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.

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.

>> GO TO 6.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform AWD control unit self-diagnosis.

Check malfunction detected by self-diagnosis.

Erase AWD control unit self-diagnostic results.

>> GO TO 4.

CHECK TERMINALS AND HARNESS CONNECTORS

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

>> GO TO 5.

CHECK SYMPTOM REPRODUCTION

With CONSULT-III

Perform DTC reproduction procedure for the error system.

Is any error detected?

YES

>> GO TO 2.

>> GO TO 6.

PERFORM SYMPTOM DIAGNOSIS

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

YES

>> GO TO 2.

>> GO TO 7.

FINAL CHECK

With CONSULT-III

Check input/output signal standard of AWD control unit.

Is the input/output the standard value?

YES

>> INSPECTION END

>> GO TO 2.

Revision: 2008 October

2009 Murano

AWD SYSTEM

DLN-5

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

DLN

FUNCTION DIAGNOSIS

AWD SYSTEM

System Diagram

INFOID:0000000003302034

CONTROL DIAGRAM

CROSS-SECTIONAL VIEW

JSDIA0955GB

Revision: 2008 October

2009 Murano

DLN-6

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

AWD SYSTEM

System Description

INFOID:0000000003302035

DESCRIPTION

• AWD controls distribution of drive power between front-wheel drive (100:0) and 4-wheel drive (50:50) condi-

tions according to signals from sensors.

• By receiving the steering angle sensor signal, yaw rate sensor signal, side G sensor signal and decel G sen-

sor signal, vehicle with VDC corrects a torque distribution for front and rear wheels according to a driving
operation and a behavior of the vehicle during cornering and improves drivability and safety on a slippery
road surface.

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

Adapter case

Transfer case

Gear ring bearing (Transfer case side)

Pinion front bearing

Pinion sleeve

Drive pinion

Companion flange

Pinion rear bearing

Drive gear

10. Gear ring bearing (Adapter case side)

JPDIE0015ZZ

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)
• Yaw rate sensor signal
• Side G sensor signal
• Decel G sensor signal

ECM

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

Revision: 2008 October

2009 Murano

AWD SYSTEM

DLN-7

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

DLN

AUTO Mode

• Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
• AWD mode makes possible stable driving possible with no wheel spin, on snowy roads or other slippery sur-

faces.

• On roads which do not require 4-wheel drive, AUTO mode contributes to improved fuel economy by driving

in conditions close to front-wheel drive.

• Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distrib-

uting optimum torque to rear wheels.

NOTE:
Light tight-corner braking symptom may occur depending on driving condition in AUTO mode. This is not mal-
function.

LOCK Mode

• Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes.
• Vehicle will switch automatically to AUTO mode if vehicle speed increases. If vehicle speed then decreases,

the vehicle automatically returns to direct 4-wheel driving conditions. The AWD LOCK indicator lamp keeps
illuminating.

• LOCK mode will change to AUTO mode automatically, when the vehicle has been driven at a high speed.

The AWD LOCK indicator lamp turns off.

• LOCK mode will change to AUTO mode automatically, when the ignition switch is turned “OFF”.
NOTE:
• Every time AWD LOCK switch is pressed, AUTO mode and LOCK mode switch each other.
• If there is a significant difference in pressure or wear between tires, full vehicle performance is not available.

Tire conditions are detected, and LOCK mode may be prohibited, or else speeds at which LOCK mode is
enabled may be restricted.

• Heavy tight-corner braking symptom occurs when vehicle is driven in the following conditions: LOCK mode,

steering wheel is turned fully to either sides, and accelerator pedal is depressed.

CAUTION:

Never switch to LOCK when rotation speed of front and rear wheel differs.

POWER TRANSFER DIAGRAM

OPERATION PRINCIPLE

Electric Controlled Coupling

Combination meter

Transmits conditions of parking brake switch signal via CAN communication to AWD con-
trol unit.

Receives the following signals via CAN communication from AWD control unit.
• AWD warning lamp signal
• AWD LOCK indicator lamp signal

Steering angle sensor

Transmits conditions of steering angle sensor signal via CAN communication to AWD
control unit.

Component parts

Function

SDIA1607E

Revision: 2008 October

2009 Murano

DLN-8

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

AWD SYSTEM

The AWD control unit supplies command current to electric con-
trolled coupling (AWD solenoid).

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

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

The main clutch transmits torque to front wheels according to
pressing power.

• Transmission torque to the rear wheels is determined accord-

ing to command current.

Component Parts Location

INFOID:0000000003302036

SDIA2035E

SDIA1844E

AWD LOCK indicator lamp

AWD warning lamp

AWD lock switch

AWD control unit

AWD solenoid (in rear final drive)

Combination meter

Center console (Front side)

Instrument driver lower cover removed

Rear final drive assembly

JPDIE0052ZZ

Revision: 2008 October

2009 Murano

AWD SYSTEM

DLN-9

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

DLN

Component Description

INFOID:0000000003352080

Component parts

Reference/Function

AWD control unit

DLN-12, "Description"

Wheel sensors

BRC-34, "Description"

AWD solenoid

DLN-14, "Description"

Electric controlled coupling

Transmits driving force to rear final drive.

AWD warning lamp

DLN-24, "Description"

AWD LOCK indicator lamp

DLN-26, "Description"

AWD lock switch

DLN-22, "Description"

ABS actuator and electric unit (control unit)

DLN-13, "Description"

ECM

DLN-17, "Description"

Combination meter

DLN-26, "Description"

Steering angle sensor

BRC-66, "Description"

Revision: 2008 October

2009 Murano

DLN-10

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

DIAGNOSIS SYSTEM (AWD CONTROL UNIT)

DIAGNOSIS SYSTEM (AWD CONTROL UNIT)

CONSULT-III Function

INFOID:0000000003302038

FUNCTION

CONSULT-III can display each diagnostic item using the diagnostic test modes as follows.

ECU IDENTIFICATION

AWD control unit part number can be read.

SELF -DIAGNOSTIC RESULT

Before performing the self-diagnosis, start the engine and drive vehicle at 30 km/h (19 MPH) or more for
approximately 1 minute.

Display Item List

Refer to

DLN-33, "DTC Index"

How to Erase Self-Diagnostic Results

Before erasing DTC memory, start the engine and drive at 30 km/h (19 MPH) or more for approximately 1
minute. Check that ABS warning lamp turns OFF.
NOTE:
When AWD warning lamp is ON with system malfunction of DTC “C1203”, run the vehicle at 30 km/h (19
MPH) or more for a minute and check that ABS warning lamp is turned OFF. Then turn ignition switch OFF,
and start the engine again. Otherwise AWD warning lamp may not turned OFF even if it is normal.

DATA MONITOR

Display Item List

ACTIVE TEST

Description

Diagnostic test mode

Function

ECU Identification

AWD control unit part number can be read.

Self Diagnostic Result

Self-diagnostic results can be read and erased quickly.

Data Monitor

Input/Output data in the AWD control unit 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.

Monitor item (Unit)

Remarks

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/LOCK]

Mode switch is not equipped, but displayed.

4WD MODE MON [AUTO/LOCK]

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.

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

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

Wheel speed calculated by front RH wheel sensor signal is displayed.

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

Wheel speed calculated by front LH wheel sensor signal is displayed.

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

Wheel speed calculated by rear RH wheel sensor signal is displayed.

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

Wheel speed calculated by rear LH wheel sensor signal is displayed.

Revision: 2008 October

2009 Murano

DIAGNOSIS SYSTEM (AWD CONTROL UNIT)

DLN-11

< FUNCTION DIAGNOSIS >

[TRANSFER: TY20A]

DLN

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 energize continuously for a long time.

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 approx.

10% of command val-

ue.)
• Qu: Increase current value in increments of 0.2 A
• Qd: Decrease current value in increments of 0.2 A
• UP: Increase current value in increments of 0.02 A
• DOWN: Decrease current value in increments of 0.02 A

Revision: 2008 October

2009 Murano

DLN-12

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

C1201 AWD CONTROL UNIT

COMPONENT DIAGNOSIS

C1201 AWD CONTROL UNIT

Description

INFOID:0000000003302039

• Controls driving force distribution by signals from each sensor from front wheel driving mode (100:0) to 4-

wheel driving mode (50:50).

• Front wheel driving conditions is available by fail-safe function if malfunction is detected in AWD system.

DTC Logic

INFOID:0000000003302040

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Turn the ignition switch OFF to ON.

Perform AWD control unit self-diagnosis.

Is DTC “C1201” detected?

YES

>> Proceed to diagnosis procedure. Refer to

DLN-12, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003302041

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Erase AWD control unit self-diagnostic results.

Turn the ignition switch OFF, and then wait 10 seconds or more.

Perform AWD control unit self-diagnosis.

Is DTC “C1201” detected?

YES

>> Replace AWD control unit. Refer to

DLN-47, "Exploded View"

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1201

CONTROLLER FAILURE

Malfunction has occurred inside AWD
control unit.

Internal malfunction of AWD control unit

Revision: 2008 October

2009 Murano

C1203 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

DLN-13

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

DLN

C1203 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Description

INFOID:0000000003302042

• Transmits the following signals via CAN communication to AWD control unit.
- Vehicle speed signal
- Stop lamp switch signal (brake signal)
- Yaw rate sensor signal
- Side G sensor signal
- Decel G sensor signal

DTC Logic

INFOID:0000000003302043

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Start the engine and drive at 30 km/h (19 MPH) or more for approximately 1 minute.

Perform AWD control unit self-diagnosis.

Is DTC “C1203” detected?

YES

>> Proceed to diagnosis procedure. Refer to

DLN-13, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003302044

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

With CONSULT-III

Perform ABS actuator and electric unit (control unit) self-diagnosis.
Is any DTC detected?

YES

>> Check the DTC.

>> GO TO 2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Erase AWD control unit self-diagnostic results.

Start the engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute.

Check that ABS warning lamp turns OFF.

Perform AWD control unit self-diagnosis.

Is DTC “C1203” detected?

YES

>> Replace AWD control unit. Refer to

DLN-47, "Exploded View"

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1203

ABS SYSTEM

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

ABS malfunction
• Malfunction of ABS actuator and elec-

tric unit (control unit)

• Vehicle speed signal error

Revision: 2008 October

2009 Murano

DLN-14

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

C1204 AWD SOLENOID

C1204 AWD SOLENOID

Description

INFOID:0000000003302045

Controls electric controlled coupling by command current from AWD control unit.

DTC Logic

INFOID:0000000003302046

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Turn the ignition switch OFF to ON.

Perform AWD control unit self-diagnosis.

Is DTC “C1204” detected?

YES

>> Proceed to diagnosis procedure. Refer to

DLN-14, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003302047

CHECK AWD SOLENOID POWER SUPPLY

Turn the ignition switch OFF.

Disconnect AWD control unit harness connector.

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

Is the inspection result normal?

YES

>> GO TO 2.

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

DLN-20, "Diagnosis Procedure"

CHECK AWD SOLENOID GROUND

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

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair or replace error-detected parts.

CHECK AWD SOLENOID CIRCUIT

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

DTC

Display item

Malfunction detected condition

Possible cause

C1204

4WD SOLENOID

Malfunction related to AWD solenoid has
been detected.

• Internal malfunction of electronic con-

trolled coupling

• Malfunction of AWD solenoid power

supply circuit (open or short)

• Malfunction of AWD solenoid com-

mand current

AWD control unit

—

Voltage

Connector

Terminal

M69

Ground

Battery voltage

AWD control unit

—

Continuity

Connector

Terminal

M69

Ground

Existed

Revision: 2008 October

2009 Murano

C1204 AWD SOLENOID

DLN-15

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

DLN

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

Check the continuity between AWD solenoid harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace error-detected parts.

CHECK AWD SOLENOID

Check AWD solenoid. Refer to

DLN-15, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 5.

>> AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to

DLN-98, "Exploded

View"

CHECK TERMINALS AND HARNESS CONNECTORS

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

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

Is the inspection result normal?

YES

>> Replace AWD control unit. Refer to

DLN-47, "Exploded View"

>> Repair or replace error-detected parts.

Component Inspection

INFOID:0000000003302048

CHECK AWD SOLENOID

Turn the ignition switch OFF.

Disconnect AWD solenoid harness connector.

Check the resistance between AWD solenoid harness connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

>> AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to

DLN-98, "Exploded

View"

AWD control unit

AWD solenoid

Continuity

Connector

Terminal

Connector

Terminal

M69

Existed

AWD control unit

—

Continuity

Connector

Terminal

M69

Ground

Not existed

AWD solenoid

—

Continuity

Connector

Terminal

Ground

Not existed

AWD solenoid

Resistance (Approx.)

Connector

Terminal

2.45

Ω

Revision: 2008 October

2009 Murano

DLN-16

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

C1205 AWD ACTUATOR RELAY

C1205 AWD ACTUATOR RELAY

Description

INFOID:0000000003302049

AWD solenoid is supplied with voltage by the internal circuit of AWD control unit.

DTC Logic

INFOID:0000000003302050

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Turn the ignition switch OFF to ON.

Perform AWD control unit self-diagnosis.

Is DTC “C1205” detected?

YES

>> Proceed to diagnosis procedure. Refer to

DLN-16, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003302051

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Erase AWD control unit self-diagnostic results.

Turn ignition switch OFF, and wait 10 seconds or more.

Perform AWD control unit self-diagnosis.

Is DTC “C1205” detected?

YES

>> Replace AWD control unit. Refer to

DLN-47, "Exploded View"

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1205

4WD ACTUATOR RLY

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

Internal malfunction of AWD control unit

Revision: 2008 October

2009 Murano

C1210 ECM

DLN-17

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

DLN

C1210 ECM

Description

INFOID:0000000003302052

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

DTC Logic

INFOID:0000000003302053

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Start the engine. Drive the vehicle for a while.

Perform AWD control unit self-diagnosis.

Is DTC “C1210” detected?

YES

>> Proceed to diagnosis procedure. Refer to

DLN-17, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003302054

PERFORM ECM SELF-DIAGNOSIS

With CONSULT-III

Perform ECM self-diagnosis.

Is any DTC detected?

YES

>> Check the DTC.

>> GO TO 2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Erase AWD control unit self-diagnostic results.

Turn the ignition switch OFF.

Start the engine. Drive the vehicle for a while.

Check that malfunction indicator lamp (MIL) turns OFF.

Stop the vehicle. Perform AWD control unit self-diagnosis.

Is DTC “C1210” detected?

YES

>> Replace AWD control unit. Refer to

DLN-47, "Exploded View"

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1210

ENGINE SIGNAL 1

Malfunction related to engine signal has
been detected.

Malfunction of engine control system

Revision: 2008 October

2009 Murano

DLN-18

< COMPONENT DIAGNOSIS >

[TRANSFER: TY20A]

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000003302061

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000003302062

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Turn the ignition switch OFF to ON.

Perform AWD control unit self-diagnosis.

Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to

DLN-18, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003302063

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform AWD control unit self-diagnosis.

Is DTC “U1000” detected?

YES

>> CAN specification chart. Refer to

LAN-16, "Trouble Diagnosis Flow Chart"

>> INSPECTION END

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

AWD control unit is not transmitting/re-
ceiving CAN communication signal for 2
seconds or more.

• CAN communication error
• Malfunction of AWD control unit

Revision: 2008 October

2009 Murano

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