Nissan X-Trail 32. Instruction — part 999
P148A HIGH PRESSURE EGR VOLUME CONTROL VALVE
EC-1125
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
Is the DTC P148A displayed again?
YES
>> GO TO 6.
NO
>> INSPECTION END
6.
CHECK HIGH PRESSURE EGR VOLUME CONTROL VALVE MOTOR
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]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
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
Is the DTC P148B displayed again?
YES
>> GO TO 7.
NO
>> INSPECTION END
7.
CHECK LOW PRESSURE EGR VOLUME CONTROL VALVE MOTOR
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
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