Infiniti FX35 / FX45. Manual - part 955

 

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Infiniti FX35 / FX45. Manual - part 955

 

 

TROUBLE DIAGNOSIS FOR SYMPTOMS

TF-31

< SERVICE INFORMATION >

C

E

F

G

H

I

J

K

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M

A

B

TF

N

O

P

2.

Disconnect AWD control unit harness connector.

3.

Turn ignition switch “ON”. (Do not start engine.)

4.

Check voltage between AWD control unit harness connector ter-
minals and ground.

5.

Turn ignition switch “OFF”.

6.

Check voltage between AWD control unit harness connector ter-
minals and ground.

OK or NG

OK

>> GO TO 3.

NG

>>

Check the following. If any items are damaged, repair
or replace damaged parts.

• 10A fuse [No. 12 or 21, located in the fuse block (J/B)]
• Harness for short or open between battery and AWD control unit harness connector terminal 9
• Harness for short or open between ignition switch and AWD control unit harness connector ter-

minal 7

• Ignition switch. Refer to 

PG-3

.

3.

CHECK AWD CONTROL UNIT GROUND CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect AWD control unit harness connector.

3.

Check continuity between AWD control unit harness connector
M92 terminals 10, 11 and ground.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

4.

CHECK AWD CONTROL UNIT

Check AWD control unit input/output signal. Refer to 

TF-20, "AWD Control Unit Input/Output Signal Reference

Value"

.

OK or NG

OK

>> GO TO 5.

NG

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

5.

CHECK OUTPUT SIGNAL WITH UNIFIED METER AND A/C AMP.

 With CONSULT-III

1.

Turn ignition switch “ON”. (Do not start engine.)

2.

Select “DATA MONITOR” mode for “METER A/C AMP” with CONSULT-III.

Connector

Terminal Voltage 

(Approx.)

M92

7 - Ground

Battery voltage

9 - Ground

SDIA2319E

Connector

Terminal

Voltage (Approx.)

M92

7 - Ground

0V

9 - Ground

Battery voltage

SDIA2320E

Continuity should exist.

SDIA1883E

TF-32

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS FOR SYMPTOMS

3.

Start the engine, and then make sure that “4WD W/L” display turns from “ON” to “OFF” after several sec-
onds.

OK or NG

OK 

>> GO TO 6.

NG

>> Perform trouble diagnosis for combination meter. Refer to 

DI-15, "Trouble Diagnosis"

.

6.

SYMPTOM CHECK

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace unified meter control unit assembly. Refer to 

DI-23, "Disassembly and Assembly of Com-

bination Meter"

.

Heavy Tight-Corner Braking Symptom Occurs When the Vehicle Is Driven and the 
Steering Wheel Is Turned Fully to Either Side after the Engine Is Started

INFOID:0000000001327452

NOTE:
Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunc-
tion.

DIAGNOSTIC PROCEDURE

1.

CHECK SYSTEM FOR CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

TF-21, "CONSULT-III Function (ALL MODE AWD/4WD)"

.

Is the “CAN COMM CIRCUIT [U1000]” displayed?

YES

>> Perform trouble diagnosis for CAN communication line. Refer to 

TF-28, "DTC U1000 CAN COMM

CIRCUIT"

.

NO

>> GO TO 2.

2.

CHECK ACCELERATOR PEDAL POSITION SIGNAL CIRCUIT

Perform self-diagnosis for ECM. Refer to 

EC-55, "Emission-Related Diagnostic Information"

 (VQ35DE mod-

els) or 

EC-633, "Emission-related Diagnostic Information"

 (VK45DE models).

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 3.

3.

CHECK SYSTEM FOR AWD SOLENOID

Perform trouble diagnosis for AWD solenoid system. Refer to 

TF-25, "DTC C1204 4WD SOLENOID"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

CHECK ELECTRIC CONTROLLED COUPLING

1.

Turn ignition switch “OFF”.

2.

Set the selector lever to “N” (neutral) position and disengage the parking brake.

3.

Lift up the vehicle.

4.

Rotate the rear propeller shaft by hand.

5.

Hold front propeller shaft lightly.

Does front propeller shaft rotate?

YES

>> Replace electric controlled coupling for mechanical malfunction (clutch sticking etc.). Refer to 

TF-

40, "Disassembly and Assembly"

.

NO

>> GO TO 5.

Monitor item

Condition

Display value

4WD W/L

Ignition switch ON

ON

Start engine (after several seconds)

OFF

TROUBLE DIAGNOSIS FOR SYMPTOMS

TF-33

< SERVICE INFORMATION >

C

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TF

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5.

SYMPTOM CHECK

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6.

CHECK AWD CONTROL UNIT

Check AWD control unit input/output signal. Refer to 

TF-20, "AWD Control Unit Input/Output Signal Reference

Value"

.

OK or NG

OK

>> INSPECTION END

NG

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

Vehicle Does Not Enter AWD Mode Even Though AWD Warning Lamp Turned to OFF

INFOID:0000000001327453

DIAGNOSTIC PROCEDURE

1.

CHECK AWD SOLENOID

Check AWD solenoid. Refer to 

TF-25, "DTC C1204 4WD SOLENOID"

.

OK or NG

OK

>> GO TO 2.

NG

>> Replace electric controlled coupling for malfunction of AWD solenoid. Refer to 

TF-40, "Disassem-

bly and Assembly"

.

2.

CHECK AWD CONTROL UNIT

Check AWD control unit input/output signal. Refer to 

TF-20, "AWD Control Unit Input/Output Signal Reference

Value"

.

OK or NG

OK

>> GO TO 3.

NG

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

3.

SYMPTOM CHECK

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace electric controlled coupling for mechanical malfunction (mechanical engagement of

clutch is not possible.). Refer to 

TF-40, "Disassembly and Assembly"

.

While Driving, AWD Warning Lamp Flashes Rapidly (When Flashing in Approx. 1 
Minute and Then Turning OFF)

INFOID:0000000001327454

NOTE:
Rapid flashing: 2 times/second
This symptom protects drivetrain parts when a heavy load is applied to the electric controlled coupling and
multiple disc clutch temperature increases. Also, optional distribution of torque sometimes becomes rigid
before lamp flashes rapidly. Both cases are not malfunction.
When this symptom occurs, stop vehicle and allow it to idle for some times. Flashing will stop and system will
be restored.

While Driving, AWD Warning Lamp Flashes Slowly (When Continuing to Flash until 
Turning Ignition Switch OFF)

INFOID:0000000001327455

NOTE:
Slow flashing: 1 time/2 seconds

TF-34

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS FOR SYMPTOMS

DIAGNOSTIC PROCEDURE

1.

CHECK TIRE

Check the following.
• Tire pressure
• Wear condition
• Longitudinal tire size (There is no difference between longitudinal tires.)

OK or NG

OK

>> GO TO 2.

NG

>> Drive at vehicle speed of 20 km/h (12 MPH) or more for 5 seconds or more after repairing or

replacing damaged parts. (Initialize improper size tire information.)

2.

CHECK INPUT SIGNAL OF TIRE DIAMETER

 With CONSULT-III

1.

Start engine.

2.

Drive at 20 km/h (12 MPH) or more for approx. 200 seconds.

3.

Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-III.

4.

Check monitor “DIS-TIRE MONI”.

Display of “DIS-TIRE MONI”

“0-4mm”>>INSPECTION END
Except for “0-4mm”>>GO TO 3.

3.

CHECK AWD CONTROL UNIT

Check AWD control unit input/output signal. Refer to 

TF-20, "AWD Control Unit Input/Output Signal Reference

Value"

.

OK or NG

OK

>> GO TO 4.

NG

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

4.

SYMPTOM CHECK

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace AWD control unit.

 

 

 

 

 

 

 

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