Nissan X-Trail 32. Manual — part 862
U1001 CAN COMM CIRCUIT
EC-577
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
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U1001 CAN COMM CIRCUIT
Description
INFOID:0000000010986294
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 transmits/receives data but selectively reads required data only.
DTC Description
INFOID:0000000010986295
DTC DETECTION LOGIC
POSSIBLE CAUSE
Harness or connectors (CAN communication line is open or shorted)
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010986296
Perform the trouble diagnosis for CAN communication system. Refer to
LAN-17, "Trouble Diagnosis Flow
.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
U1001
CAN COMM CIRCUIT
(CAN COMM CIRCUIT)
When ECM is not transmitting or receiving CAN communication signal oth-
er than OBD (emission related diagnosis) for 2 seconds or more.
EC-578
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
U1040 ENG COMM CIRCUIT
U1040 ENG COMM CIRCUIT
DTC Description
INFOID:0000000010986297
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness or connectors
(LIN communication circuit is open or shorted.)
• ECM
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted. always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition ON and wait at least 10 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010986298
1.
CHECK LIN COMMUNICATION CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and generator harness connector.
3.
Check the continuity between ECM harness connector and generator harness connector.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
REPLACE GENERATOR
1.
Replace generator. Refer to
CHG-46, "QR25DE : Removal and Installation"
.
2.
Erase DTC.
3.
Perform DTC confirmation procedure again. Refer to
.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
U1040
ENG COMM CIRCUIT
(Engine communication circuit)
ECM cannot transmit a communication signal to generator.
+
−
Continuity
ECM
Generator
Connector
Terminal
Connector
Terminal
F68
85
F15
2
Existed
U1040 ENG COMM CIRCUIT
EC-579
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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Is DTC detected again?
YES
>> Replace ECM. Refer to
EC-806, "Removal and Installation"
NO
>> INSPECTION END
EC-580
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
U1044 ENG COMM CIRCUIT
U1044 ENG COMM CIRCUIT
DTC Description
INFOID:0000000010986299
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness or connectors
(LIN communication circuit is open or shorted.)
• Generator
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted. always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition ON and wait at least 10 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010986300
1.
CHECK LIN COMMUNICATION CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and generator harness connector.
3.
Check the continuity between ECM harness connector and generator harness connector.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
REPLACE GENERATOR
1.
Replace generator. Refer to
CHG-46, "QR25DE : Removal and Installation"
.
2.
Erase DTC.
3.
Perform DTC confirmation procedure again. Refer to
.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
U1044
ENG COMM CIRCUIT
(Engine communication circuit)
A signal voltage of LIN communication between ECM and generator is excessively
low or excessively high.
+
−
Continuity
ECM
Generator
Connector
Terminal
Connector
Terminal
F68
85
F15
2
Existed
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