Nissan X-Trail 32. Instruction — part 963
B1903 DC/DC CONVERTER
EC-981
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
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B1903 DC/DC CONVERTER
DTC Description
INFOID:0000000010935642
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness and connectors (DC/DC converter power supply output 2 circuit is open or shorted.)
• DC/DC converter
• Components power-supplied from DC/DC output 2
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:0000000010935643
1.
CHECK FUSE
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
B1903
—
(—)
DC/DC converter detects power supply output 2 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-982
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1903 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 2 CIRCUIT
1.
Disconnect the accessory relay.
2.
Disconnect DC/DC converter harness connector.
3.
Check the continuity between DC/DC converter harness connector accessory 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 ACCESSORY 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
#59
10 A
#60
10 A
+
−
Continuity
DC/DC converter
Accessory relay
Connector
Terminal
M97
6
Switching circuit (+)
Existed
B1904 DC/DC CONVERTER
EC-983
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
B1904 DC/DC CONVERTER
DTC Description
INFOID:0000000010935644
DTC DETECTION LOGIC
POSSIBLE CAUSE
DC/DC converter
FAIL-SAFE
STOP/START SYSTEM
1.
CHECK DTC PRIORITY
If DTC B1904 is displayed with DTC B1900 or B1901, first perform the trouble diagnosis for DTC B1900 or
B1901.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
.
NO
>> GO TO 2.
2.
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 3.
3.
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
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
B1904
—
(—)
DC/DC converter function is malfunctioning.
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-984
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1904 DC/DC CONVERTER
Diagnosis Procedure
INFOID:0000000010935645
1.
CHECK DTC PRIORITY
If DTC B1904 is displayed with DTC B1900 or B1901, first perform the trouble diagnosis for DTC B1900 or
B1901.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
.
NO
>> GO TO 2.
2.
INSPECTION START
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Perform DTC Confirmation Procedure. Refer to
4.
Check DTC.
Is the DTC B1904 displayed again?
YES
>> Replace DC/DC converter. Refer to
EC-1229, "Removal and Installation"
.
NO
>> INSPECTION END
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