Nissan X-Trail 32. Manual — part 962
B1901 DC/DC CONVERTER
EC-977
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
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B1901 DC/DC CONVERTER
DTC Description
INFOID:0000000010935638
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness and connectors (DC/DC converter power supply input 2 circuit is open or shorted.)
• DC/DC converter
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 10 seconds or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
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.
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)"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
B1901
—
(—)
DC/DC converter detects power supply input 2 is 5.0 V or less and differ-
ence between power supply input 2 and power supply input 1 is 4.0 V or
more for 3 seconds.
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
Restart the engine
Prohibit the stop/start system operation
from the next time
EC-978
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1901 DC/DC CONVERTER
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:0000000010935639
1.
CHECK FUSE
1.
Turn ignition switch OFF.
2.
Check that the following fuse is not fusing.
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 2.
2.
CHECK DC/DC CONVERTER POWER SUPPLY INPUT 2
1.
Disconnect DC/DC converter harness connector.
2.
Check the voltage between DC/DC converter harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK DC/DC CONVERTER POWER SUPPLY INPUT 2 CIRCUIT
1.
Disconnect battery negative terminal.
2.
Check the continuity between DC/DC converter harness connector and fuse.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
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 DC/DC converter. Refer to
EC-1229, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
Fuse No.
Capacity
F/L-N
30 A
+
−
Voltage
DC/DC converter
Connector
Terminal
M97
3
Ground
Battery voltage
+
−
Continuity
DC/DC converter
Fuse No.
Connector
Terminal
M97
3
F/L-N
Existed
B1902 DC/DC CONVERTER
EC-979
< DTC/CIRCUIT DIAGNOSIS >
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EC
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B1902 DC/DC CONVERTER
DTC Description
INFOID:0000000010935640
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness and connectors (DC/DC converter power supply output 1 circuit is open or shorted.)
• DC/DC converter
• Components power-supplied from DC/DC output 1
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 10 seconds 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:0000000010935641
1.
CHECK FUSE
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
B1902
—
(—)
DC/DC converter detects power supply output 1 is 5.0 V or less when re-
start the engine.
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
Restart the engine
Prohibit the stop/start system operation
from the next time
EC-980
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1902 DC/DC CONVERTER
Check that the following fuse is not fusing.
Refer to
PG-12, "Wiring Diagram - BATTERY POWER SUPPLY -"
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 2.
2.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 1 CIRCUIT
1.
Disconnect the ignition relay.
2.
Disconnect DC/DC converter harness connector.
3.
Check the continuity between DC/DC converter harness connector ignition relay harness connector.
Refer to
PG-12, "Wiring Diagram - BATTERY POWER SUPPLY -"
4.
Also check harness for short to ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK IGNITION RELAY ROUTING CIRCUIT
Check ignition relay routing circuit.
Is the inspection result normal?
YES
>> GO TO 4.
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 DC/DC converter. Refer to
EC-1229, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
Fuse No.
Capacity
#54
10 A
#55
10 A
#56
10 A
#57
10 A
+
−
Continuity
DC/DC converter
Ignition relay
Connector
Terminal
M97
4
Switching circuit (+)
Existed
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