DTC Description

DESCRIPTION

The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from ACTIVE STABILITY CONTROL SYSTEM (ASC), and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD/ACC control. Refer to the following.

ASCD functions: Refer to System Description.
ACC functions: Refer to System Description.

DTC DETECTION LOGIC

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P1574	00	ASCD VHL SPD SEN (ASCD VHL SPD SEN)	Diagnosis condition	Vehicle speed: More than 40 km/h (25 MPH)
			Signal (terminal)	—
			Threshold	ASCD/ACC vehicle speed signals are out of the specified range
			Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors (CAN communication line is open or shorted.)
ABS actuator and electric unit (control unit)
TCM
ECM

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

1.CHECK DTC PRIORITY

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

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Index

2.PRECONDITIONING

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

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

3.PERFORM DTC CONFIRMATION PROCEDURE

Start engine.
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.
Check DTC.

Is DTC detected?

Proceed to DTC Diagnosis Procedure

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END