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Nissan X-Trail 32. Manual - part 760
U1044 ENG COMM CIRCUIT
EC-169
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
U1044 ENG COMM CIRCUIT
DTC Description
INFOID:0000000010775100
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:0000000010775101
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
U1044
ENG COMM CIRCUIT
(Engine communication circuit)
A signal voltage of LIN communication between ECM and generator is ex-
cessively low or excessively high.
+
−
Continuity
ECM
Alternator
Connector
Terminal
Connector
Terminal
F7
45
F15
2
Existed