Infiniti G35 (V35) Sedan. Manual - part 394

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< FUNCTION DIAGNOSIS >

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AWD SYSTEM

• 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
engine is turned OFF.)

• If the warning lamp blinks slowly during driving but remains OFF after engine is restarted, the system is nor-

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

• When the difference of revolution speed between the front and rear wheel the shift occasionally changes to

direct 4-wheel driving conditions automatically. This is not 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.

Main clutch transmits torque to front wheels according to pressing power.
• Transmission torque to front wheels is determined according

to command current.

Component Parts Location

INFOID:0000000000957228

SDIA2270E

SDIA1844E

1.

AWD warning lamp

2.

AWD control unit

3.

AWD solenoid harness connector

JSDIA0049ZZ

AWD SYSTEM

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< FUNCTION DIAGNOSIS >

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Component Description

INFOID:0000000000957229

A.

Combination meter

B.

Glove box assembly removed

C.

Transfer assembly

Component parts

Reference/Function

AWD control unit

DLN-14, "Description"

Wheel sensors

Detects wheel speed.

AWD solenoid

DLN-16, "Description"

Electric controlled coupling

Transmits driving force to front final drive.

AWD warning lamp

DLN-25, "Description"

ABS actuator and electric unit (control unit)

DLN-15, "Description"

ECM

DLN-20, "Description"

Unified meter and A/C amp.

Transmits conditions of parking brake switch via CAN communica-
tion to AWD control unit.

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< FUNCTION DIAGNOSIS >

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DIAGNOSIS SYSTEM (AWD CONTROL UNIT)

DIAGNOSIS SYSTEM (AWD CONTROL UNIT)

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

INFOID:0000000000957230

FUNCTION

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

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]” or “CONTROL UNIT (CAN) [U1010]” 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.

Check that 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 malfunction of “ABS

Diagnostic test mode

Function

Self-diagnostic results

• Self-diagnostic results can be read and erased quickly.

Data monitor

• Input/Output data in the AWD control unit can be read.

CAN diagnostic support monitor

• The results of transmit/receive diagnosis of CAN communication can be read.

Active test

• Diagnostic Test Mode in which CONSULT-III drives some actuators apart from the AWD control 

unit and also shifts some parameters in a specified range.

ECU part number

• AWD control unit part number can be read.

Items 

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

CONTROLLER FAILURE
[C1201]

Malfunction has occurred inside AWD control unit.

Internal malfunction of AWD 
control unit

ABS SYSTEM
[C1203]

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

ABS malfunction
• Vehicle speed signal error
• Stop lamp switch signal 

(brake signal) error

4WD SOLENOID
[C1204]

Malfunction related to AWD solenoid has been detected.

Internal malfunction of elec-
tronic controlled coupling

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 de-
tected.

Internal malfunction of AWD 
control unit

ENGINE SIGNAL 1
[C1210]

Malfunction has been detected from ECM.

Malfunction of engine control 
system
• Accelerator pedal position 

signal error

• Engine speed signal error

CAN COMM CIRCUIT
[U1000]

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

CAN communication line error

CONTROL UNIT (CAN)
[U1010]

When detecting error during the initial diagnosis of CAN controller of 
AWD control unit.

AWD control unit error

NO DTC IS DETECTED.
FURTHER TESTING MAY 
BE REQUIRED.

No NG item has been detected.

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DIAGNOSIS SYSTEM (AWD CONTROL UNIT)

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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

×

: Standard

❏

: Optional item

ACTIVE TEST MODE

Description

• Use this mode to determine and identify the details of a malfunction based on self-diagnostic results or data

monitor. AWD control unit gives drive signal to actuator with receiving command from CONSULT-III to check
operation of actuator.

Test Item

CAUTION:

Never continuously energize for a long time.

Monitor item (Unit)

Monitor Menu

Remarks

ECU INPUT 

SIGNALS

MAIN

SIGNALS

FR RH SENSOR [km/h] or [mph]

×

×

Wheel speed calculated by front wheel sensor RH sig-
nal is displayed.

FR LH SENSOR [km/h] or [mph]

×

×

Wheel speed calculated by front wheel sensor LH sig-
nal is displayed.

RR RH SENSOR [km/h] or [mph]

×

×

Wheel speed calculated by rear wheel sensor RH sig-
nal is displayed.

RR LH SENSOR [km/h] or [mph]

×

×

Wheel speed calculated by rear wheel sensor LH sig-
nal is displayed.

BATTERY VOLT [V]

❏

❏

Power supply voltage for AWD control unit

THRTL POS SEN [%]

❏

❏

Throttle opening status is displayed.

ETS SOLENOID [A]

❏

❏

Monitored value of current at AWD solenoid

STOP LAMP SW [On/Off]

❏

❏

Stop lamp switch signal status via CAN communication 
line is displayed.

ENG SPEED SIG [Run/Stop]

❏

❏

Engine status is displayed.

ETS ACTUATOR [On/Off]

❏

❏

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

4WD WARN LAMP [On/Off]

❏

❏

Control status of AWD warning lamp is displayed.

4WD MODE SW [AUTO]

❏

❏

Mode switch is not equipped, but displayed.

4WD MODE MON [AUTO]

❏

❏

Control status of AWD is displayed.

DIS-TIRE MONI [mm]

❏

❏

Improper size tire installed condition is displayed.

P BRAKE SW [On/Off]

❏

❏

Parking switch signal status via CAN communication 
line is displayed.

Test item

Condition

Description

ETS S/V
(Detects AWD solenoid)

• Vehicle stopped
• Engine running
• No DTC detected

• Change command current value to AWD solenoid, and then change driving 

mode. (Monitor value is normal if it is within approximately 

±

10% of com-

mand value.)
Qu: Increase current value in increments of 0.20 A
Qd: Decrease current value in increments of 0.20 A
UP: Increase current value in increments of 0.02 A
DOWN: Decrease current value in increments of 0.02 A