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
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
.
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-
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
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
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
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
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
NO
>> GO TO 3.
TROUBLE DIAGNOSIS FOR SYMPTOMS
TF-37
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E
F
G
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L
M
A
B
TF
3.
CHECK AWD SOLENOID
OK or NG
OK
>> GO TO 4.
NG
>> Replace electric controlled coupling for malfunction of AWD solenoid. Refer to
4.
CHECK AWD CONTROL UNIT
Check AWD control unit input/output signal. Refer to
TF-20, "AWD Control Unit Input/Output Signal Reference
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
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
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