2011 INFINITI QX56 engine

TRANSFER CONTROL UNITDLN-27
< ECU DIAGNOSIS INFORMATION > [TRANSFER: ATX90A]
C
EF
G H
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M A
B
DLN
N
O P
7
(Y) Ground
Transfer fluid tempera-
ture sensor power supply Input Engine running 0 – 5V
9
(G) Ground Transfer internal speed
sensor (GND) —Always 0 V
10
(Y/G) Ground Transfer internal speed
sensor (IMP)
Input IGN ON Transfer motor driving
11
(V) Ground 4WD shift SW (4Lo) Input IGN ON 4WD shift switch: 4L Battery voltage
4WD shift switch: Except
4L
0 V
12
(L) —CAN-H Input/
Output ——
13
(P) —CAN-L
Input/
Output ——
14
(W/R) Ground 4WD shift SW (AUTO) Input IGN ON 4WD shift switch: AUTO Battery voltage
4WD shift switch: Except
AUTO
0 V
15
(P/B) Ground Transfer rotary position
sensor (PWM)
Input IGN ON
16
(LG) Ground
Transfer rotary position
sensor (GND) —Always 0 V
17
(W/L) Ground Transfer lock position
sensor power supply InputIGN ON 5V
10 seconds or more later after ignition
switch turned OFF 0V
18
(BR/Y) Ground Transfer rotary position
sensor power supply
InputIGN ON 5V
10 seconds or more later after ignition
switch turned OFF 0V
20
(GR) Ground
Transfer control unit pow-
er supply Input Always Battery voltage
25
(P/L) Ground Hi-Lo position sensor 3 Input/
Output Engine
running
(Never
drive the
vehicle.) 4WD mode: AUTO or 4H 0 V
4WD mode: Shifting 5 V
4WD mode: 4L 5 V
28
(W) Ground
Transfer motor tempera-
ture sensor power supply InputIGN ON 0 – 5V
IGN OFF 0V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
+ - Signal name Input/
Output
JPDIE0267GB
JPDIE0268GB
Revision: 2010 May2011 QX56

DLN-28
< ECU DIAGNOSIS INFORMATION >[TRANSFER: ATX90A]
TRANSFER CONTROL UNIT
CAUTION:
When using circuit tester to measure voltage for in
spection, be sure not to extend forcibly any con-
nector terminals.
Fail-SafeINFOID:0000000006222228
 If any malfunction occurs in 4WD electrical system, and control unit detects the malfunction, 4WD warning
lamp on combination meter turns ON to indicate system malfunction.
 When 4WD warning lamp is ON, vehicle changes to rear-wheel drive or shifts to 4-wheel drive (front-wheels
still have some driving torque).
29
(LG/R) Ground Hi-Lo position sensor 2
Input/
Output Engine
running
(Never
drive the
vehicle.)
Always 0 V
30
(R/B) Ground Transfer lock position
sensor (GND) —Always 0 V
31
(L/O) Ground Transfer internal speed
sensor (DIR)
Input IGN ONWhen changing the trans-
fer motor rota
tion direc-
tion.
32
(BR/R) Ground IGN SW Input IGN ON Battery voltage
IGN OFF 0V
35
(R) Ground 4WD shift SW (4H) Input IGN ON 4WD shift switch: 4H Battery voltage
4WD shift switch: Except
4H
0 V
36
(L/R) Ground Transfer fluid tempera-
ture sensor (GND)
—Always 0 V
38
(G/O) Ground
Transfer lock position
sensor signal Input IGN ON
39
(R/W) Ground Transfer internal speed
sensor power supply
InputIGN ON 8 V
IGN OFF 0V
41
(W/R) Ground Transfer control actuator
power supply Input Always Battery voltage
43
(G/R) Ground Motor drive B Input/
Output Transfer motor driving 0V - Battery voltage
44
(B) Ground GND — Always 0 V
45
(G/Y) Ground Motor drive A Input/
Output Transfer motor driving 0V - Battery voltage
46
(B) Ground Transfer control actuator
(GND)
—Always 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
+ - Signal name Input/
Output
JPDIE0269GB
JPDIE0268GB
Revision: 2010 May2011 QX56

TRANSFER CONTROL UNITDLN-29
< ECU DIAGNOSIS INFORMATION > [TRANSFER: ATX90A]
C
EF
G H
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J
K L
M A
B
DLN
N
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DTC Inspection Priority ChartINFOID:0000000006222229
If some DTCs are displayed at the same time, per form inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000006222230
Priority Detected items (DTC)
1  U1000 CAN COMM CIRCUIT
 U1010 CONTROL UNIT (CAN)
2  P1802 CONTROL UNIT 1
 P1803 CONTROL UNIT 2
 P1804 CONTROL UNIT 3
 P1809 CONTROL UNIT 4
 P180C SEN POWER SUPPLY (5V)
 P180E SEN POWER SUPPLY (8V)
 P1811 BATTERY VOLTAGE
 P181B INCOMP SELFSHUT
 P181C MOTOR POWER SUPPLY
 P181F INCOMP CALIBRATION
3  P1807 VECL SPEED SEN-AT
 P1808 VECL SPEED SEN-ABS
 P1816 PNP SW/CIRC
 P181E ST ANGLE SEN SIG
 P1820 ENGINE SPEED SIG
 P1829 THROTTLE POSI SEN
 P1830 ABS OP SIG
 P1831 VDC OP SIG
 P1832 TCS OP SIG
4  P180D ROTARY POSITION SEN
 P1813 4WD MODE SW
 P181A MOTOR TEMP SEN
 P1826 OIL TEMP SEN
 P182A HI-LO POSITION SEN
 P182B LOCK POSITION SEN
5  P180F MOTOR SYSTEM
 P1817 SHIFT ACTUATOR
DTC Display Items Reference
P1802 CONTROL UNIT 1 DLN-51, "
DTC Logic"
P1803 CONTROL UNIT 2DLN-51, "DTC Logic"
P1804 CONTROL UNIT 3DLN-51, "DTC Logic"
P1807 VHCL SPEED SEN-ATDLN-52, "DTC Logic"
P1808 VHCL SPEED SEN-ABSDLN-53, "DTC Logic"
P1809 CONTROL UNIT 4DLN-51, "DTC Logic"
P180C SEN POWER SUPPLY (5V) DLN-54, "DTC Logic"
P180D ROTARY POSITION SENDLN-57, "DTC Logic"
P180E SEN POWER SUPPLY (8V)DLN-59, "DTC Logic"
P180F MOTOR SYSTEMDLN-61, "DTC Logic"
P1811 BATTERY VOLTAGEDLN-64, "DTC Logic"
P1813 4WD MODE SW DLN-67, "DTC Logic"
P1816 PNP SW/CIRCDLN-69, "DTC Logic"
P1817 SHIFT ACTUATORDLN-70, "DTC Logic"
P181A MOTOR TEMP SEN DLN-72, "DTC Logic"
P181B IMCOMP SELFSHUTDLN-74, "DTC Logic"
Revision: 2010 May2011 QX56

DLN-30
< ECU DIAGNOSIS INFORMATION >[TRANSFER: ATX90A]
TRANSFER CONTROL UNIT
P181C MOTOR POWER SUPPLY
DLN-76, "DTC Logic"
P181E ST ANGLE SEN SIGDLN-77, "DTC Logic"
P181F INCOMP CALIBRATIONDLN-78, "DTC Logic"
P1826 OIL TEMP SENDLN-80, "DTC Logic"
P1820 ENGINE SPEED SIGDLN-79, "DTC Logic"
P1829 THROTTLE POSI SENDLN-82, "DTC Logic"
P182A HI-LO POSITION SEN DLN-83, "DTC Logic"
P182B LOCK POSITION SENDLN-85, "DTC Logic"
P1830 ABS OP SIGDLN-88, "DTC Logic"
P1831 VDC OP SIGDLN-89, "DTC Logic"
P1832 TCS OP SIGDLN-90, "DTC Logic"
U1000 CAN COMM CIRCUIT DLN-91, "DTC Logic"
U1010 CONTROL UNIT (CAN)DLN-92, "DTC Logic"
DTC Display Items Reference
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORK FLOWDLN-39
< BASIC INSPECTION > [TRANSFER: ATX90A]
C
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DLN
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YES >> GO TO 7.
NO >> Check harness and connectors based on the in formation obtained by interview. Refer to GI-40,
"Intermittent Incident".
7.FINAL CHECK
With CONSULT-III
1. Check the reference value for “ALL MODE AWD/4WD”.
2. Recheck the symptom and check that symptom is not reproduced on the same conditions.
Is the symptom reproduced?
YES >> GO TO 3.
NO >> INSPECTION END
Diagnostic Work SheetINFOID:0000000006222233
Description
 In general, customers have their own criteria for a pr oblem. Therefore, it is important to understand the
symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the in terview sheet referring to the interview points.
 In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.
Interview sheet sample
Interview sheet
Customer
name MR/MSRegistration
number
Initial year reg-
istration
Vehicle type VIN
Storage
date Engine Mileage km ( Mile)
Symptom †
Vehicle does not enter 4WD mode.
† 4WD warning la mp turns on.
† Heavy tight-corner braking symptom occurs
† Noise †Vibration
† Others
( )
First occurrence †Recently †Others ( )
Frequency of occurrence †Always †Under a certain conditions of †Sometimes (time(s)/day)
Climate
conditions †
Irrelevant
Weather †Fine †Cloud †Rain †Snow †Others ( )
Temperature †Hot †Warm †Cool †Cold †Temperature [Approx. °C ( °F)]
Relative humidity †High †Moderate †Low
Road conditions †
Urban area †Suburb area †High way
† Mounting road (uphill or down hill) †Rough road
Operation conditions, etc. †
Irrelevant
† When engine starts †During idling
† During driving †During acceleration †At constant speed driving
†During deceleration †During cornering (right curve or left curve)
Revision: 2010 May2011 QX56

DLN-40
< BASIC INSPECTION >[TRANSFER: ATX90A]
DIAGNOSIS AND REPAIR WORK FLOW
Other conditions
MemoInterview sheet
Customer
name MR/MSRegistration
number
Initial year reg-
istration
Vehicle type VIN
Storage
date Engine Mileage km ( Mile)
Revision: 2010 May2011 QX56

ADDITIONAL SERVICE WHEN REPLACING TRANSFER CONTROL UNIT
DLN-41
< BASIC INSPECTION > [TRANSFER: ATX90A]
C
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G H
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K L
M A
B
DLN
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ADDITIONAL SERVICE WHEN RE PLACING TRANSFER CONTROL UNIT
DescriptionINFOID:0000000006222234
Perform writing unit parameter and initial calibration after replacing transfer control unit. Refer to DLN-41,
"Work Procedure".
Work ProcedureINFOID:0000000006222235
NOTE:
In fail-safe mode, can not perform work support. (Except that DTC P181F is detected.)
1.WRITE UNIT PARAMETER
Perform writing unit parameter to control unit. Refer to DLN-48, "
Work Procedure".
>> GO TO 2.
2.INITIAL CALIBRATION (1)
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER VHCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
Does the transfer motor operate automatically?
YES >> After the transfer motor operation st op (After approximately 10 seconds) GO TO 4.
NO >> GO TO 3.
3.INITIAL CALIBRATION (2)
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF. CAUTION:
Wait for 10 seconds after turning ignition switch OFF.
3. Start the engine.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is
“DTC P181F” detected?
YES >> GO TO 1.
NO >> WORK END
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

DLN-42
< BASIC INSPECTION >[TRANSFER: ATX90A]
ADDITIONAL SERVICE WHEN
REPLACING TRANSFER ASSEMBLY
ADDITIONAL SERVICE WHEN REPLACING TRANSFER ASSEMBLY
DescriptionINFOID:0000000006222236
Perform writing unit parameter, transfer fluid viscosity learning and initial calibration after replacing transfer
assembly. Refer to DLN-42, "
Work Procedure".
Work ProcedureINFOID:0000000006222237
NOTE:
In fail-safe mode, can not perform work s upport. (Except that DTC P181F is detected.)
1.WRITE UNIT PARAMETER
Perform writing unit parameter to control unit. Refer to DLN-48, "
Work Procedure".
>> GO TO 2.
2.PREPARATION BEFORE WORK
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER V HCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
>> GO TO 3.
3.PERFORM TRANSFER FLUID VISCOSITY LEARNING
With CONSULT-III
1. Select “OIL DETERIORATION INFO RESET” of CONSULT-III “WORK SUPPORT” for “ALL MODE AWD/
4WD”.
2. Select “Start”.
>> GO TO 4.
4.INITIAL CALIBRATION
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 5.
5.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF. CAUTION:
Wait for 10 seconds after turn ing ignition switch OFF.
3. Start the engine. CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56