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
B1901 DC/DC CONVERTER
EC9-177
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
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EC9
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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-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.
+
−
Voltage
DC/DC converter
Connector
Terminal
M23
3
Ground
Battery voltage
+
−
Continuity
DC/DC converter
Fuse No.
Connector
Terminal
M23
3
F/L-N
Existed
EC9-178
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1902 DC/DC CONVERTER
B1902 DC/DC CONVERTER
DTC Logic
INFOID:0000000010309077
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
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
EC9-178, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309078
1.
CHECK FUSE
Check that the following fuse is not fusing.
Refer to
PG-11, "Wiring Diagram - BATTERY POWER SUPPLY -"
.
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 2.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1902
—
(—)
DC/DC converter detects power supply
output 1 is 5.0 V or less when restart
the engine.
• 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
Fuse No.
Capacity
#71
10 A
#72
10 A
#73
10 A
#74 (only in models with CVT)
10 A
B1902 DC/DC CONVERTER
EC9-179
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
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EC9
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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-11, "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-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.
+
−
Continuity
DC/DC converter
Ignition relay
Connector
Terminal
M23
4
Switching circuit (+)
Existed
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