Nissan Sentra manuals

Nissan Sentra Service Manual: P1574 ASCD Vehicle speed sensor

Description

The ECM receives two vehicle speed sensor 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 control. Refer to EC-51, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description" for ASCD functions.

DTC Logic

DTC DETECTION LOGIC

NOTE:

DTC No.

CONSULT screen terms (Trouble diagnosis content)

DTC detecting condition

Possible cause

P1574 ASCD VHL SPD SEN (ASCD VHL SPD SEN) ECM detects a difference between two vehicle speed signals is out of the specified range.
  • Harness or connectors (CAN communication line is open or shorted.)
  • ABS actuator and electric unit (control unit)
  • TCM
  • ECM

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting 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 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.

  1. Check DTC.

Is DTC detected? YES >> Proceed to EC-397, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK DTC WITH TCM

Check DTC with TCM. Refer to TM-108, "CONSULT Function".

Is DTC detected?

NO >> GO TO 2.

YES >> Perform trouble shooting relevant to DTC indicated.

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

Check DTC with ABS actuator and electric unit (control unit). Refer to BRC-31, "CONSULT Function (ABS)".

Is DTC detected? NO >> INSPECTION END

YES >> Perform trouble shooting relevant to DTC indicated.

P1572 ASCD Brake switch
DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-348, "DTC Logic". This self-diagnosi ...

P1650 Starter motor relay 2
Description ECM controls ON/OFF state of the starter relay, according to the engine and vehicle condition. ECM transmits a control signal to IPDM E/R via BCM by CAN communication. Under normal ...

Other materials:

Cowl top
Exploded view Cowl top seal Cowl top grille cap Cowl top cover Cowl top extension Cowl top extension insulator Clip EPT seal [t: 3.0 mm (0.12 in) Cowl top cover cap EPT seal [t: 5.0 mm (0.20 in)] Pawl Clip Front Removal and installation COWL TOP COVER Removal Rem ...

P0743 Torque converter
DTC Logic DTC DETECTION LOGIC DTC CONSULT screen terms (Trouble diagnosis content) DTC detection condition Possible causes P0743 TORQUE CONVERTER (Torque Converter Clutch Circuit Electrical) The TCM torque converter clutch solenoid valve current monitor ...

How to Follow Test Groups in Trouble Diagnosis
Test group number and test group title Test group number and test group title are shown in the upper portion of each test group. Work and diagnosis procedure Start to diagnose a problem using procedures indicated in enclosed test groups. Questions and results ...

© 2014-2025 Copyright www.nisentra.com