Nissan X-Trail 32. Instruction — part 960
U0298 DC/DC CONVERTER
EC-969
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
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U0298 DC/DC CONVERTER
DTC Description
INFOID:0000000010935628
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness and connectors (Voltage stabilizer signal line is open or circuit shorted.)
• DC/DC converter
Harness or connectors (CAN communication line is open or shorted.)
FAIL-SAFE
STOP/START SYSTEM
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
EC-848, "STOP/START SYSTEM : System Description (M/T models)"
(M/T models),
EC-856, "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
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010935629
1.
CHECK VOLTAGE STABILIZER SIGNAL
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
U0298
—
(Lost communication with DC to DC con-
verter control module “A”)
During the restart, the DC/DC converter status of the engine communica-
tion line does not show an decrease in voltage after an ECM transmitted
voltage stabilizer signal is changed from battery voltage to 2.0 V or less.
Stop/start system operating condition in fail safe mode
Idling or driving the vehicle
Stop/start system operating
Stop
During cranking
(Restart)
—
—
Prohibit the stop/start system operation
from the next time
EC-970
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
U0298 DC/DC CONVERTER
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.
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.
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-44, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
EC-1229, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
4.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-44, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace ECM. Refer to
EC-1226, "Removal and Installation"
NO
>> Repair or replace error-detected parts.
+
–
Condition
Voltage
(Approx.)
DC/DC converter
Connector
Terminal
M98
9
Ground
While cranking with restart
2.0 V or less
Except above
Battery voltage
+
–
Continuity
DC/DC converter
ECM
Connector
Terminal
Connector
Terminal
M98
9
F117
37
Existed
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
EC-971
< DTC/CIRCUIT DIAGNOSIS >
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U0299 LOST COMMUNICATION (DC/DC CONVERTER)
DTC Description
INFOID:0000000010935630
DTC DETECTION LOGIC
POSSIBLE CAUSE
• DC/DC converter
• Harness and connectors (LIN communication line)
FAIL-SAFE
Not applicable
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
.
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
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010935631
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.
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.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
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 communication signal sent from DC/DC con-
verter.
+
−
Continuity
ECM
DC/DC converter
Connector
Terminal
Connector
Terminal
F117
68
M98
7
Existed
EC-972
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
NO
>> Repair or replace error-detected parts.
2.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-44, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
EC-1229, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
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