Nissan Qashqai J11. Manual - part 293
U1001 CAN COMM CIRCUIT
ECM-149
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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U1001 CAN COMM CIRCUIT
DTC Description
INFOID:0000000010702877
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
ECM-149, "Diagnosis Procedure"
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-41, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010702878
Perform the trouble diagnosis for CAN communication system. Refer to
LAN-24, "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.