Nissan X-Trail 32. Instruction — part 980

P0471 EXHAUST PRESSURE SENSOR

EC-1049

< DTC/CIRCUIT DIAGNOSIS >

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P0471 EXHAUST PRESSURE SENSOR

DTC Description

INFOID:0000000010935728

DTC DETECTION LOGIC

POSSIBLE CAUSE

Exhaust gas pressure sensor

FAIL-SAFE

• Boost pressure limitation
• EGR valve is closed position
• Throttle control motor is opened
• CCSL deactivation (considered as abnormal with dashboard message)
• Freeshift inhibited
• CSF regeneration forbidden
• Torque limitation

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC PRIORITY

If DTC P0471 is displayed with DTC P0335, P0470 or P2226, first perform the trouble diagnosis for DTC
P0335, P0470 or P2226.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

PERFORM DIAGNOSIS PROCEDURE

NOTE:
DTC P0471 can not duplicate.

>> Proceed to

EC-1049, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010935729

1.

CHECK DTC PRIORITY

If DTC P0471 is displayed with DTC P0335, P0470 or P2226, first perform the trouble diagnosis for DTC
P0335, P0470 or P2226.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK ECM HARNESS CONNECTOR CONNECTIONS

1.

Turn ignition switch OFF.

2.

Check ECM harness connector connection.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK EXHAUST GAS PRESSURE SENSOR HARNESS CONNECTOR CONNECTIONS

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0471

PRS UPSTR OF TBN
(Exhaust pressure sensor “A” circuit range/
performance)
• 1.DEF: INCORRECT SENSOR MOUNT-

ING

• 2.DEF: SIGNAL INCOHERENCE

• Difference between barometric pressure and exhaust pressure while en-

gine stopped.

• Exhaust pressure is excessively low while engine is running.

EC-1050

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P0471 EXHAUST PRESSURE SENSOR

Check exhaust gas pressure sensor harness connector connection.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK EXHAUST GAS PRESSURE SENSOR POWER SUPPLY CIRCUIT

Check the power supply of the exhaust gas pressure sensor.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Perform trouble diagnosis for power supply circuit.

5.

CHECK EXHAUST GAS PRESSURE SENSOR CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check exhaust gas pressure sensor circuit for open and short.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK EXHAUST GAS PRESSURE SENSOR

Refer to

EC-1048, "Component Inspection (Exhaust Gas Pressure Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace error-detected parts.

7.

DTC CONFIRMATION PROCEDURES

1.

Erase DTC.

2.

Perform DTC confirmation procedure again. Refer to

EC-1046, "DTC Description"

.

Is the DTC P0471 displayed again?

YES

>> GO TO 8.

NO

>> Check intermittent incident. Refer to

GI-44, "Intermittent Incident"

.

8.

CHECK TURBOCHARGER

Check turbocharger.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-44, "Intermittent Incident"

.

NO

>> Repair or replace malfunctioning parts.

Component Inspection (Exhaust Gas Pressure Sensor)

INFOID:0000000010935730

1.

CHECK EXHAUST GAS PRESSURE SENSOR

1.

Disconnect exhaust gas pressure sensor harness connector.

+

-

Voltage

(Approx.)

Exhaust gas pressure sensor

Connector

Terminal

F81

3

Ground

5 V

+

-

Continuity

ECM

Exhaust gas pressure sen-

sor

Connector

Terminal

Connector

Terminal

F118

104

F81

3

Existed

126

1

138

2

P0471 EXHAUST PRESSURE SENSOR

EC-1051

< DTC/CIRCUIT DIAGNOSIS >

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2.

Check the resistance between exhaust gas pressure sensor terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace exhaust gas pressure sensor.

Exhaust gas pressure sensor

Resistance (Approx.)

+

-

Terminal

2

1

100 k

Ω

EC-1052

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P0487 EGR VOLUME CONTROL VALVE

P0487 EGR VOLUME CONTROL VALVE

DTC Description

INFOID:0000000010935731

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors
• High pressure EGR volume control valve
• High pressure EGR valve position sensor

FAIL-SAFE

• EGR valve is closed position
• Throttle control motor is opened
• Stop closed-loop control
• Freeshift inhibited
• CSF regeneration forbidden
• CCSL deactivation

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

EC-1052, "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:0000000010935732

1.

CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE

Visually check high pressure EGR volume control valve for chipping.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK ECM HARNESS CONNECTOR CONNECTIONS

Check ECM harness connector connection.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE HARNESS CONNECTOR CONNECTIONS

Check high pressure EGR volume control valve harness connector connection.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0487

EGR VLV CMD CIRC
(Exhaust gas recirculation throttle control
circuit “A”/open)
• 1.DEF: OFFSET IMPLAUSIBLE

ECM detects abnormally closed position of high pressure EGR volume
control valve.