Qashqai J11. Engine control system (HRA2DDT) - part 9

 

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Qashqai J11. Engine control system (HRA2DDT) - part 9

 

 

U0298 DC/DC CONVERTER

ECH-129

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

C

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F

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ECH

N

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O

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK VOLTAGE STABILIZER SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect DC/DC converter harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between DC/DC converter harness connector and ECM harness connector.

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.

3.

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.

4.

CHECK INTERMITTENT INCIDENT

Perform intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace ECM. Refer to 

ECH-313, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

+

Continuity

DC/DC converter

ECM

Connector

Terminal

Connector

Terminal

M22

9

F17

56

Existed

ECH-130

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

U0299 LOST COMMUNICATION (DC/DC CONVERTER)

U0299 LOST COMMUNICATION (DC/DC CONVERTER)

DTC Logic

INFOID:0000000010787426

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 12 minutes or more to start this procedure.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE-1

1.

Turn ignition switch ON and wait at least 10 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECH-130, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

1.

Start the engine and let it idle for at least 5 minutes.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECH-130, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010787427

1.

CHECK ENGINE COMMUNICATION LINE

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect DC/DC converter harness connector and alternator harness connector.

4.

Check the continuity between ECM harness connector and DC/DC converter harness connector.

5.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK DC/DC CONVERTER BATTERY POWER SUPPLY CIRCUIT

1.

Check the voltage between DC/DC converter harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U0299

Lost communication (LIN)

• ECM receives an abnormality signal 

sent from DC/DC converter.

• ECM is not receiving LIN communica-

tion signal sent from DC/DC converter.

• DC/DC converter
• Harness and connectors

(LIN communication line)

+

Continuity

ECM

DC/DC converter

Connector

Terminal

Connector

Terminal

F18

123

M22

7

Existed

U0299 LOST COMMUNICATION (DC/DC CONVERTER)

ECH-131

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

C

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2.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK DC/DC CONVERTER IGNITION POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

Check the voltage between DC/DC converter harness connector and ground.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK DC/DC CONVERTER GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between DC/DC converter harness connector and ground.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

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

DC/DC converter

Connector

Terminal

M23

1

Ground

Battery voltage

3

+

Voltage

DC/DC converter

Connector

Terminal

M22

10

Ground

Battery voltage

+

Continuity

DC/DC converter

Connector

Terminal

M23

2

Ground

Existed

ECH-132

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

U0315 CAN COMMUNICATION [ABS ACTUATOR AND ELECTRIC UNIT (CON-

TROL UNIT)]

U0315 CAN COMMUNICATION [ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT)]

DTC Logic

INFOID:0000000010500809

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DIAGNOSIS PROCEDURE

NOTE:
DTC U0315 can not duplicate.

>> Proceed to 

ECH-132, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010500810

1.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check DTC with ABS actuator and electric unit (control unit). Refer to 

BRC-42, "CONSULT Function"

.

Is DTC detected?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Perform trouble shooting relevant to DTC indicated.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

U0315

VEHICLE SPEED
(Software incompatibility with anti-lock 
brake system control module)

ECM receives invalid signal of vehicle 
speed sent from ABS actuator and elec-
tric unit (control unit).

ABS actuator and electric unit 
(control unit)

U0415 CAN COMMUNICATION

ECH-133

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

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U0415 CAN COMMUNICATION

DTC Logic

INFOID:0000000010500811

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DIAGNOSIS PROCEDURE

NOTE:
DTC U0415 can not duplicate.

>> Proceed to 

ECH-133, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010500812

1.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check DTC with ABS actuator and electric unit (control unit). Refer to 

BRC-42, "CONSULT Function"

.

Is DTC detected?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Perform trouble shooting relevant to DTC indicated.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

U0415

ABS CONTROL MODULE
(Invalid data received from 
anti-lock brake system control 
module)

ECM receives invalid data sent from ABS actuator 
and electric unit (control unit).

ABS actuator and electric unit 
(control unit)

ECH-134

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

B1900 DC/DC CONVERTER

B1900 DC/DC CONVERTER

DTC Logic

INFOID:0000000010500813

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 12 minutes 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 

ECH-134, "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 

ECH-33, "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 

ECH-134, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500814

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check that the following fuse is not fusing.

Is the fuse fusing?

YES

>> Replace the fuse after repairing the applicable circuit.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B1900

DC/DC CONVERTER
(DC/DC converter power sup-
ply input 1 circuit)

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

Fuse No.

Capacity

F/L-O

30 A

B1900 DC/DC CONVERTER

ECH-135

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

C

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ECH

N

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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 fuse.

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 

ECH-314, "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

Fuse No.

Connector

Terminal

M23

1

F/L-O

Existed

ECH-136

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

B1901 DC/DC CONVERTER

B1901 DC/DC CONVERTER

DTC Logic

INFOID:0000000010500815

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 12 minutes 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 

ECH-136, "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 

ECH-33, "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 

ECH-136, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500816

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check that the following fuse is not fusing.

Is the fuse fusing?

YES

>> Replace the fuse after repairing the applicable circuit.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B1901

DC/DC CONVERTER
(DC/DC converter power sup-
ply input 2 circuit)

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

Fuse No.

Capacity

F/L-N

30 A

B1901 DC/DC CONVERTER

ECH-137

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

C

D

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ECH

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 fuse.

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 

ECH-314, "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

Fuse No.

Connector

Terminal

M23

3

F/L-N

Existed

ECH-138

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

B1902 DC/DC CONVERTER

B1902 DC/DC CONVERTER

DTC Logic

INFOID:0000000010500817

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 12 minutes 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 

ECH-33, "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 

ECH-138, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500818

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 1 CIRCUIT

1.

Disconnect the ignition relay.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B1902

DC/DC CONVERTER
(DC/DC converter power sup-
ply output 1 circuit)

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

Fuse No.

Capacity

#71

10 A

#72

10 A

#73

10 A

B1902 DC/DC CONVERTER

ECH-139

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

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2.

Disconnect DC/DC converter harness connector.

3.

Check the continuity between DC/DC converter harness connector ignition 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 IGNITION 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 

ECH-314, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

+

Continuity

DC/DC converter

Ignition relay

Connector

Terminal

M23

4

Switching circuit (+)

Existed

ECH-140

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

B1903 DC/DC CONVERTER

B1903 DC/DC CONVERTER

DTC Logic

INFOID:0000000010500819

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 12 minutes 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 

ECH-33, "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 

ECH-140, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500820

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 power sup-
ply output 2 circuit)

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

ECH-141

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

C

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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 accessory 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

ECH-142

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

B1904 DC/DC CONVERTER

B1904 DC/DC CONVERTER

DTC Logic

INFOID:0000000010500821

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 

ECH-134, "DTC Logic"

 or 

ECH-136, "DTC Logic"

.

1.

PRECONDITIONING

If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 12 minutes 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 

ECH-33, "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 

ECH-142, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500822

1.

INSPECTION START

1.

Turn ignition switch ON.

2.

Erase DTC.

3.

Perform DTC Confirmation Procedure. Refer to 

ECH-142, "DTC Logic"

.

4.

Check DTC.

Is the DTC B1904 displayed again?

YES

>> Replace DC/DC converter. Refer to 

ECH-314, "Removal and Installation"

.

NO

>> INSPECTION END

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B1904

DC/DC CONVERTER
(DC/DC converter abnormality)

DC/DC converter function is malfunctioning.

DC/DC converter

P0001 HIGH PRESSURE FUEL PUMP

ECH-143

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

C

D

E

F

G

H

I

J

K

L

M

A

ECH

N

P

O

P0001 HIGH PRESSURE FUEL PUMP

DTC Logic

INFOID:0000000010500328

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 12 minutes before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 4 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECH-143, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500329

1.

CHECK HIGH PRESSURE FUEL PUMP HI CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect high pressure fuel pump harness connector and ECM harness connector.

3.

Check the continuity between high pressure fuel pump harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK HIGH PRESSURE FUEL PUMP LO CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between high pressure fuel pump harness connector and ECM harness connector.

2.

Also check harness for short to ground and short to power. 

Is the inspection result normal?

YES

>> GO TO 3.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0001

FUEL VOLUME REGULATOR
(Fuel volume regulator)

• ECM detects a short circuit to ground.
• ECM detects a short circuit to battery.
• ECM detects a open circuit.

• Harness or connectors

(High pressure supply pump 
circuit is open or shorted.)

• High pressure supply pump

+

-

Continuity

high pressure fuel pump

ECM

Connector

Terminal

Connector

Terminal

F23

1

F17

95

Existed

+

-

Continuity

high pressure fuel pump

ECM

Connector

Terminal

Connector

Terminal

F23

2

F17

96

Existed

ECH-144

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

P0001 HIGH PRESSURE FUEL PUMP

NO

>> Repair or replace error-detected parts.

3.

CHECK HIGH PRESSURE FUEL PUMP

Check high pressure fuel pump. Refer to 

ECH-144, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace high pressure fuel pump.

4.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace error-detected parts.

Component Inspection

INFOID:0000000010828052

1.

CHECK HIGH PRESSURE FUEL PUMP

1.

Turn ignition switch OFF.

2.

Disconnect high pressure fuel pump harness connector.

3.

Check the resistance between high pressure fuel pump terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace high pressure fuel pump.

High pressure fuel pump

Condition

Resistance

+

Terminal

1

2

Temperature

30

°

C (

22

°

F)

0.39 

20

°

C (68

°

F)

0.48 

120

°

C (248

°

F)

0.67 

 

 

 

 

 

 

 

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