Nissan Qashqai J11. Manual — part 538
EC9-308
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P1489 LOW PRESSURE EGR VOLUME CONTROL VALVE UPSTREAM TEM-
PERATURE SENSOR
2.
Check low pressure EGR volume control valve circuit for open and short.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK DIESEL PARTICULATE FILTER
EC9-359, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace diesel particulate filter.
5.
CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE UPSTREAM TEMPERATURE SENSOR
EC9-308, "Component Inspection (Low Pressure EGR Temperature Sensor)"
.
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 Temperature Sensor)
INFOID:0000000010309304
1.
CHECK LOW PRESSURE EGR TEMPERATURE SENSOR
1.
Disconnect low pressure EGR volume control valve upstream temperature sensor harness connector.
2.
Check resistance between low pressure EGR temperature sensor terminals under the following condi-
tions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace low pressure EGR temperature sensor.
+
-
Continuity
ECM
Low pressure EGR volume
control valve
Connector
Terminal
Connector
Terminal
F82
55
F77
1
Existed
65
2
69
3
F83
136
6
143
5
Low pressure EGR temperature sen-
sor
Condition
Resistance
+
-
Terminal
2
1
Temperature
°
C (
°
F)
20 (68)
57.094 – 65.836 k
Ω
P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE
EC9-309
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE
DTC Logic
INFOID:0000000010499293
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.
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
EC9-309, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010499294
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.
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.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
148A
HIGH PRESSURE EGR VALVE
FUNCTION
(High pressure EGR valve func-
tion)
• 1.DEF: NO RESPONSE
FROM THE VALVE MOTOR
ECM detects an incorrect position of high Pres-
sure EGR volume control valve.
• Harness or connectors
• High pressure EGR volume control
valve
• High pressure EGR volume control
valve volume control valve position
sensor
EC9-310
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE
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
.
Is the DTC P148A displayed again?
YES
>> GO TO 6.
NO
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
6.
CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE MOTOR
ECK-239, "Component Inspection (EGR Volume Control Valve Motor)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Replace high pressure EGR volume control valve.
Component Inspection (High Pressure EGR Volume Control Valve Motor)
INFOID:0000000010499295
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
F83
144
F14
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
EC9-311
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
P148B LOW PRESSURE EGR VOLUME CONTROL VALVE
DTC Logic
INFOID:0000000010499298
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.
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
EC9-311, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010499299
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
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
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 pres-
sure EGR volume control valve.
• Low pressure EGR volume
control valve clogged
• Low pressure EGR volume
control valve stuck
• Low pressure EGR volume
control valve
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