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
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
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 >
[R9M]
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EC9
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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
.
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
.
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)"
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.
>> 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 >
[R9M]
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EC9
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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
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