Nissan Qashqai J11. Manual - part 539

EC9-312

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P148B LOW PRESSURE EGR VOLUME CONTROL VALVE

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 

EC9-311, "DTC Logic"

.

Is the DTC P148B 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 

EC9-312, "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:0000000010499300

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

F83

136

F77

6

Existed

143

5

Low pressure EGR volume control valve

Condition

Resistance

+

-

Terminal

5

6

Temperature

°

 C (

°

F)

20 (68)

1.69 

Ω

P148C EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR

EC9-313

< DTC/CIRCUIT DIAGNOSIS >

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P148C EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR

DTC Logic

INFOID:0000000010499301

DTC DETECTION LOGIC

NOTE:
If DTC P1480 is displayed with DTC P1481 and P1482, perform trouble diagnosis for DTC P1481 and
P1482. Refer to 

ECK-97, "DTC Index"

.

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 

EC9-313, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010499302

1.

CHECK ECM HARNESS CONNECTOR CONNECTIONS

1.

Turn ignition switch OFF.

2.

Check ECM harness connector connection.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR HARNESS CONNECTOR CONNEC-

TIONS

Check exhaust electric throttle control actuator harness connector connection.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR POWER SUPPLY CIRCUIT

Check the power supply of the exhaust electric throttle control actuator.

Is the inspection result normal?

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P148C

EXHAUST AIR FLAP FUNCTION
(Exhaust air flap function)
• 1.DEF: NO RESPONSE FROM 

THE VALVE MOTOR

• Exhaust throttle valve regulation error.
• ECM detects an incorrect position of the ex-

haust throttle valve.

• Exhaust throttle valve stuck
• Exhaust electric throttle control 

actuator

+

-

Voltage

Exhaust electric throttle control ac-

tuator

Connector

Terminal

F59

5

Ground

Battery voltage

EC9-314

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P148C EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR

YES

>> GO TO 4.

NO

>> Perform trouble diagnosis for power supply circuit.

4.

CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check exhaust electric throttle control actuator circuit for open and short.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

DTC CONFIRMATION PROCEDURES

1.

Erase DTC.

2.

Perform DTC confirmation procedure again. Refer to 

EC9-313, "DTC Logic"

.

Is the DTC P148C displayed again?

YES

>> GO TO 6.

NO

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

6.

CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR

Perform 

ECK-303, "Component Inspection (Exhaust Throttle Position Sensor)"

, 

EC9-314, "Component

Inspection (Exhaust Throttle Control Motor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> GO TO 7.

7.

REPLACE EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace exhaust electric throttle control actuator.

2.

Perform 

ECK-137, "Work Procedure"

.

>> INSPECTION END

Component Inspection (Exhaust Throttle Control Motor)

INFOID:0000000010499303

1.

CHECK EXHAUST THROTTLE CONTROL MOTOR

1.

Disconnect exhaust electric throttle control actuator harness connector.

2.

Check the resistance between exhaust throttle control motor terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace exhaust electric throttle control actuator.

+

+

Continuity

ECM

Exhaust electric throttle 

control actuator

Connector

Terminal

Connector

Terminal

F83

104

F59

1

Existed

113

3

117

2

132

5

147

6

Exhaust electric throttle control actua-

tor

Resistance

+

-

Terminal

5

6

2.65 - 3.25 

Ω

P148C EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR

EC9-315

< DTC/CIRCUIT DIAGNOSIS >

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Component Inspection (Exhaust Throttle Position Sensor)

INFOID:0000000010503584

1.

CHECK EXHAUST THROTTLE POSITION SENSOR

1.

Turn ignition switch ON.

2.

Check the voltage between ECM terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace exhaust electric throttle control actuator.

ECM

Voltage

+

-

Terminal

113

117

0.2 – 4.8 V