differential NISSAN NAVARA 2005 Repair Workshop Manual

DIFFERENTIAL LOCK SYSTEM
RFD-43
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
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RFD
System DiagramEDS003AS
COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationEDS003AT
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
For details, refer toDI-65, "
CAN Communication Unit".
SDIA2500E
Component parts Function
Differential lock control unit
lControls differential lock solenoid and switches differential lock/unlock.
lAs a fail-safe function, differential lock disengages, if malfunction is detected in differential lock
system.
Differential lock solenoid Controls pressure plate by current from differential lock control unit.
Differential lock position switch Detects that differential is lock or unlock condition.
Differential lock mode switch Able to select differential lock or unlock.
DIFF LOCK indicator lamp Illuminates that differential is in lock or lock standby condition.
ABS actuator and electric unit
(control unit)Transmits the following signals via CAN communication to differential lock control unit.
lVehicle speed signal
Transfer control unitTransmits the following signal via CAN communication to differential lock control unit.
l4WD shift switch signal

RFD-44
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
PFP:00004
Fail-safe FunctionEDS003AU
If any malfunction occurs in differential lock system, and control unit detects the malfunction, DIFF LOCK indi-
cator lamp on combination meter does not turn ON to indicate system malfunction. Differential lock control unit
turns differential lock solenoid OFF.
How to Perform Trouble DiagnosisEDS003AV
BASIC CONCEPT
lTo perform trouble diagnosis, it is the most important to have understanding about vehicle systems (con-
trol and mechanism) thoroughly.
lIt is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptoms, and understand them fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptoms by driving vehicle with
customer.
CAUTION:
Customers are not professional. It is dangerous to make an
easy guess like "maybe the customer means that...," or
"maybe the customer mentions this symptom".
lIt is essential to check symptoms right from the beginning in
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on
interview with customer and past examples. Do not perform
inspection on ad hoc basis. Most intermittent malfunctions are
caused by poor contacts. In this case, it will be effective to shake
suspected harness or connector by hand. When repairing with-
out any symptom diagnosis, you cannot judge if malfunctions
have actually been eliminated.
lAfter completing diagnosis, always erase diagnostic memory.
Refer toRFD-52, "
How to Erase Self-diagnostic Results".
lFor intermittent malfunctions, move harness or harness connec-
tor by hand. Then check for poor contact or reproduced open circuit.
SEF233G
SEF234G

TROUBLE DIAGNOSIS
RFD-45
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
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RFD
Location of Electrical PartsEDS003AW
SDIA3427E

RFD-46
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
TROUBLE DIAGNOSIS
Wiring Diagram — DIFLOC —
EDS003AX
MDWA0065E

TROUBLE DIAGNOSIS
RFD-47
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
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RFD
MDWA0066E

RFD-48
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
TROUBLE DIAGNOSIS
Trouble Diagnosis Chart for Symptoms
EDS003AY
If DIFF LOCK indicator lamp does not turn ON after engine start, perform self-diagnosis. Refer toRFD-51, "SELF-DIAG RESULTSMODE".
Differential Lock Control Unit Input/Output Signal Reference ValuesEDS003AZ
DIFFERENTIAL LOCK CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Symptom Condition Check itemReference
page
DIFF LOCK indicator lamp does not turn ON.
(DIFF LOCK indicator lamp check)Ignition switch: ONCAN communication line
RFD-70
Power supply and ground for differential
lock control unit
Combination meter
DIFF LOCK indicator lamp does not change.
lEngine running
lDifferential lock mode
switch: ONCombination meter
RFD-73Differential lock mode switch
CAN communication line
DIFF LOCK indicator lamp sometimes flashes.
lEngine running
lDifferential lock mode
switch: ONCombination meter
RFD-74Differential lock mode switch
Differential lock position switch
Differential inner parts
Monitor item [Unit] Content Condition Display value
BATTERY VOLT [V]Power supply voltage for
differential lock control unitIgnition switch: ON Battery voltage
4WD MODE [2H/4H/
4Lo]Condition of 4WD shift
switch4WD shift switch
(Engine running)2WD 2H
4H 4H
4LO 4Lo
VHCL S/SEN-R [km/h]
or [mph]Wheel speed
(Rear wheel right)Vehicle stopped 0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition.Approximately
equal to the indi-
cation on speed-
ometer (Inside of
±10%)
VHCL S/SEN-L [km/h] or
[mph]Wheel speed
(Rear wheel left)Vehicle stopped 0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition.Approximately
equal to the indi-
cation on speed-
ometer (Inside of
±10%)
VHCL S/SEN-RL [km/h]
or [mph]Wheel speed
(Average value of rear
wheel right and left)Vehicle stopped 0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition.Approximately
equal to the indi-
cation on speed-
ometer (Inside of
±10%)
D-LOCK SW SIG [ON/
OFF]Condition of differential
lock mode switchDifferential lock mode switch: ON ON
Differential lock mode switch: OFF OFF
D-LOCK SIG [ON/OFF]Control status of differen-
tial lock
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode
switch: ONON
Differential lock mode
switch: OFFOFF

TROUBLE DIAGNOSIS
RFD-49
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
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Specifications Between Differential Lock Control Unit Terminals
DIFFERENTIAL LOCK CONTROL UNIT TERMINAL CONNECTOR LAYOUT
Data are reference value and are measured between each terminal and ground.RELAY ON [ON/OFF]Operating condition of dif-
ferential lock solenoid
relay (integrated in differ-
ential lock control unit)
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode
switch: ONON
Differential lock mode
switch: OFFOFF
RELAY MTR [ON/OFF]Control status of differen-
tial lock solenoid relay
(integrated in differential
lock control unit)
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode
switch: ONON
Differential lock mode
switch: OFFOFF
SOL MTR [ON/OFF]Control status of differen-
tial lock solenoid
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode
switch: ONON
Differential lock mode
switch: OFFOFF
IND MTR [ON/OFF]Control status of DIFF
LOCK indicator lampDIFF LOCK indicator lamp: ON ON
DIFF LOCK indicator lamp: OFF OFF
D-LOCK POS SW [ON/
OFF]Condition of differential
lock position switch
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode
switch: ON
(DIFF LOCK indicator
lamp: ON)ON
Differential lock mode
switch: OFF
(DIFF LOCK indicator
lamp: OFF)OFF Monitor item [Unit] Content Condition Display value
SDIA2573E
TerminalWire
colorItem Condition Data (Approx.)
1 O Power supplyIgnition switch: ON Battery voltage
Ignition switch: OFF 0V
2 O Power supplyIgnition switch: ON Battery voltage
Ignition switch: OFF 0V
3 B Ground Always 0V
4 P CAN-L – –
5 L CAN-H – –
9YDifferential lock mode switch
(ON)Ignition switch: ONDifferential lock mode switch: ON Battery voltage
Differential lock mode switch: OFF 0V
10 B Ground Always 0V

RFD-50
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
TROUBLE DIAGNOSIS
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
CONSULT-II Function (DIFF LOCK)EDS003B0
FUNCTION
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II SETTING PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
NOTE:
For details, refer to the separate “CONSULT-II Operations Manual”.
1. Turn ignition switch “OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data
link connector on vehicle.
3. Turn ignition switch “ON”.
11 GR Differential lock solenoid (-)
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode switch: ON 0V
Differential lock mode switch: OFF Battery voltage
12 L Differential lock solenoid (+)
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode switch: ON 0V
Differential lock mode switch: OFF Battery voltage
13 G K-LINE (CONSULT-II signal) – –
15 RPower supply
(Memory back-up)Ignition switch: ON Battery voltage
Ignition switch: OFF Battery voltage
20 BRDifferential lock position
switch
lVehicle stopped
lEngine running
l4WD shift switch: 4LODifferential lock mode switch: ON
(DIFF LOCK indicator lamp: ON)0V
Differential lock mode switch: OFF
(DIFF LOCK indicator lamp: OFF)Battery voltage
21 SB DIFF LOCK indicator lamp Ignition switch: ONDIFF LOCK indicator lamp: ON 0V
DIFF LOCK indicator lamp: OFF Battery voltage
22 GDifferential lock mode switch
(OFF)Ignition switch: ONDifferential lock mode switch: ON 0V
Differential lock mode switch: OFF Battery voltage Te r m i n a lWire
colorItem Condition Data (Approx.)
Diagnostic test mode FunctionReference
page
Self-diagnostic results
lSelf-diagnostic results can be read and erased quickly.RFD-51
Data monitorlInput/Output data in the differential lock control unit can be read.RFD-53
CAN diagnostic support monitorlThe results of transmit/receive diagnosis of CAN communication can be read.LAN-15
BDIA0013E

TROUBLE DIAGNOSIS
RFD-51
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
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4. Touch “START (NISSAN BASED VHCL)”.
5. Touch “DIFF LOCK”.
If “DIFF LOCK” is not indicated, go toGI-50, "
CONSULT-II Data
Link Connector (DLC) Circuit".
6. Perform each diagnostic test mode according to each service
procedure.
SELF-DIAG RESULTS MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE”. Refer toRFD-50, "CONSULT-II SETTING PROCE-
DURE".
2. With engine at idle, touch “SELF-DIAG RESULTS”.
Display shows malfunction experienced since the last erasing
operation.
NOTE:
lThe details for “TIME” are as follow:
–“0”: Error currently detected with differential lock control
unit.
–Except for “0”: Error detected in the past and memorized
with differential lock control unit.
Detects frequency of driving after DTC occurs (frequency
of turning ignition switch “ON/OFF”).
Display Item List
BCIA0029E
BCIA0030E
SDIA2547E
Items (CONSULT-II screen
terms)Diagnostic item is detected when... Check item
*INITIAL START*
[P1833]Due to removal of battery which cuts off power supply to differential
control unit, self-diagnosis memory function is suspended.RFD-54, "
Power Supply Circuit
For Differential Lock Control
Unit"
CONTROL UNIT 1
[P1834]Malfunction is detected in the memory (RAM) system of differential
lock control unit.RFD-56, "Differential Lock Con-
trol Unit"
CONTROL UNIT 2
[P1835]Malfunction is detected in the memory (ROM) system of differential
lock control unit.RFD-56, "Differential Lock Con-
trol Unit"
CONTROL UNIT 3
[P1836]Malfunction is detected in the memory (EEPROM) system of differ-
ential lock control unit.RFD-56, "Differential Lock Con-
trol Unit"
CONTROL UNIT 4
[P1837]AD converter system of differential lock control unit is malfunction-
ing.RFD-56, "Differential Lock Con-
trol Unit"
ON SW
[P1838]More than two switch inputs are simultaneously detected due to
short circuit of differential lock mode switch.RFD-56, "Differential Lock Mode
Switch"

RFD-52
[WITH ELECTRONIC LOCKING DIFFERENTIAL]
TROUBLE DIAGNOSIS
CAUTION:
If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communication
line.
How to Erase Self-diagnostic Results
1. Perform applicable inspection of malfunctioning item and then repair or replace.
2. Start engine and select “SELF-DIAG RESULTS” mode for “DIFF LOCK” with CONSULT-II.
3. Touch “ERASE” on CONSULT-II screen to erase DTC memory.
CAUTION:
If memory cannot be erased, perform diagnosis.
POSI SW ON
[P1839]When differential lock position switch is ON, rotation difference
occurs in wheel speed (rear wheel right and left).RFD-60, "Differential Lock Posi-
tion Switch"
RELAY
[P1844]Differential lock control unit detects as irregular by comparing target
value with monitor value.RFD-63, "Differential Lock Sole-
noid Relay",RFD-64, "Differen-
tial Lock Solenoid"
SOL CIRCUIT
[P1847]Malfunction is detected in differential lock control unit internal circuit.RFD-64, "Differential Lock Sole-
noid"
SOL DISCONNECT
[P1848]lDifferential lock solenoid internal circuit or harness is open.
lDifferential lock solenoid relay does not switch to ON position.RFD-64, "
Differential Lock Sole-
noid"
SOL SHORT
[P1849]Differential lock solenoid internal circuit or harness is shorted.RFD-64, "Differential Lock Sole-
noid"
SOL CURRENT
[P1850]Differential lock solenoid relay does not switch to OFF position.RFD-64, "Differential Lock Sole-
noid"
ABS SYSTEM
[C1203]Malfunction related to wheel sensor has been detected by ABS
actuator and electric unit (control unit).RFD-68, "ABS System"
CAN COMM CIRCUIT
[U1000]Malfunction has been detected from CAN communication line.RFD-69, "CAN Communication
Line"
NO DTC IS DETECTED.
FURTHER TESTING MAY
BE REQUIRED.No NG item has been detected. — Items (CONSULT-II screen
terms)Diagnostic item is detected when... Check item