Nissan Qashqai J11. Manual — part 207
ECH-126
< DTC/CIRCUIT DIAGNOSIS >
[HRA2DDT]
U0111 LIN COMMUNICATION
U0111 LIN COMMUNICATION
DTC Logic
INFOID:0000000010786461
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECH-126, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010786462
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.
CHECK ALTERNATOR
Check alternator. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace alternator. Refer to
CHG-28, "HRA2DDT : Removal and Installation"
.
3.
CHECK DTC
1.
Erase DTC.
2.
Perform DTC confirmation procedure again. Refer to
Is DTC detected again?
YES
>> Replace ECM.
NO
>> INSPECTION END
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
U0111
Lost communication with battery energy
control module “A”
ECM detects LIN communication error.
• Harness and connectors
(LIN communication circuit is
open or shorted.)
• Alternator
• ECM
+
−
Continuity
ECM
Alternator
Connector
Terminal
Connector
Terminal
F18
123
F54
2
Existed
U0121 CAN COMMUNICATION
ECH-127
< DTC/CIRCUIT DIAGNOSIS >
[HRA2DDT]
C
D
E
F
G
H
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K
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A
ECH
N
P
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U0121 CAN COMMUNICATION
DTC Logic
INFOID:0000000010500803
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>>
ECH-127, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010500804
1.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and electric unit (control unit). Refer to
.
Is DTC detected?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Perform trouble shooting relevant to DTC indicated.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0121
LOST COMM (ABS)
(Lost communication with
anti-lock brake system (ABS)
control module)
When ECM is not transmitting or receiving CAN
communication signal between ABS actuator and
electric unit (control unit).
ABS actuator and electric unit
(control unit)
ECH-128
< DTC/CIRCUIT DIAGNOSIS >
[HRA2DDT]
U0298 DC/DC CONVERTER
U0298 DC/DC CONVERTER
DTC Logic
INFOID:0000000010500805
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 12 minutes or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (Stop the engine.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECH-33, "STOP/START SYSTEM : System Description"
.
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECH-128, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010500806
1.
CHECK VOLTAGE STABILIZER SIGNAL
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (engine stop.)
5.
Touch “CANCEL” and restart the engine, and then check the voltage between DC/DC converter harness
connector and ground as per the following conditions.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0298
COMMUNICATION ERROR
(LOST)
(Lost communication with DC
to DC converter control module
“A”)
During the restart, the DC/DC converter
status of the engine communication line
does not show an decrease in voltage
after an ECM transmitted voltage stabi-
lizer signal is changed from battery volt-
age to 2.0 V or less.
• Harness and connectors
(Voltage stabilizer signal line is open or cir-
cuit shorted.)
• DC/DC converter
+
–
Condition
Voltage
(Approx.)
DC/DC converter
Connector
Terminal
M22
9
Ground
While cranking with restart
2.0 V or less
Except above
Battery voltage
U0298 DC/DC CONVERTER
ECH-129
< DTC/CIRCUIT DIAGNOSIS >
[HRA2DDT]
C
D
E
F
G
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A
ECH
N
P
O
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK VOLTAGE STABILIZER SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect DC/DC converter harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between DC/DC converter harness connector and ECM harness connector.
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
3.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECH-314, "Removal and Installation"
NO
>> Repair or replace error-detected parts.
4.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace ECM. Refer to
ECH-313, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
+
–
Continuity
DC/DC converter
ECM
Connector
Terminal
Connector
Terminal
M22
9
F17
56
Existed
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