Nissan X-Trail 32. Manual - part 963

 

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Nissan X-Trail 32. Manual - part 963

 

 

B1903 DC/DC CONVERTER

EC-981

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

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B1903 DC/DC CONVERTER

DTC Description

INFOID:0000000010935642

DTC DETECTION LOGIC

POSSIBLE CAUSE

• 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

FAIL-SAFE

STOP/START SYSTEM

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 

EC-848, "STOP/START SYSTEM : System Description (M/T models)"

(M/T models), 

EC-856, "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 

EC-981, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010935643

1.

CHECK FUSE

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

B1903


(—)

DC/DC converter detects power supply output 2 is 5.0 V or less when re-
start the engine.

Stop/start system operating condition in fail safe mode

Idling or driving the vehicle

Stop/start system operating

Stop

During cranking

(Restart)

Prohibit the stop/start system operation

Restart the engine

Prohibit the stop/start system operation 
from the next time

EC-982

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

B1903 DC/DC CONVERTER

Check that the following fuse is not fusing.

Refer to 

PG-12, "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.

2.

Disconnect DC/DC converter harness connector.

3.

Check the continuity between DC/DC converter harness connector accessory relay harness connector.

Refer to 

PG-12, "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-44, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace DC/DC converter. Refer to 

EC-1229, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Fuse No.

Capacity

#59

10 A

#60

10 A

+

Continuity

DC/DC converter

Accessory relay

Connector

Terminal

M97

6

Switching circuit (+)

Existed

B1904 DC/DC CONVERTER

EC-983

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

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B1904 DC/DC CONVERTER

DTC Description

INFOID:0000000010935644

DTC DETECTION LOGIC

POSSIBLE CAUSE

DC/DC converter

FAIL-SAFE

STOP/START SYSTEM

1.

CHECK DTC PRIORITY

If DTC B1904 is displayed with DTC B1900 or B1901, first perform the trouble diagnosis for DTC B1900 or
B1901.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

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 3.

3.

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 

EC-848, "STOP/START SYSTEM : System Description (M/T models)"

(M/T models), 

EC-856, "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 

EC-984, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

B1904


(—)

DC/DC converter function is malfunctioning.

Stop/start system operating condition in fail safe mode

Idling or driving the vehicle

Stop/start system operating

Stop

During cranking

(Restart)

Prohibit the stop/start system operation 
from the next time

EC-984

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

B1904 DC/DC CONVERTER

Diagnosis Procedure

INFOID:0000000010935645

1.

CHECK DTC PRIORITY

If DTC B1904 is displayed with DTC B1900 or B1901, first perform the trouble diagnosis for DTC B1900 or
B1901.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

INSPECTION START

1.

Turn ignition switch ON.

2.

Erase DTC.

3.

Perform DTC Confirmation Procedure. Refer to 

EC-983, "DTC Description"

.

4.

Check DTC.

Is the DTC B1904 displayed again?

YES

>> Replace DC/DC converter. Refer to 

EC-1229, "Removal and Installation"

.

NO

>> INSPECTION END

 

 

 

 

 

 

 

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