Infiniti FX35, FX50 (S51). Manual - part 543

DIAGNOSIS AND REPAIR WORK FLOW

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< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

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DETAILED FLOW

1.

INTERVIEW FROM THE CUSTOMER

Clarify customer complaints before inspection. First of all, reproduce symptoms, and understand them fully.
Ask customer about his/her complaints carefully. Check symptoms by driving vehicle with customer, if neces-
sary.

CAUTION:

Customers are not professional. Never guess easily like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.

>> GO TO 2.

2.

CHECK AWD WARNING LAMP

Start the engine and drive at 30 km/h (19 MPH) or more for approximately 1 minute.
Does AWD warning lamp turn ON?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

2.

Check malfunction detected by self-diagnosis.

3.

Erase self-diagnostic results for “ALL MODE AWD/4WD”.

>> GO TO 4.

4.

CHECK TERMINALS AND HARNESS CONNECTORS

Check pin terminals for damage or loose connection with harness connector.

>> GO TO 5.

5.

CHECK SYMPTOM REPRODUCTION

With CONSULT-III

Perform DTC reproduction procedure for the error system.

Is any error detected?

YES

>> GO TO 2.

NO

>> GO TO 6.

6.

PERFORM SYMPTOM DIAGNOSIS

Perform the symptom diagnosis for each system.
Is any malfunction present?

YES

>> GO TO 2.

NO

>> GO TO 7.

7.

FINAL CHECK

With CONSULT-III

Check input/output signal standard of  “ALL MODE AWD/4WD”.

Is the input/output the standard value?

YES

>> INSPECTION END

NO

>> GO TO 2.

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< SYSTEM DESCRIPTION >

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AWD SYSTEM

SYSTEM DESCRIPTION

AWD SYSTEM

System Diagram

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CONTROL DIAGRAM

 CROSS-SECTIONAL VIEW

JPDIE0103GB

AWD SYSTEM

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< SYSTEM DESCRIPTION >

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JSDIA0803ZZ

1.

Electromagnet

2.

Control clutch

3.

Cam

4.

Drive chain

5.

Front case

6.

Main shaft

7.

Front drive shaft

8.

Main clutch

9.

Rear case

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Electromagnet

2.

Control clutch

3.

Cam

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< SYSTEM DESCRIPTION >

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AWD SYSTEM

System Description

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DESCRIPTION

• Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
• Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.
• On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close to

rear-wheel drive.

• Sensor inputs determine the vehicle's turning condition, and in response tight cornering/braking are con-

trolled by distributing optimum torque to front wheels.

• It transmits/receives each signal from the following control unit via CAN communication line.

NOTE:
• When driving, if there is a large difference between front and rear wheel speed which continues for a long

time, fluid temperature of drive system parts becomes too high and AWD warning lamp blinks quickly. (When
AWD warning lamp blinks, vehicle changes to rear-wheel drive conditions.) Also, optional distribution of
torque sometimes becomes rigid before lamp blinks quickly, but it is not a malfunction.

• If AWD warning lamp is blinking quickly, stop vehicle and allow it to idle for some time. Blinking will stop and

AWD system will be restored.

• When driving, AWD warning lamp may blink slowly if there is a significant difference in diameter of the tires.

At this time, vehicle performance is not fully available and cautious driving is required. (Continues until the
engine is turned OFF.)

• If the warning lamp blinks slowly during driving but remains OFF after the engine is restarted, the system is

normal. If it again blinks slowly after driving for some time, vehicle must be inspected.

• When there is a difference of revolution speed between the front and rear wheel the shift occasionally

changes to direct 4-wheel driving conditions automatically. This is not a malfunction.

OPERATION PRINCIPLE

ELECTRIC CONTROLLED COUPLING

1.

AWD control unit supplies command current to electric controlled coupling (AWD solenoid).

2.

Control clutch is engaged by electromagnet and torque is detected in control clutch.

3.

The cam operates in response to control clutch torque and applies pressure to main clutch.

4.

Drive chain

5.

Front case

6.

Main shaft

7.

Front drive shaft

8.

Main clutch

9.

Rear case

Component parts

Function

ABS actuator and electric unit (control unit)

Transmits the following signals via CAN communication to AWD control unit.
• Vehicle speed signal
• Stop lamp switch signal (brake signal)

ECM

Transmits the following signals via CAN communication to AWD control unit.
• Accelerator pedal position signal
• Engine speed signal

Unified meter and A/C amp.

Transmits conditions of parking brake switch via CAN communication to AWD control 
unit.

JPDIE0095GB

1.

Main clutch

2.

Control clutch

3.

Cam

4.

Electromagnet

: Current commanded from AWD control unit.