Infiniti QX56 (Z62). Manual — part 473
DLN-92
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
U1010 CONTROL UNIT (CAN)
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000006222303
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:0000000006222304
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “U1010” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222305
1.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit harness connector for disconnection and deformation.
Is the inspection result normal?
YES
>> Replace transfer control unit. Refer to
DLN-107, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
DTC
Display item
Malfunction detected condition
Possible cause
U1010
CONTROL UNIT (CAN)
Detecting error during the initial diagno-
sis of CAN controller of transfer control
unit.
Malfunction of transfer control unit
POWER SUPPLY AND GROUND CIRCUIT
DLN-93
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
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POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000006222306
Supplies power to 4WD system.
Diagnosis Procedure
INFOID:0000000006222307
1.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
1.
Turn the ignition switch OFF.
2.
Disconnect transfer control unit harness connector.
3.
Check the voltage between transfer control unit harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
1.
Turn the ignition switch OFF.
2.
Check the 10A fuse (#34).
3.
Check the harness for open or short between transfer control unit harness connector No.20 terminal and
10A (#34).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit. Refer to
NO
>> Repair or replace error-detected parts.
3.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
1.
Turn the ignition switch OFF.
2.
Check the voltage between transfer control unit harness connector and ground.
3.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
4.
Check the voltage between transfer control unit harness connector and ground.
Transfer control unit
—
Voltage
Connector
Terminal
E59
20
Ground
Battery voltage
Transfer control unit
—
Voltage
Connector
Terminal
E59
20
Ground
Battery voltage
Transfer control unit
—
Voltage
Connector
Terminal
E59
32
Ground
Approx. 0 V
Transfer control unit
—
Voltage
Connector
Terminal
E59
32
Ground
Battery voltage
DLN-94
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
1.
Turn the ignition switch OFF.
2.
Check the 10A fuse (#56).
3.
Disconnect IPDM E/R harness connector.
4.
Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5.
Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit. Refer to
.
NO
>> Repair or replace error-detected parts.
5.
CHECK TRANSFER MOTOR POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Check the voltage between transfer control unit harness connector and ground.
3.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
4.
Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
CHECK TRANSFER MOTOR POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check the 30A fusible link (J).
3.
Check the harness for open or short between transfer control unit harness connector No.41 terminal and
30A fusible link (J).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit. Refer to
NO
>> Repair or replace error-detected parts.
7.
CHECK 4WD SWITCH ASSEMBLY POWER SUPPLY (1)
1.
Turn the ignition switch OFF.
IPDM E/R
Transfer control unit
Continuity
Connector
Terminal
Connector
Terminal
E15
58
E59
32
Existed
Transfer control unit
—
Continuity
Connector
Terminal
E59
32
Ground
Not existed
Transfer control unit
—
Voltage
Connector
Terminal
E60
41
Ground
Battery voltage
Transfer control unit
—
Voltage
Connector
Terminal
E60
41
Ground
Battery voltage
POWER SUPPLY AND GROUND CIRCUIT
DLN-95
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
C
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DLN
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2.
Disconnect 4WD switch assembly harness connector.
3.
Check the voltage between 4WD switch assembly harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between 4WD switch assembly harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
CHECK 4WD SWITCH ASSEMBLY POWER SUPPLY (2)
1.
Turn the ignition switch OFF.
2.
Check the 10A fuse (#13).
3.
Disconnect fuse block (J/B) harness connector.
4.
Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5.
Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit. Refer to
NO
>> Repair or replace error-detected parts.
9.
CHECK TRANSFER CONTROL UNIT GROUND
1.
Turn the ignition switch OFF.
2.
Check the voltage between transfer control unit harness connector and ground.
3.
Check the continuity between transfer control unit harness connector and ground.
4WD switch assembly
—
Voltage
Connector
Terminal
M54
12
Ground
Approx. 0 V
4WD switch assembly
—
Voltage
Connector
Terminal
M54
12
Ground
Battery voltage
Fuse block (J/B)
4WD switch assembly
Continuity
Connector
Terminal
Connector
Terminal
M3
10C
M54
12
Existed
4WD switch assembly
—
Continuity
Connector
Terminal
M54
12
Ground
Not existed
Transfer control unit
—
Voltage
Connector
Terminal
E60
44
Ground
Approx. 0 V
46
Transfer control unit
—
Continuity
Connector
Terminal
E60
44
Ground
Existed
46
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