Nissan Qashqai J11. Manual — part 506
EC9-180
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1903 DC/DC CONVERTER
B1903 DC/DC CONVERTER
DTC Logic
INFOID:0000000010309079
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
EC9-180, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309080
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.
2.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 2 CIRCUIT
1.
Disconnect the accessory relay.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1903
—
(—)
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
#76
10 A
#77
10 A
B1903 DC/DC CONVERTER
EC9-181
< DTC/CIRCUIT DIAGNOSIS >
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2.
Disconnect DC/DC converter harness connector.
3.
Check the continuity between DC/DC converter harness connector accessory 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 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-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
Accessory relay
Connector
Terminal
M23
6
Switching circuit (+)
Existed
EC9-182
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
B1904 DC/DC CONVERTER
B1904 DC/DC CONVERTER
DTC Logic
INFOID:0000000010309081
DTC DETECTION LOGIC
NOTE:
If DTC B1904 is displayed with DTC B1900 or B1901, perform the trouble diagnosis for DTC B1900 or B1901.
Refer to
.
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
EC9-182, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309082
1.
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
EC9-408, "Removal and Installation"
.
NO
>> INSPECTION END
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1904
—
(—)
DC/DC converter function is malfunc-
tioning.
DC/DC converter
P0001 FUEL PUMP
EC9-183
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
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P0001 FUEL PUMP
DTC Logic
INFOID:0000000010309083
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
EC9-183, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309084
1.
CHECK FUEL FLOW ACTUATOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect fuel flow actuator harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between fuel flow actuator harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform the trouble diagnosis for power supply circuit.
2.
CHECK FUEL FLOW ACTUATOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between fuel flow actuator harness connector and ECM harness connector.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0001
FUEL FLOW REGULATOR CIR-
CUIT
(Fuel volume regulator control
circuit/open)
• 1.DEF: INLET FLAP
BLOCKED CLOSED
• 2.DEF: INLET FLAP
BLOCKED OPEN
• 3.DEF: OPERATION TEM-
PERATURE TOO HIGH
• ECM detects a short circuit to ground.
• ECM detects a short circuit to battery.
• ECM detects a open circuit.
• ECM detects an over temperature.
• Harness or connectors
(Fuel flow actuator circuit is
open or shorted.)
• Fuel flow actuator
+
-
Voltage
Fuel flow actuator
Connector
Terminal
F123
1
Ground
Battery voltage
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