Infiniti FX35 / FX45. Manual — part 952

TROUBLE DIAGNOSIS

TF-19

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TDWM0058E

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TROUBLE DIAGNOSIS

Trouble Diagnosis Chart by Symptom

INFOID:0000000001327440

If AWD warning lamp turns ON, perform self-diagnosis. Refer to

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

.

NOTE:

Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunction.

AWD Control Unit Input/Output Signal Reference Value

INFOID:0000000001327441

AWD CONTROL UNIT INSPECTION TABLE

Specifications with CONSULT-III

Symptom

Condition

Check item

Reference page

AWD warning lamp does not turn ON when
the ignition switch is turned to ON.
(AWD warning lamp check)

Ignition switch: ON

CAN communication line

TF-30

Unified meter and A/C amp.

Unified meter control unit

AWD warning lamp does not turn OFF sev-
eral seconds after engine started.

Engine running

CAN communication line

TF-30

Power supply and ground for AWD con-
trol unit

Unified meter and A/C amp.

Unified meter control unit

AWD solenoid

AWD actuator relay (integrated in AWD
control unit)

Wheel sensor

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. (See NOTE.)

• While driving
• Steering wheel is

turned fully to either
sides

CAN communication line

TF-32

Accelerator pedal position signal

AWD solenoid

Mechanical malfunction of electric con-
trolled coupling (clutch sticking etc.)

Vehicle does not enter AWD mode even
though AWD warning lamp turned to OFF.

While driving

AWD solenoid

TF-33

Mechanical malfunction of electric con-
trolled coupling (Mechanical engage-
ment of clutch is not possible.)

While driving, AWD warning lamp flashes
rapidly. (When flashing in approx. 1 minute
and then turning OFF.)
Rapid flashing: 2 times/second

While driving

Protection function is activated due to
heavy load to electric controlled cou-
pling. (AWD system is not malfunction-
ing. Also, optional distribution of torque
sometimes becomes rigid before lamp
flashes rapidly, but it is not malfunction.)

TF-33

While driving, AWD warning lamp flashes
slowly. (When continuing to flash until turn-
ing ignition switch OFF)
Slow flashing: 1 time/2 seconds

• While driving
• Vehicle speed: 20 km/h

(12 MPH) or more

Tire size is different between front and
rear of vehicle.

TF-33

Monitored item [Unit]

Content

Condition

Display value

FR RH SENSOR [km/h] or [mph]

Wheel speed (Front wheel
right)

Vehicle stopped

0.00 km/h (0.00 mph)

Vehicle running

CAUTION:

Check air pressure of tire under
standard condition.

Approximately equal to
the indication on speed-
ometer (Inside of

±

10%)

TROUBLE DIAGNOSIS

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*: The values are changed by throttle opening and engine speed.

CONSULT-III Function (ALL MODE AWD/4WD)

INFOID:0000000001327442

FUNCTION

CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.

FR LH SENSOR [km/h] or [mph]

Wheel speed (Front wheel
left)

Vehicle stopped

0.00 km/h (0.00 mph)

Vehicle running

CAUTION:

Check air pressure of tire under
standard condition.

Approximately equal to
the indication on speed-
ometer (Inside of

±

10%)

RR RH SENSOR [km/h] or [mph]

Wheel speed (Rear wheel
right)

Vehicle stopped

0.00 km/h (0.00 mph)

Vehicle running

CAUTION:

Check air pressure of tire under
standard condition.

Approximately equal to
the indication on speed-
ometer (Inside of

±

10%)

RR LH SENSOR [km/h] or [mph]

Wheel speed (Rear wheel left)

Vehicle stopped

0.00 km/h (0.00 mph)

Vehicle running

CAUTION:

Check air pressure of tire under
standard condition.

Approximately equal to
the indication on speed-
ometer (Inside of

±

10%)

BATTERY VOLT [V]

Power supply voltage for AWD
control unit

Ignition switch: ON

Battery voltage

THRTL POS SEN [%]

Throttle opening condition

When depressing accelerator pedal
(Value rises gradually in response to
throttle position.)

0 - 100%

ETS SOLENOID [A]

Monitored value of current at
AWD solenoid

Engine running
• At idle speed

Approx. 0.000A

Engine running
• When depressing accelerator ped-

al

Approx. 0.000 - 2.400A*

STOP LAMP SW [ON/OFF]

Condition of brake pedal oper-
ation

Brake pedal: Depressed

ON

Brake pedal: Released

OFF

ENG SPEED SIG [RUN/STOP]

Condition of engine running

Engine stopped
(Engine speed: Less than 400 rpm)

STOP

Engine running
(Engine speed: 400 rpm or more)

RUN

ETS ACTUATOR [ON/OFF]

Operating condition of AWD
actuator relay (integrated in
AWD control unit)

Engine stopped (Ignition
switch: ON)

OFF

Engine running

ON

4WD WARN LAMP [ON/OFF]

AWD warning lamp condition

AWD warning lamp: ON

ON

AWD warning lamp: OFF

OFF

4WD MODE MON [AUTO]

Control status of AWD

Engine running

AUTO

DIS-TIRE MONI [mm]

Improper size tire installed
condition

Vehicle running with normal size tire
installed

0-4 mm

Vehicle running with improper size
tire installed (Front/rear tire size dif-
ference, wear condition)

4-8 mm, 8- mm

P BRAKE SW [ON/OFF]

Condition of parking brake

Parking brake operated

ON

Parking brake not operated

OFF

Monitored item [Unit]

Content

Condition

Display value

TF-22

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TROUBLE DIAGNOSIS

SELF-DIAG RESULT MODE

Drive at 30 km/h or more for approximately 1 minute before performing the self-diagnosis.

Display Item List

CAUTION:

• If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communication

line.

• Make sure that ABS warning lamp turns OFF by driving for a minute at vehicle speed of 30 km/h (19 MPH) or more after turn-

ing ignition switch “OFF” if AWD warning lamp turns ON with system malfunction of “ABS SYSTEM [C1203]”. AWD warning
lamp may not turn OFF if it is normal unless ignition switch turns OFF at once and engine restarts after that.

How to Erase Self-Diagnostic Results

Before erasing DTC memory, start the engine and drive at 30 km/h or more for approximately 1 minute.
Checkthat ABS warning lamp turns OFF.
NOTE:
Make sure that ABS warning lamp turns OFF by driving for a minute at vehicle speed of 30 km/h (19
MPH) or more after turning ignition switch “OFF” if AWD warning lamp turns ON with system malfunc-
tion of “ABS SYSTEM [C1203]”. AWD warning lamp may not turn OFF if it is normal unless ignition
switch turns OFF at once and engine restarts after that.

DATA MONITOR MODE

Display Item List

Diagnostic test mode

Function

ECU part number

4WD control unit part number can be read.

Self-diagnostic results

Self-diagnostic results can be read and erased quickly.

Data monitor

Input/Output data in the 4WD control unit can be read.

Active test

Diagnostic Test Mode in which CONSULT-III drives some actuators apart from the 4WD control unit
and also shifts some parameters in a specified range.

Items (CONSULT-III screen

terms)

Diagnostic item is detected when...

Check item

CONTROLLER FAILURE
[C1201]

Malfunction has occurred inside AWD control unit.

TF-24, "DTC C1201 CON-
TROLLER FAILURE"

ABS SYSTEM
[C1203]

Malfunction related to wheel sensor has been detected by ABS actu-
ator and electric unit (control unit).

TF-24, "DTC C1203 ABS
SYSTEM"

4WD SOLENOID
[C1204]

Malfunction related to AWD solenoid has been detected.

TF-25, "DTC C1204 4WD
SOLENOID"

4WD ACTUATOR RLY
[C1205]

Malfunction has been detected from AWD actuator relay integrated
with AWD control unit, or malfunction related to AWD solenoid has
been detected.

TF-27, "DTC C1205 4WD
ACTUATOR RLY"

or

TF-25,

"DTC C1204 4WD SOLE-
NOID"

ENGINE SIGNAL 1
[C1210]

Malfunction has been detected from ECM.

TF-28, "DTC C1210 EN-
GINE SIGNAL 1"

CAN COMM CIRCUIT
[U1000]

When AWD control unit is not transmitting or receiving CAN commu-
nication signal for 2 seconds or more.

TF-28, "DTC U1000 CAN
COMM CIRCUIT"

NO DTC IS DETECTED.
FURTHER TESTING MAY BE
REQUIRED.

No NG item has been detected.

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