Nissan Qashqai J11. Manual — part 403
ECK-172
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1902 DC/DC CONVERTER
B1902 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289734
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
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-172, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289735
1.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 1
1.
Turn ignition switch ON.
2.
Check the voltage between fuse and ground.
PG-56, "Wiring Diagram - IGNITION POWER SUPPLY -"
Is the inspection result normal?
YES
>> GO TO 2.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1902
DC/DC CONVERTER
(DC/DC converter)
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
+
–
Voltage
Fuse No.
71
Ground
Battery voltage
72
73
74
B1902 DC/DC CONVERTER
ECK-173
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
C
D
E
F
G
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A
ECK
N
P
O
NO
>> GO TO 3.
2.
CHECK IGNITION POWER SUPPLY CIRCUIT
Check the following units power supply circuit.
• Combination meter
• Steering angle sensor
• Ignition power supply fuse No. 73 circuit
• Ignition power supply fuse No. 74 circuit
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
3.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 1 CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect battery negative terminal.
3.
Disconnect DC/DC converter harness connector.
4.
Check the continuity between DC/DC converter and Ignition relay.
PG-56, "Wiring Diagram - IGNITION POWER SUPPLY -"
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.
4.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
+
–
Continuity
DC/DC converter
Connector
Terminal
M23
4
Ignition relay
Existed
ECK-174
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1903 DC/DC CONVERTER
B1903 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289736
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
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-174, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289737
1.
CHECK FUSE-1
Check that the following fuse is not fusing.
PG-11, "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 (BATTERY)
1.
Turn ignition switch OFF.
2.
Check the voltage between fuse and ground.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1903
DC/DC CONVERTER
(DC/DC converter)
DC/DC converter detects power supply
output 2 is 5.0 V or less when restart
the engine.
• 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
Fuse No.
Capacity
#80
20 A
B1903 DC/DC CONVERTER
ECK-175
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
C
D
E
F
G
H
I
J
K
L
M
A
ECK
N
P
O
PG-11, "Wiring Diagram - BATTERY POWER SUPPLY -"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Perform trouble diagnosis for battery power supply circuit.
3.
CHECK FUSE-2
Check that the following fuse is not fusing.
PG-11, "Wiring Diagram - BATTERY POWER SUPPLY -"
.
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 4.
4.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 2 (ACCESSORY)
1.
Turn ignition switch ON.
2.
Check the voltage between fuse and ground.
PG-49, "Wiring Diagram - ACCESSORY POWER SUPPLY -"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Perform trouble diagnosis for accessory power supply circuit.
5.
CHECK ACCESSORY RELAY ROUTING CIRCUIT
Check ignition relay routing circuit.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECH-314, "Removal and Installation"
NO
>> Repair or replace error-detected parts.
+
−
Voltage
Fuse No.
#80
Ground
Battery voltage
Fuse No.
Capacity
#76
10 A
#77
10 A
+
–
Voltage
Fuse No.
76
Ground
Battery voltage
77
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