Nissan Qashqai J11. Manual — part 402

ECK-168

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

B1900 DC/DC CONVERTER

B1900 DC/DC CONVERTER

DTC Logic

INFOID:0000000010289730

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

ECK-168, "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

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-168, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010289731

1.

CHECK FUSIBLE LINK

1.

Turn ignition switch OFF.

2.

Check that the following fusible link is not fusing.

Is the fusible link fusing?

YES

>> Replace the fusible link after repairing the applicable circuit.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B1900

DC/DC CONVERTER
(DC/DC converter)

DC/DC converter detects power supply
input 1 is 5.0 V or less and difference
between power supply input 1 and pow-
er supply input 2 is 4.0 V or more for 3
seconds.

• Harness and connectors

(DC/DC converter power supply input 1 cir-
cuit is open or shorted.)

• DC/DC converter

Location

Fusible link

Capacity

Fusible link holder

O

30 A

B1900 DC/DC CONVERTER

ECK-169

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

D

E

F

G

H

I

J

K

L

M

A

ECK

N

P

O

NO

>> GO TO 2.

2.

CHECK DC/DC CONVERTER POWER SUPPLY INPUT 1

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 1 CIRCUIT

1.

Disconnect battery negative terminal.

2.

Check the continuity between DC/DC converter harness connector and fusible link.

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

ECK-402, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

+

−

Voltage

DC/DC converter

Connector

Terminal

M23

1

Ground

Battery voltage

+

−

Continuity

DC/DC converter

Fusible link

Connector

Terminal

M23

1

O

Existed

ECK-170

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

B1901 DC/DC CONVERTER

B1901 DC/DC CONVERTER

DTC Logic

INFOID:0000000010289732

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

ECK-170, "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

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-170, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010289733

1.

CHECK FUSIBLE LINK

1.

Turn ignition switch OFF.

2.

Check that the following fusible link is not fusing.

Is the fusible link fusing?

YES

>> Replace the fusible link after repairing the applicable circuit.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B1901

DC/DC CONVERTER
(DC/DC converter)

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

Location

Fusible link

Capacity

Fusible link holder

N

30 A

B1901 DC/DC CONVERTER

ECK-171

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

D

E

F

G

H

I

J

K

L

M

A

ECK

N

P

O

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 fusible link.

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

ECK-402, "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

Fusible link

Connector

Terminal

M23

3

N

Existed