Nissan X-Trail 32. Manual — part 759
U0101 CAN COMM CIRCUIT
EC-165
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
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EC
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U0101 CAN COMM CIRCUIT
DTC Description
INFOID:0000000010775094
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 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-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010775095
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
U0101
LOST COMM (TCM)
(Lost communication with TCM)
When ECM is not transmitting or receiving CAN communication signal of
OBD (emission-related diagnosis) for 2 seconds or more.
EC-166
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
U1001 CAN COMM CIRCUIT
U1001 CAN COMM CIRCUIT
DTC Description
INFOID:0000000010775096
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 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-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
.
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010775097
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.
U1040 ENG COMM CIRCUIT
EC-167
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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U1040 ENG COMM CIRCUIT
DTC Description
INFOID:0000000010775098
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:0000000010775099
1.
CHECK LIN COMMUNICATION CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and alternator harness connector.
3.
Check the continuity between ECM harness connector and alternator 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 alternator. Refer to
CHG-44, "MR20DD : Removal and Installation"
.
2.
Erase DTC.
3.
Perform DTC confirmation procedure again. Refer to
.
DTC No.
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
Alternator
Connector
Terminal
Connector
Terminal
F7
45
F15
2
Existed
EC-168
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
U1040 ENG COMM CIRCUIT
Is DTC detected again?
YES
>> Replace ECM. Refer to
EC-430, "Removal and Installation"
NO
>> INSPECTION END
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