Nissan Qashqai J11. Manual — part 541
EC9-320
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P1525 ASCD SYSTEM
P1525 ASCD SYSTEM
DTC Logic
INFOID:0000000010309308
DTC DETECTION LOGIC
NOTE:
DTC P1525 is displayed with another DTC.
Perform the trouble diagnosis for the corresponding DTC.
Diagnosis Procedure
INFOID:0000000010309309
DTC P1525 is displayed with another DTC.
Perform trouble diagnosis for the corresponding DTC. Refer to
.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1525
CONSISTENT MULTIPLEX
SIGNALS FOR CC/SL
(Consistent multiplex signals
for cruise control/speed limit-
er)
• 1.DEF: THE DATA SUP-
PLIED TO THE CRUISE
CONTROL OR SPEED
LIMITER ARE NOT COR-
RECT
Other DTC that illuminates MIL is detected
while ASCD is operating.
• Harness or connectors
• Others systems
• ECM
P1544 EGT SENSOR 2
EC9-321
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
P1544 EGT SENSOR 2
DTC Logic
INFOID:0000000010309310
DTC DETECTION LOGIC
NOTE:
If DTC P1544 is displayed with other DTC, perform trouble diagnosis for the other DTC. Refer to
DTC CONFIRMATION PROCEDURE
1.
PERFORM DIAGNOSIS PROCEDURE
NOTE:
DTC P1544 can not duplicate.
>> Proceed to
EC9-321, "Diagnosis Procedure"
.
Diagnosis Procedure
INFOID:0000000010309311
1.
CHECK EXHAUST LEAKAGE
Check exhaust leakage. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts. And then GO TO 11.
2.
CHECK HARNESS CONNECTOR CONNECTIONS
Check harness connector connection of the following items.
• ECM
• Exhaust gas temperature sensor 2
• TC boost sensor
• A/F sensor
• Exhaust electric throttle control actuator
• Injectors
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts. And then GO TO 11.
3.
CHECK EXHAUST GAS TEMPERATURE (EGT) SENSOR 2 POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect EGT sensor 2 harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between EGT sensor 2 harness connector and ground.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1544
TEMP SEN UPSTREAM OF
PF
(Temperature sensor upstream
of particle filter)
• 1.DEF: SIGNAL OUTSIDE
LOWER LIMIT
• 2.DEF: SIGNAL OUTSIDE
UPPER LIMIT
• 3.DEF: OPERATION TEM-
PERATURE TOO HIGH
• Diesel particulate filter temperature is more than
890
°
C (1,634
°
F).
• Diesel particulate filter temperature is extremely
low.
• Harness or connectors
(Exhaust gas temperature sen-
sor 2)
• Exhaust gas temperature sensor
2
• TC boost sensor
• A/F sensor
• Exhaust electric throttle control
actuator
• Injector(s)
• Exhaust leakage
• Catalytic converter and DPF
(Diesel Particulate Filter)
EC9-322
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P1544 EGT SENSOR 2
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK EXHAUST GAS TEMPERATURE (EGT) SENSOR 2 POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ECM harness connector and EGT sensor 2 harness connector.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Repair or replace error-detected parts. And then GO TO 11.
5.
CHECK EXHAUST GAS TEMPERATURE (EGT) SENSOR 2 SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ECM harness connector and EGT sensor 2 harness connector.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts. And then GO TO 11.
6.
CHECK EXHAUST GAS TEMPERATURE SENSOR 2
EC9-323, "Component Inspection (DPF Upstream Temperature Sensor)"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace error-detected parts. And then GO TO 11.
7.
CHECK TC BOOST SENSOR ROUTING CIRCUIT
EC9-197, "Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace error-detected parts. And then GO TO 11.
8.
CHECK AIR FUEL RATIO (A/F) SENSOR ROUTING CIRCUIT
EC9-368, "Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> GO TO 9.
+
−
Voltage
(Approx.)
EGT sensor 2
Connector
Terminal
F139
2
Ground
5 V
+
−
Continuity
ECM
EGT sensor 2
Connector
Terminal
Connector
Terminal
F83
105
F139
2
Existed
+
−
Continuity
ECM
EGT sensor 2
Connector
Terminal
Connector
Terminal
F83
109
F139
1
Existed
P1544 EGT SENSOR 2
EC9-323
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
NO
>> Replace error-detected parts. And then GO TO 11.
9.
CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR ROUTING CIRCUIT
EC9-286, "Diagnosis Procedure"
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Replace error-detected parts. And then GO TO 11.
10.
CHECK FUEL INJECTOR ROUTING CIRCUIT
EC9-214, "Diagnosis Procedure"
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace error-detected parts. And then GO TO 11.
11.
CHECK DIESEL PARTICULATE FILTER
EC9-359, "Component Inspection"
.
Is the inspection result normal?
YES-1 (Every inspection result are normal)>>Check intermittent incident. Refer to
.
YES-2 (After repairing any malfunctioning part)>>INSPECTION END
NO
>> Replace diesel particulate filter.
Component Inspection (DPF Upstream Temperature Sensor)
INFOID:0000000010309312
1.
CHECK EXHAUST GAS TEMPERATURE (EGT) SENSOR 2
1.
Disconnect EGT sensor 2 harness connector.
2.
Check resistance between EGT sensor 2 terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace EGT sensor 2.
EGT sensor 2
Condition
Resistance
+
-
Terminal
2
1
Temperature
°
C (
°
F)
20 (68)
89.309 – 159.795 k
Ω
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