Infiniti EX35. Manual - part 520

DLN-30

< ECU DIAGNOSIS >

[TRANSFER: ETX13B]

AWD CONTROL UNIT

Fail-Safe

INFOID:0000000003561209

AWD system

• If any malfunction occurs in AWD electrical system, and control unit detects the malfunction, AWD warning

lamp on combination meter turns ON to indicate system malfunction.

• When AWD warning lamp is ON, vehicle changes to rear-wheel drive or shifts to 4-wheel drive (front-wheels

still have some driving torque).

JCDWM0207GB

AWD CONTROL UNIT

DLN-31

< ECU DIAGNOSIS >

[TRANSFER: ETX13B]

C

E

F

G

H

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A

B

DLN

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O

P

• AWD system activates its protection function (shuts down AWD system temporarily) if AWD system detects

high load continuously or the front wheel tire size differs from the rear tire size. (AWD system is automati-
cally restored if AWD system no longer detects any overload or the tire size difference is eliminated.)

*1: Quick blinking: 2 times/second (blinking for approximately 1 minute and then turned OFF)

*2: Slow blinking: 1 time/2 seconds (continuing to blink until ignition switch is turned OFF)

DTC Inspection Priority Chart

INFOID:0000000003135696

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

DTC Index

INFOID:0000000003135697

Mode

Warning 

lamp

DTC

Detected area (Error area)

Error area and root cause

Protection 

function

 Blinking

*1

—

AWD  control  unit

Transfer assembly in protection mode
(Internal temperature rise of electronic controlled coupling)

Blinking

*2

—

Outer diameters of front and 
rear wheel tires

Malfunction in each tire or different tire diameter

Fail-safe

ON

C1201

AWD control unit

Internal malfunction of AWD control unit

C1203

ABS actuator and electric 
unit (control unit)

ABS malfunction
• Vehicle speed signal error

C1204

AWD solenoid

Internal malfunction of electronic controlled coupling

C1205

AWD control unit

Internal malfunction of AWD control unit

C1210

ECM

Malfunction of engine control system
• Accelerator pedal position signal error
• Engine speed signal error

U1000

CAN communication line

• CAN communication error
• Malfunction of AWD control unit

U1010

AWD control unit

Malfunction of AWD control unit

Priority

Detected items (DTC)

1

• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT (CAN)

2

• C1201 CONTROLLER FAILURE
• C1205 4WD ACTUATOR RLY

3

• C1203 ABS SYSTEM
• C1210 ENGINE SIGNAL 1

4

• C1204 4WD SOLENOID

DTC

Display Items

Reference

C1201

CONTROLLER FAILURE

DLN-13, "DTC Logic"

C1203

ABS SYSTEM

DLN-14, "DTC Logic"

C1204

4WD SOLENOID

DLN-15, "DTC Logic"

C1205

4WD ACTUATOR RLY

DLN-17, "DTC Logic"

C1210

ENGINE SIGNAL 1

DLN-18, "DTC Logic"

U1000

CAN COMM CIRCUIT

DLN-19, "DTC Logic"

U1010

CONTROL UNIT (CAN)

DLN-20, "DTC Logic"

DLN-32

< SYMPTOM DIAGNOSIS >

[TRANSFER: ETX13B]

AWD WARNING LAMP DOES NOT TURN ON

SYMPTOM DIAGNOSIS

AWD WARNING LAMP DOES NOT TURN ON

Description

INFOID:0000000003561238

AWD warning lamp does not turn ON when the ignition switch is turned to ON.

Diagnosis Procedure

INFOID:0000000003561239

1.

CHECK AWD WARNING LAMP

Perform the trouble diagnosis for AWD warning lamp. Refer to 

DLN-23, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check each harness connector pin terminal for malfunction or disconnection.

NO

>> Repair or replace the malfunctioning part.

AWD WARNING LAMP DOES NOT TURN OFF

DLN-33

< SYMPTOM DIAGNOSIS >

[TRANSFER: ETX13B]

C

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AWD WARNING LAMP DOES NOT TURN OFF

Description

INFOID:0000000003561240

AWD warning lamp does not turn OFF several seconds after the engine started.

Diagnosis Procedure

INFOID:0000000003561241

1.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform AWD control unit self-diagnosis.

Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

CHECK AWD WARNING LAMP

Perform the trouble diagnosis of the AWD warning lamp. Refer to 

DLN-23, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning part.

3.

CHECK AWD CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Perform the trouble diagnosis of the power supply and ground circuit. Refer to 

DLN-21, "Diagnosis Proce-

dure"

.

Is the inspection result normal?

YES

>> Check each harness connector pin terminal for malfunction or disconnection.

NO

>> Repair or replace the malfunctioning part.