Nissan Sentra B18 (2020-2025) Service Manual: P1574 Ascd Vehicle Speed Sensor

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P1574 Ascd Vehicle Speed Sensor

Dtc Description

DTC Description

The ECM receives two ASCD vehicle speed sensor signals via CAN communication line. One is sent from combination meter, and the other is from TCM (with ICC models). The ECM uses these signals for ASCD control. Refer to System Description. for ASCD functions.

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1574	ASCD VHL SPD SEN (ASCD Nissan Sentra vehicle speed sensor)	Diagnosis condition	Nissan Sentra Vehicle speed: More than 40 km/h (25 MPH)
		Signal (terminal)	—
		Threshold	ASCD Nissan Sentra vehicle speed signals are out of the specified range
		Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors (CAN communication line is open or shorted.)
Combination meter
Wheel sensor
ABS actuator and electric unit (control unit)
TCM (without ICC)

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

CHECK DTC PRIORITY

If DTC P1574 is displayed with DTC P0500, P0605 or P0607, first perform the trouble diagnosis for DTC P0500, P0605 or P0607.

Is applicable DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P0500: Refer to DTC Description.
- DTC P0605: Refer to DTC Description.
- DTC P0607: Refer to DTC Description.
NO >>
GO TO 2.
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 3.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Drive the Nissan Sentra 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 Nissan Sentra vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.
3. Check DTC.
Is DTC detected?
YES >>
Proceed to DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P1574 is displayed with DTC P0500, P0605 or P0607, first perform the trouble diagnosis for DTC P0500, P0605 or P0607.

Is applicable DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P0500: Refer to DTC Description.
- DTC P0605: Refer to DTC Description.
- DTC P0607: Refer to DTC Description.
NO >>
GO TO 2.
CHECK DTC WITH TCM (WITH ICC MODELS)

Check DTC with TCM. Refer to CONSULT Function.

Is the inspection result normal?
YES >>
GO TO 3.
NO >>
Perform trouble shooting relevant to DTC indicated.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Check DTC with ABS actuator and electric unit (control unit). Refer to CONSULT Function.

Is the inspection result normal?
YES >>
GO TO 4.
NO >>
Perform trouble shooting relevant to DTC indicated.
CHECK DTC WITH COMBINATION METER

Check DTC with combination meter. Refer to CONSULT Function (METER/MA)(TYPE A) or Refer to CONSULT Function (METER/MA)(TYPE B).

>>
INSPECTION END

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