Infiniti M35/M45 Y50. Manual - part 1132

TROUBLE DIAGNOSIS FOR SYMPTOMS

TF-35

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4. 

CHECK AWD CONTROL UNIT

Check AWD control unit input/output signal. Refer to 

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

Values"

 .

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-II

1.

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

2.

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

3.

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

OK or NG

OK >> GO 

TO 

6.

NG

>> Perform trouble diagnosis for combination meter. Refer

to 

DI-18, "Trouble Diagnosis"

 .

6. 

SYMPTOM CHECK

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace unified meter control unit assembly. Refer to 

DI-27, "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

NDS000DW

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-22, "SELF-DIAG RESULT MODE"

 .

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

YES

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

TF-32, "CAN Communication

Line"

 .

NO

>> GO TO 2.

2. 

CHECK ACCELERATOR PEDAL POSITION SIGNAL CIRCUIT

Perform self-diagnosis for ECM. Refer to 

EC-55, "Emission-Related Diagnostic Information"

 .

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 3.

Monitor item

Condition

Display value

4WD W/L

Ignition switch ON

ON

Start engine (after several seconds)

OFF

SDIA2065E

TF-36

TROUBLE DIAGNOSIS FOR SYMPTOMS

3. 

CHECK SYSTEM FOR AWD SOLENOID

Perform trouble diagnosis for AWD solenoid system. Refer to 

TF-28, "AWD 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-

45, "Disassembly and Assembly"

 .

NO

>> GO TO 5.

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

Values"

 .

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

NDS000DX

DIAGNOSTIC PROCEDURE

1. 

CHECK AWD WARNING LAMP

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

Does AWD warning lamp turn on? 

YES

>> GO TO 2.

NO

>> Go to 

TF-33, "AWD Warning Lamp Does Not Turn ON When The Ignition Switch Is Turned to ON"

.

2. 

CHECK SYSTEM FOR CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

TF-22, "SELF-DIAG RESULT MODE"

 .

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

YES

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

TF-32, "CAN Communication

Line"

 .

NO

>> GO TO 3.

TROUBLE DIAGNOSIS FOR SYMPTOMS

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3. 

CHECK AWD SOLENOID

Check AWD solenoid. Refer to 

TF-30, "COMPONENT INSPECTION"

 .

OK or NG

OK

>> GO TO 4.

NG

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

TF-45, "Disassem-

bly and Assembly"

 .

4. 

CHECK AWD CONTROL UNIT

Check AWD control unit input/output signal. Refer to 

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

Values"

 .

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. 

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-45, "Disassembly and Assembly"

 .

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

NDS000DY

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)

NDS000DZ

NOTE:
Slow flashing: 1 time/2 seconds

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.)

TF-38

TROUBLE DIAGNOSIS FOR SYMPTOMS

2. 

CHECK INPUT SIGNAL OF TIRE DIAMETER

 With CONSULT-II

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-II.

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

Values"

 .

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.

SDIA1900E