Nissan X-Trail 32. Manual - part 999

P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE

EC-1125

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

C

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EC

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P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE

DTC Description

INFOID:0000000010935817

DTC DETECTION LOGIC

POSSIBLE CAUSE

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

FAIL-SAFE

Not applicable

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.

Start engine and warm it up to normal operation temperature.

2.

Turn ignition switch OFF and wait at least 60 seconds.

3.

Turn ignition switch ON.

4.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-1125, "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:0000000010935818

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 EGR VOLUME CONTROL VALVE HARNESS CONNECTOR CONNECTIONS

Check low pressure EGR valve and high pressure EGR valve harness connector connection.

Is the inspection result normal?

YES

>> GO TO 4.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P148A

HIGH PRESSURE EGR VALVE FUNC-
TION
(High pressure EGR valve function)
• 1.DEF: NO RESPONSE FROM THE 

VALVE MOTOR

ECM detects an incorrect position of high Pressure EGR volume control 
valve.

EC-1126

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE

NO

>> Repair or replace error-detected parts.

4.

CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE CIRCUIT

1.

Turn ignition switch OFF.

2.

Check EGR valve circuit for open and short.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

DTC CONFIRMATION PROCEDURE

1.

Erase DTC.

2.

Perform DTC confirmation procedure again. Refer to 

EC-1125, "DTC Description"

.

Is the DTC P148A displayed again?

YES

>> GO TO 6.

NO

>> INSPECTION END

6.

CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE MOTOR

Refer to 

EC-1126, "Component Inspection (High Pressure EGR Volume Control Valve Motor)"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace high pressure EGR volume control valve.

Component Inspection (High Pressure EGR Volume Control Valve Motor)

INFOID:0000000010935819

1.

CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE

1.

Turn ignition switch OFF.

2.

Disconnect high pressure EGR volume control valve harness connector.

3.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace high pressure EGR volume control valve.

+

-

Continuity

ECM

High pressure EGR volume 

control valve

Connector

Terminal

Connector

Terminal

F118

144

F156

1

Existed

148

2

High pressure EGR volume 

control valve

Condition

Resistance (Approx.)

+

-

Terminal

1

2

Temperature 

°

C (

°

F)

23 (73)

2.4 

Ω

P148B LOW PRESSURE EGR VOLUME CONTROL VALVE

EC-1127

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

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P148B LOW PRESSURE EGR VOLUME CONTROL VALVE

DTC Description

INFOID:0000000010935820

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Low pressure EGR volume control valve clogged
• Low pressure EGR volume control valve stuck
• Low pressure EGR volume control valve

FAIL-SAFE

Not applicable

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.

Start engine and warm it up to normal operation temperature.

2.

Turn ignition switch OFF and wait at least 60 seconds.

3.

Turn ignition switch ON.

4.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-1127, "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:0000000010935821

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.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P148B

LOW PRESSURE EGR VALVE FUNCTION
(Low pressure EGR valve function)
• 1.DEF: NO RESPONSE FROM THE 

VALVE MOTOR

ECM detects an incorrect position of the low pressure EGR volume control 
valve.

EC-1128

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P148B LOW PRESSURE EGR VOLUME CONTROL VALVE

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-1127, "DTC Description"

.

Is the DTC P148B displayed again?

YES

>> GO TO 7.

NO

>> INSPECTION END

7.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE MOTOR

Refer to 

EC-1128, "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:0000000010935822

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

NO

>> Replace low pressure EGR volume control valve.

+

-

Continuity

ECM

Low pressure EGR volume 

control valve

Connector

Terminal

Connector

Terminal

F118

136

F155

6

Existed

143

5

Low pressure EGR volume control valve

Condition

Resistance

+

-

Terminal

5

6

Temperature

°

 C (

°

F)

20 (68)

1.69 

Ω