Nissan Qashqai J11. Manual — part 503
EC9-168
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
U0298 DC/DC CONVERTER
U0298 DC/DC CONVERTER
DTC Logic
INFOID:0000000010309056
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 1 minute 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
EC9-39, "STOP/START SYSTEM : System Description (M/T models)"
EC9-47, "STOP/START SYSTEM : System Description (CVT models)"
(CVT models).
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
EC9-168, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309057
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
—
(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
U0298 DC/DC CONVERTER
EC9-169
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
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A
EC9
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, alternator harness connector, and active grille shutter
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
EC9-408, "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
EC9-405, "Removal and Installation"
NO
>> Repair or replace error-detected parts.
+
–
Condition
Voltage
(Approx.)
DC/DC converter
Connector
Terminal
M22
9
Ground
While cranking with restart
2.0 V or less
Except above
Battery voltage
+
–
Continuity
DC/DC converter
ECM
Connector
Terminal
Connector
Terminal
M22
9
F82
37
Existed
EC9-170
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
DTC Logic
INFOID:0000000010499282
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 1 minute or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
1.
Turn ignition switch ON and wait at least 10 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
EC9-170, "Diagnosis Procedure"
.
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
1.
Start the engine and let it idle for at least 5 minutes.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
EC9-170, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010499283
1.
CHECK ENGINE COMMUNICATION LINE
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect DC/DC converter harness connector, alternator harness connector, and active grille shutter
harness connector.
4.
Check the continuity between ECM harness connector and DC/DC converter harness connector.
5.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
Is the inspection result normal?
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0299
—
(Lost communication with DC to DC con-
verter control module “B”)
• ECM receives an abnormality signal
sent from DC/DC converter.
• ECM is not receiving LIN communica-
tion signal sent from DC/DC converter.
• DC/DC converter
• Harness and connectors
(LIN communication line)
+
−
Continuity
ECM
DC/DC converter
Connector
Terminal
Connector
Terminal
F82
68
M22
7
Existed
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
EC9-171
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
YES
>> Replace DC/DC converter. Refer to
EC9-408, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
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