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 

EC9-108, "DTC Index"

.

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

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EC9

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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 

EC9-

108, "DTC Index"

.

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 

EX-21, "Inspection"

.

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

Refer to 

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

Refer to 

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

Refer to 

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

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EC9

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NO

>> Replace error-detected parts. And then GO TO 11.

9.

CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR ROUTING CIRCUIT

Refer to 

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

Refer to 

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

Refer to 

EC9-359, "Component Inspection"

.

Is the inspection result normal?

YES-1 (Every inspection result are normal)>>Check intermittent incident. Refer to 

GI-41, "Intermittent Inci-

dent"

.

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