Infiniti FX35, FX50 (S51). Manual — part 548

POWER SUPPLY AND GROUND CIRCUIT

DLN-27

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

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POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000005249070

Supplies power to AWD control unit.

Diagnosis Procedure

INFOID:0000000005249071

1.

CHECK AWD CONTROL UNIT POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Disconnect AWD control unit harness connector.

3.

Check the voltage between AWD control unit harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between AWD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK AWD CONTROL UNIT POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#45).

3.

Disconnect IPDM E/R harness connector.

4.

Check the continuity between AWD control unit harness connector and IPDM E/R harness connector.

5.

Check the continuity between AWD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for ignition power supply circuit. Refer to

PG-81, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK AWD CONTROL UNIT POWER SUPPLY (3)

1.

Turn the ignition switch OFF.

2.

Check the voltage between AWD control unit harness connector and ground.

AWD control unit

—

Voltage (Approx.)

Connector

Terminal

M105

7

Ground

0 V

AWD control unit

—

Voltage

Connector

Terminal

M105

7

Ground

Battery voltage

AWD control unit

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M105

7

E5

25

Existed

AWD control unit

—

Continuity

Connector

Terminal

M105

7

Ground

Not existed

DLN-28

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[TRANSFER: ETX13C]

POWER SUPPLY AND GROUND CIRCUIT

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between AWD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK AWD CONTROL UNIT POWER SUPPLY (4)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#11).

3.

Disconnect fuse block (J/B) harness connector.

4.

Check the continuity between AWD control unit harness connector and fuse block (J/B).

5.

Check the continuity between AWD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to

PG-6, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

5.

CHECK AWD SOLENOID POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Disconnect AWD solenoid harness connector.

3.

Check the voltage between AWD control unit harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between AWD control unit harness connector and ground.

AWD control unit

—

Voltage (Approx.)

Connector

Terminal

M105

15

Ground

Battery voltage

AWD control unit

—

Voltage

Connector

Terminal

M105

15

Ground

Battery voltage

AWD control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

M105

15

M1

1A

Existed

AWD control unit

—

Continuity

Connector

Terminal

M105

15

Ground

Not existed

AWD control unit

—

Voltage

Connector

Terminal

M105

9

Ground

Battery voltage

AWD control unit

—

Voltage

Connector

Terminal

M105

9

Ground

Battery voltage

POWER SUPPLY AND GROUND CIRCUIT

DLN-29

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

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Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

CHECK AWD SOLENOID POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#33).

3.

Check the harness for open or short between AWD control unit harness connector No.9 terminal and fuse
box.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to

PG-6, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

7.

CHECK AWD CONTROL UNIT GROUND

1.

Turn the ignition switch OFF.

2.

Check the continuity between AWD control unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace error-detected parts.

AWD control unit

—

Continuity

Connector

Terminal

M105

10

Ground

Existed

11

DLN-30

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

AWD WARNING LAMP

AWD WARNING LAMP

Description

INFOID:0000000005249072

• Turns ON when there is a malfunction in AWD system. AWD warning lamp indicates the vehicle is in fail-safe

mode and shifting to rear-wheel drive or 4-wheel drive (front-wheels still have some driving torque).

• Also turns ON when ignition switch is turned ON, for the purpose of lamp check. Turns OFF approximately

for 1 second after the engine starts if system is normal.

AWD WARNING LAMP INDICATION

CAUTION:

• AWD warning lamp also turns ON due to data reception error, CAN communication error etc.

Component Function Check

INFOID:0000000005249073

1.

CHECK AWD WARNING LAMP FUNCTION

1.

Turn the ignition switch ON.

2.

Make sure that AWD warning lamp lights up.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to diagnosis procedure. Refer to

DLN-30, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005249074

1.

CHECK POWER SUPPLY AND GROUND CIRCUIT

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

DLN-27, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the error-detected parts.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

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

Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 3.

3.

CHECK AWD WARNING LAMP SIGNAL

With CONSULT-III

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

2.

Check “4WD WARN LAMP” of CONSULT-III “DATA MONITOR” for “ALL MODE AWD/4WD”.

Does the item on “DATA MONITOR” indicate “On”?

YES

>> GO TO 4.

Condition

AWD warning lamp

Lamp check

Turns ON when ignition switch is turned ON. Turns OFF ap-

prox. 1 second after the engine start.

AWD system malfunction

ON

Protection function is activated due to heavy load to electric controlled
coupling. (AWD system is not malfunctioning and AWD system chang-
es to rear wheel drive.)

Quick blinking: 2 times/second

(Blinking in approx. 1 minute and then turning OFF)

Large difference in diameter of front/rear tires

Slow blinking: 1 time/2 seconds

(Continuing to blink until turning ignition switch OFF)

Other than above (system normal)

OFF