Nissan Teana J32. Manual - part 435

EC-278

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

P1574 ASCD VEHICLE SPEED SENSOR

P1574 ASCD VEHICLE SPEED SENSOR

Description

INFOID:0000000003856758

The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination
meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con-
trol. Refer to 

EC-51, "System Diagram"

 for ASCD functions.

DTC Logic

INFOID:0000000003856759

DTC DETECTION LOGIC

NOTE:
• If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,

U1001. Refer to 

EC-135, "DTC Logic"

.

• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer

to 

EC-234, "DTC Logic"

.

• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-240, "DTC Logic"

.

• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-242, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine (VDC switch OFF).

2.

Drive the vehicle at more than 40 km/h (25 MPH).

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.

3.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-278, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003856760

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

TM-35, "Diagnosis Description"

.

Is the inspection result normal?

YES

>> GO TO 2.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P1574

ASCD vehicle speed 
sensor

The difference between the two vehicle speed 
signals is out of the specified range.

• Harness or connectors

(The CAN communication line is open or 
shorted.)

• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM

P1574 ASCD VEHICLE SPEED SENSOR

EC-279

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NO

>> Perform trouble shooting relevant to DTC indicated.

2.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Refer to 

BRC-80, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-33, "CONSULT-III Function (METER/M&A)"

.

>> INSPECTION END

EC-280

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

P1700 CVT CONTROL SYSTEM

P1700 CVT CONTROL SYSTEM

Description

INFOID:0000000003856761

This DTC is displayed with other DTC regarding TCM. Perform the trouble diagnosis for corresponding DTC.
Refer to 

EC-389, "DTC Index"

. When this DTC is detected, the ASCD control is canceled.

P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)

EC-281

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)

Description

INFOID:0000000003856762

ECM receives primary speed sensor signal from TCM through CAN communication line. ECM uses this signal
for engine control.

DTC Logic

INFOID:0000000003856763

DTC DETECTION LOGIC

NOTE:
• If DTC P1715 is displayed with DTC U1000, U1001 first perform the trouble diagnosis for DTC U1000,

U1001. Refer to 

EC-135, "DTC Logic"

.

• If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer

to 

EC-218, "DTC Logic"

.

• If DTC P1715 is displayed with DTC P0340, P0345, first perform the trouble diagnosis for DTC P0340,

P0345. Refer to 

EC-222, "DTC Logic"

.

• If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-240, "DTC Logic"

.

• If DTC P1715 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-242, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine.

2.

Drive vehicle at a speed of more than 50 km/h (31 MPH) for at least 5 seconds.

3.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-281, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003856764

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

TM-121, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform trouble shooting relevant to DTC indicated.

2.

REPLACE TCM

Replace TCM. Refer to 

TM-153, "Removal and Installation"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1715

Input speed sensor
(Primary speed sensor)
(TCM output)

Primary speed sensor signal is different 
from the theoretical value calculated by 
ECM from secondary sensor signal and 
engine rpm signal.

• Harness or connectors

(The CAN communication line is open or short-
ed)

• Harness or connectors

(Primary speed sensor circuit is open or short-
ed)

• TCM