Nissan X-Trail 32. Manual - part 996

P1486 LOW PRESSURE EGR VOLUME CONTROL VALVE POSITION SENSOR

EC-1113

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

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EC

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P1486 LOW PRESSURE EGR VOLUME CONTROL VALVE POSITION
SENSOR

DTC Description

INFOID:0000000010935805

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (Low pressure EGR volume control valve position sensor circuit is open or shorted.)
• Low pressure EGR volume control valve position sensor

FAIL-SAFE

• EGR valve is closed position
• Throttle control motor is opened
• CSF regenerations forbidden
• CSF regeneration forbidden
• CCSL deactivation with dashboard message
• Freeshift inhibited

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-1113, "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:0000000010935806

1.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE

Visually check low 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 DIESEL PARTICULATE FILTER

Refer to 

EC-1173, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace diesel particulate filter.

3.

CHECK ECM HARNESS CONNECTOR CONNECTIONS

Check ECM harness connector connection.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1486

LOW PRESSURE EGR VALVE POSITION 
SENSOR
(Low pressure EGR valve position sensor)
• 1.DEF: SIGNAL INCOHERENCE

• An excessively high voltage (more than 4.7 V) from low pressure EGR 

volume control valve position sensor is sent to ECM.

• An excessively low voltage (less than 0.3 V) from low pressure EGR vol-

ume control valve position sensor is sent to ECM.

EC-1114

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P1486 LOW PRESSURE EGR VOLUME CONTROL VALVE POSITION SENSOR

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE HARNESS CONNECTOR CONNECTIONS

Check low pressure EGR volume control valve harness connector connection.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check low pressure EGR volume control valve circuit for open and short.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

DTC CONFIRMATION PROCEDURE

1.

Erase DTC.

2.

Perform DTC confirmation procedure again. Refer to 

EC-1107, "DTC Description"

.

Is the DTC P1486 displayed again?

YES

>> GO TO 7.

NO

>> INSPECTION END

7.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE MOTOR

Refer to 

EC-1120, "Component Inspection (Low Pressure EGR Volume Control Valve Motor)"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace error-detected parts. 

Component Inspection (Low Pressure EGR Volume Control Valve Motor)

INFOID:0000000010935807

1.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect low pressure EGR volume control valve harness connector.

3.

Check resistance between low pressure EGR volume control valve terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

+

-

Continuity

ECM

Low pressure EGR volume 

control valve

Connector

Terminal

Connector

Terminal

F117

55

F155

1

Existed

65

2

69

3

F118

136

6

143

5

Low pressure EGR volume control valve

Condition

Resistance

+

-

Terminal

5

6

Temperature

°

 C (

°

F)

20 (68)

1.41 

Ω

P1486 LOW PRESSURE EGR VOLUME CONTROL VALVE POSITION SENSOR

EC-1115

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

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F

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EC

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NO

>> Replace low pressure EGR volume control valve.

EC-1116

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P1487 LOW PRESSURE EGR VOLUME CONTROL VALVE

P1487 LOW PRESSURE EGR VOLUME CONTROL VALVE

DTC Description

INFOID:0000000010935808

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (Low pressure EGR volume control valve circuit is open or shorted.)
• Low pressure EGR volume control valve stuck
• Low pressure EGR volume control valve
• Low pressure EGR volume control valve position sensor

FAIL-SAFE

• EGR valve is closed position
• Throttle control motor is opened
• CSF regenerations forbidden
• CSF regeneration forbidden
• CCSL deactivation with dashboard message
• Freeshift inhibited

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-1116, "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:0000000010935809

1.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE

Visually check low 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 DIESEL PARTICULATE FILTER

Refer to 

EC-1173, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace diesel particulate filter.

3.

CHECK ECM HARNESS CONNECTOR CONNECTIONS

Check ECM harness connector connection.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1487

LOW PRESSURE EGR VALVE
(Low pressure EGR valve)
• 1.DEF: OFFSET IMPLAUSIBLE

ECM detects the low pressure EGR volume control valve regulation error.