Nissan Qashqai J11. Manual - part 505
EC9-176
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1901 DC/DC CONVERTER
B1901 DC/DC CONVERTER
DTC Logic
INFOID:0000000010309075
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 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
EC9-176, "Diagnosis Procedure"
.
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
EC9-39, "STOP/START SYSTEM : System Description (M/T models)"
EC9-47, "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?
YES
>> Proceed to
EC9-176, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309076
1.
CHECK FUSE
1.
Turn ignition switch OFF.
2.
Check that the following fuse is not fusing.
Is the fuse fusing?
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1901
—
(—)
DC/DC converter detects power supply
input 2 is 5.0 V or less and difference
between power supply input 2 and
power supply input 1 is 4.0 V or more
for 3 seconds.
• Harness and connectors
(DC/DC converter power supply input 2 cir-
cuit is open or shorted.)
• DC/DC converter
Fuse No.
Capacity
F/L-N
30 A