Nissan Pathfinder. Manual - part 395

DLN-22

< 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 

DLN-67, "Descrip-

tion"

.

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 

DLN-68, "Diagno-

sis Procedure"

.

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

DLN-45, "DTC Logic"

C1203

ABS SYSTEM

DLN-46, "DTC Logic"

C1204

4WD SOLENOID

DLN-47, "DTC Logic"

C1205

4WD ACTUATOR RLY

DLN-50, "DTC Logic"

C1209

MODE SW

DLN-52, "DTC Logic"

C1210

ENGINE SIGNAL 1

DLN-55, "DTC Logic"

P1804

CONTROL UNIT 3

DLN-56, "DTC Logic"

P181F

INCOMP CALIBRATION

DLN-57, "DTC Logic"

U1000

CAN COMM CIRCUIT

DLN-58, "DTC Logic"

U1010

CONTROL UNIT (CAN)

DLN-59, "DTC Logic"

DLN-24

< WIRING DIAGRAM >

[TRANSFER: TY21C]

4WD SYSTEM

WIRING DIAGRAM

4WD SYSTEM

Wiring Diagram -With Around View Monitor System-

INFOID:0000000009177723

ABDWA0691GB

4WD SYSTEM

DLN-25

< WIRING DIAGRAM >

[TRANSFER: TY21C]

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ABDIA1103GB