Nissan Qashqai J11. Manual - part 403

 

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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.

Refer to 

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

H

I

J

K

L

M

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.

Refer to 

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.

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 (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

Refer to 

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.

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 4.

4.

CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 2 (ACCESSORY)

1.

Turn ignition switch ON.

2.

Check the voltage between fuse and ground.

Refer to 

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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