support Mntr
The result of transmit/receive diagnosis of CAN communication is displayed.
Monitor Item [Unit]
ECU
INPUT
SIGNALS
MAIN
SIGNALS
Description
BATTERY VOLT [V]
x
x
Indicates voltage supply to differential lock control unit.
4WD MODE [2H/4H/4Lo]
x
x
Indicates condition of 4WD shift switch signal received from transfer con-
trol unit on CAN communication line.
VHCL S/SEN-R [km/h] or [mph]
x
–
Indicates right rear wheel speed signal received from ABS actuator and
electric unit (control unit) on CAN communication line (approx. vehicle
speed).
VHCL S/SEN-L [km/h] or [mph]
x
–
Indicates left rear wheel speed signal received from ABS actuator and
electric unit (control unit) on CAN communication line (approx. vehicle
speed).
VHCL S/SEN-RL [km/h] or [mph]
x
x
Indicates average of rear wheel speed signal (left and right) received from
ABS actuator and electric unit (control unit) on CAN communication line.
D-LOCK SW SIG [On/Off]
x
x
Indicates condition of differential lock mode switch.
D-LOCK SIG [On/Off]
x
x
Indicates condition of differential lock.
RELAY ON [On/Off]
x
x
Indicates operating condition of differential lock solenoid relay (integrated
in differential lock control unit).
RELAY MTR [On/Off]
x
x
Indicates control status of differential lock solenoid relay (integrated in dif-
ferential lock control unit).
SOL MTR [On/Off]
x
x
Indicates condition of differential lock solenoid.
IND MTR [On/Off]
x
x
Indicates condition of DIFF LOCK indicator lamp.
D-LOCK POS SW [On/Off]
x
x
Indicates condition of differential lock position switch
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