Nissan X-Trail 32. Manual - part 1001

P1525 ASCD SYSTEM

EC-1133

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1525 ASCD SYSTEM

DTC Description

INFOID:0000000010935832

DTC DETECTION LOGIC

NOTE:
DTC P1525 is displayed with another DTC.
Perform the trouble diagnosis for the corresponding DTC.

POSSIBLE CAUSE

• Harness or connectors
• Others systems
• ECM

FAIL-SAFE

Not applicable

Diagnosis Procedure

INFOID:0000000010935833

DTC P1525 is displayed with another DTC.
Perform trouble diagnosis for the corresponding DTC. Refer to 

EC-908, "DTC Index"

.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1525

CONSISTENT MULTIPLEX SIGNALS FOR 
CC/SL
(Consistent multiplex signals for cruise con-
trol/speed limiter)
• 1.DEF: THE DATA SUPPLIED TO THE 

CRUISE CONTROL OR SPEED LIMIT-
ER ARE NOT CORRECT

Other DTC that illuminates MIL is detected while ASCD is operating.

EC-1134

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P1544 EGT SENSOR 2

P1544 EGT SENSOR 2

DTC Description

INFOID:0000000010935834

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (Exhaust gas temperature sensor 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)

FAIL-SAFE

• EGR valve is closed position
• Throttle control motor is opened
• Prohibit DPF regeneration

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC PRIORITY

If DTC P1544 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

PERFORM DIAGNOSIS PROCEDURE

NOTE:
DTC P1544 can not duplicate.

>> Proceed to 

EC-1134, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010935835

1.

CHECK DTC PRIORITY

If DTC P1544 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK EXHAUST LEAKAGE

Check exhaust leakage. Refer to 

EX-16, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts. And then GO TO 11.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1544

TEMP SEN UPSTREAM OF PF
(Temperature sensor upstream of particle 
filter)
• 1.DEF: SIGNAL OUTSIDE LOWER LIM-

IT

• 2.DEF: SIGNAL OUTSIDE UPPER LIMIT
• 3.DEF: OPERATION TEMPERATURE 

TOO HIGH

• Diesel particulate filter temperature is more than 890 

°

C (1,634 

°

F).

• Diesel particulate filter temperature is extremely low.

P1544 EGT SENSOR 2

EC-1135

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3.

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 4.

NO

>> Repair or replace error-detected parts. And then GO TO 11.

4.

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.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

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

>> INSPECTION END

NO

>> Repair or replace error-detected parts. And then GO TO 11.

6.

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 7.

NO

>> Repair or replace error-detected parts. And then GO TO 11.

+

−

Voltage

(Approx.)

EGT sensor 2

Connector

Terminal

F143

2

Ground

5 V

+

−

Continuity

ECM

EGT sensor 2

Connector

Terminal

Connector

Terminal

F118

105

F143

2

Existed

+

−

Continuity

ECM

EGT sensor 2

Connector

Terminal

Connector

Terminal

F118

109

F143

1

Existed

EC-1136

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P1544 EGT SENSOR 2

7.

CHECK EXHAUST GAS TEMPERATURE SENSOR 2

Refer to 

EC-1136, "Component Inspection (DPF Upstream Temperature Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

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

8.

CHECK TC BOOST SENSOR ROUTING CIRCUIT

Refer to 

EC-1001, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

9.

CHECK AIR FUEL RATIO (A/F) SENSOR ROUTING CIRCUIT

Refer to 

EC-1184, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

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

10.

CHECK EXHAUST ELECTRIC THROTTLE CONTROL ACTUATOR ROUTING CIRCUIT

Refer to 

EC-1096, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

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

11.

CHECK FUEL INJECTOR ROUTING CIRCUIT

Refer to 

EC-1019, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace error-detected parts. And then GO TO 12.

12.

CHECK DIESEL PARTICULATE FILTER

Refer to 

EC-1173, "Component Inspection"

.

Is the inspection result normal?

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

GI-44, "Intermittent Inci-

dent"

.

YES-2 (After repairing any malfunctioning part)>>INSPECTION END
NO

>> Replace diesel particulate filter.

Component Inspection (DPF Upstream Temperature Sensor)

INFOID:0000000010935836

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