Nissan Qashqai J11. Manual — part 438

ECK-312

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

P1487 LOW PRESSURE EGR VOLUME CONTROL VALVE

P1487 LOW PRESSURE EGR VOLUME CONTROL VALVE

DTC Logic

INFOID:0000000010289943

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 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

ECK-312, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010508577

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

ECK-359, "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.

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.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1487

LOW PRESSURE EGR
VALVE POSITION OFFSET
(Low pressure EGR valve po-
sition offset)
• 1.DEF: OFFSET IMPLAU-

SIBLE

ECM detects the low pressure EGR vol-
ume control valve regulation error.

• 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

P1487 LOW PRESSURE EGR VOLUME CONTROL VALVE

ECK-313

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

D

E

F

G

H

I

J

K

L

M

A

ECK

N

P

O

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

ECK-312, "DTC Logic"

.

Is the DTC P1487 displayed again?

YES

>> GO TO 7.

NO

>> Check intermittent incident. Refer to

GI-41, "Intermittent Incident"

.

7.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE MOTOR

Refer to

ECK-313, "Component Inspection (Low Pressure EGR Volume Control Valve Motor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-41, "Intermittent Incident"

.

NO

>> Replace error-detected parts.

Component Inspection (Low Pressure EGR Volume Control Valve Motor)

INFOID:0000000010508578

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

F80

65

F34

1

Existed

66

2

79

3

F81

151

6

152

5

Low pressure EGR volume control valve

Condition

Resistance

+

-

Terminal

5

6

Temperature

°

C (

°

F)

20 (68)

1.69

Ω

ECK-314

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

P1488 LOW PRESSURE EGR VOLUME CONTROL VALVE

P1488 LOW PRESSURE EGR VOLUME CONTROL VALVE

DTC Logic

INFOID:0000000010289946

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 1 minute before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 3 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to

ECK-314, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010508580

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

ECK-359, "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.

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.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1488

LOW PRESSURE EGR
VALVE BLOCKED
(Low pressure EGR valve
blocked)
• 1.DEF: NO RESPONSE

FROM THE VALVE MOTOR

• 2.DEF: CLOSING OF AIR

INLET FLAP

Low pressure EGR volume control
valve does not operate.

• Harness or connectors

(Low pressure EGR volume control valve circuit
is open or shorted.)

• Low pressure EGR volume control valve
• Low pressure EGR volume control valve position

sensor

P1488 LOW PRESSURE EGR VOLUME CONTROL VALVE

ECK-315

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

D

E

F

G

H

I

J

K

L

M

A

ECK

N

P

O

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

ECK-314, "DTC Logic"

.

Is the DTC P1488 displayed again?

YES

>> GO TO 7.

NO

>> Check intermittent incident. Refer to

GI-41, "Intermittent Incident"

.

7.

CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE MOTOR

Refer to

ECK-315, "Component Inspection (Low Pressure EGR Volume Control Valve Motor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-41, "Intermittent Incident"

.

NO

>> Replace error-detected parts.

Component Inspection (Low Pressure EGR Volume Control Valve Motor)

INFOID:0000000010508581

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

F80

65

F34

1

Existed

66

2

79

3

F81

151

6

152

5

Low pressure EGR volume control valve

Condition

Resistance

+

-

Terminal

5

6

Temperature

°

C (

°

F)

20 (68)

1.69

Ω