Nissan Altima L32. Instruction — part 575

P1574 ASCD VEHICLE SPEED SENSOR

EC-1421

< COMPONENT DIAGNOSIS >

[VQ35DE]

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P1574 ASCD VEHICLE SPEED SENSOR

Description

INFOID:0000000004362282

The ECM receives two vehicle speed signals via the 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-1090, "System Diagram"

for ASCD functions.

DTC Logic

INFOID:0000000004362283

DTC DETECTION LOGIC

NOTE:

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

Refer to

EC-1179, "DTC Logic"

.

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

to

EC-1365, "DTC Logic"

.

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

to

EC-1376, "DTC Logic"

.

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

to

EC-1378, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine (ESP 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-1421, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004362284

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to

TM-117, "Diagnosis Description"

.

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

EC-1422

< COMPONENT DIAGNOSIS >

[VQ35DE]

P1574 ASCD VEHICLE SPEED SENSOR

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform trouble shooting relevant to DTC indicated.

2.

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

Refer to

BRC-223, "DTC No. Index"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK COMBINATION METER FUNCTION

Refer to

MWI-95, "DTC Index"

.

>> INSPECTION END

P1700 CVT CONTROL SYSTEM

EC-1423

< COMPONENT DIAGNOSIS >

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P1700 CVT CONTROL SYSTEM

Description

INFOID:0000000004362285

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

Refer to

EC-1555, "DTC Index"

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

EC-1424

< COMPONENT DIAGNOSIS >

[VQ35DE]

P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)

P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)

Description

INFOID:0000000004362286

ECM receives primary speed sensor signal from TCM via the CAN communication line. ECM uses this signal

for engine control.

DTC Logic

INFOID:0000000004362287

DTC DETECTION LOGIC

NOTE:

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

to

EC-1179, "DTC Logic"

.

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

to

EC-1292, "DTC Logic"

.

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

P0345. Refer to

EC-1296, "DTC Logic"

.

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

to

EC-1376, "DTC Logic"

.

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

to

EC-1378, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> 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-1424, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004362288

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to

TM-221, "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-254, "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 shorted.)

• Harness or connectors

(Primary speed sensor circuit is open or shorted.)

• TCM