Nissan Frontier D40. Instruction — part 312
DIFFERENTIAL LOCK SYSTEM
DLN-269
< FUNCTION DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
System Diagram
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System Description
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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-III. Refer to
CONTROL UNIT : CONSULT-III Function (DIFF LOCK)"
.
DIFFERENTIAL LOCK OPERATION
SDIA2500E
SDIA2498E
DLN-270
< FUNCTION DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
DIFFERENTIAL LOCK SYSTEM
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
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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)
Lamp check
Turns ON when ignition switch is turned ON.
Turns OFF after engine start.
AWDIA0313ZZ
DIFFERENTIAL LOCK SYSTEM
DLN-271
< FUNCTION DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
Component Description
INFOID:0000000005275584
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
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.
DLN-272
< FUNCTION DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
DIAGNOSIS SYSTEM (DIFFERENTIAL LOCK CONTROL UNIT)
DIAGNOSIS SYSTEM (DIFFERENTIAL LOCK CONTROL UNIT)
DIFFERENTIAL LOCK CONTROL UNIT
DIFFERENTIAL LOCK CONTROL UNIT : CONSULT-III Function (DIFF LOCK)
INFOID:0000000005275585
CONSULT-III can display each diagnostic item using the following diagnostic test modes
SELF-DIAGNOSTIC RESULTS
Display Item List
Refer to
.
DATA MONITOR
Display Item List
DIFF LOCK
Diagnostic test mode
Function
Self-Diagnostic Result
Displays differential lock control unit self-diagnostic results.
Data Monitor
Displays differential lock control unit input/output data in real time.
CAN Diag Support Monitor
The results of transmit/receive diagnosis of CAN communication can be read.
ECU Identification
The part number of the differential lock control unit can be checked
Monitor item [Unit]
Description
BATTERY VOLT [V]
Displays power supply voltage for the differential lock control unit.
4WD MODE [2H/4H/4Lo]
Displays 4WD shift switch position.
VHCL S/SEN-R [km/h] or [mph]
Displays average of right rear wheel speed sensor. Value is approximately equal to the
indication of vehicle speed on the speedometer (inside
±
10%).
VHCL S/SEN-L [km/h] or [mph]
Displays average of left rear wheel speed sensor. Value is approximately equal to the
indication of vehicle speed on the speedometer (inside
±
10%).
VHCL S/SEN-RL [km/h] or [mph]
Displays average of rear wheel speed sensors (left and right). Value is approximately
equal to the indication of vehicle speed on the speedometer (inside
±
10%).
D-LOCK SW SIG [ON/OFF]
Displays differential lock mode switch position.
D-LOCK SIG [ON/OFF]
Displays control status of differential lock.
RELAY ON [ON/OFF]
Displays operating condition of differential lock solenoid relay (integrated in differential
lock control unit).
RELAY MTR [ON/OFF]
Displays control status of differential lock solenoid relay (integrated in differential dif-
ferential lock control unit).
SOL MTR [ON/OFF]
Displays control status of differential lock solenoid.
IND MTR [ON/OFF]
Displays control status of DIFF LOCK indicator lamp.
D-LOCK POS SW [ON/OFF]
Displays condition of differential lock position switch
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