Nissan Pathfinder. Manual — part 395
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< ECU DIAGNOSIS INFORMATION >
[TRANSFER: TY21C]
4WD CONTROL UNIT
*: The values are changed by throttle opening and engine speed.
CAUTION:
When using circuit tester to measure voltage for inspection, be sure not to extend forcibly any con-
nector terminals.
Fail-Safe
INFOID:0000000009177719
• If any malfunction occurs in 4WD electrical system, and control unit detects the malfunction, 4WD warning
indicator on information display is displayed to indicate system malfunction.
• When 4WD warning indicator is displayed, vehicle changes to front-wheel drive or shifts to 4-wheel drive
(rear-wheels still have some driving torque).
Protection Function
INFOID:0000000009177720
4WD system activates its protection function (shuts down 4WD system temporarily) if 4WD system detects
high load continuously or the front wheel tire size differs from the rear tire size. (4WD system is automatically
restored if 4WD system no longer detects any overload or the tire size difference is eliminated.)
14
(BR)
Ground 4WD shift switch (LOCK)
Output Ignition switch: ON
4WD shift switch: 2WD
Battery voltage
4WD shift switch: AUTO
Battery voltage
4WD shift switch: LOCK
(State of hold of LOCK position)
0 V
15
(Y)
Ground
Power supply (4WD control
unit)
Input
Always
Battery voltage
16
(P)
—
CAN-L
Input/
Output
—
—
Terminal No.
(Wire color)
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
DTC
4WD warning indicator
Possible cause
Vehicle condition
C1201
(Indicator lamp illuminates)
Internal malfunction of 4WD control unit
Front-wheel drive or shifts
to 4-wheel drive (Rear-
wheels still have some
driving torque)
C1203
ABS malfunction
• Vehicle speed signal error
C1204
• Internal malfunction of electronic controlled coupling
• Malfunction of 4WD solenoid power supply circuit
(open or short)
• Malfunction of 4WD solenoid command current
C1205
• Internal malfunction of 4WD control unit
• Malfunction of 4WD solenoid power supply circuit
(ground short)
C1209
Malfunction of 4WD shift switch or 4WD shift switch cir-
cuit
C1210
Malfunction of engine control system
P1804
Internal malfunction of 4WD control unit
P181F
Writing unit characteristics is incomplete.
U1000
• CAN communication error
• Malfunction of 4WD control unit
U1010
Malfunction of 4WD control unit
ALDIA0417ZZ
4WD CONTROL UNIT
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< ECU DIAGNOSIS INFORMATION >
[TRANSFER: TY21C]
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DTC Inspection Priority Chart
INFOID:0000000009177721
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC Index
INFOID:0000000009177722
4WD warning indicator
Possible cause
Vehicle condition
Quick blinking
(Blinking for approximately 1 minute
and then turned OFF)
Drive train parts in protection mode. It is not malfunction.
(Internal temperature rise of electronic controlled coupling)
When this message is displayed, refer to
Shuts down 4WD system tem-
porarily
(Front wheel drive)
Slow blinking
(Continuing to blink until ignition switch
is turned OFF)
Malfunction in each tire or different tire diameter
When this message is displayed, refer to
ALDIA0417ZZ
ALDIA0417ZZ
Priority
Detected items (DTC)
1
• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT (CAN)
2
• C1201 CONTROLLER FAILURE
• C1205 4WD ACTUATOR RLY
3
• C1204 4WD SOLENOID
4
• C1203 ABS SYSTEM
• C1210 ENGINE SIGNAL 1
5
• C1209 MODE SW
6
• P1804 CONTROL UNIT 3
7
• P181F INCOMP CALIBRATION
DTC
Display Item
Reference
C1201
CONTROLLER FAILURE
C1203
ABS SYSTEM
C1204
4WD SOLENOID
C1205
4WD ACTUATOR RLY
C1209
MODE SW
C1210
ENGINE SIGNAL 1
P1804
CONTROL UNIT 3
P181F
INCOMP CALIBRATION
U1000
CAN COMM CIRCUIT
U1010
CONTROL UNIT (CAN)
DLN-24
< WIRING DIAGRAM >
[TRANSFER: TY21C]
4WD SYSTEM
WIRING DIAGRAM
4WD SYSTEM
Wiring Diagram -With Around View Monitor System-
INFOID:0000000009177723
ABDWA0691GB
4WD SYSTEM
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< WIRING DIAGRAM >
[TRANSFER: TY21C]
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ABDIA1103GB
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