P1574

P1574 ASCD Vehicle Speed Sensor

Component 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 [ASCD: System Description] ASCD System Description for ASCD functions.

On Board Diagnosis Logic

This self-diagnosis has the one trip detection logic.

The MIL will not illuminate for this diagnosis.

NOTE:

- If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
- If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to [P0607 ECM] P0607.
- If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to [P0500 VSS] P0500.
- If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to [P0605 ECM] P0605.





DTC Confirmation Procedure

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

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

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.

TESTING CONDITION:

Step 3 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) Start engine.
2) Drive the vehicle at more than 40 km/h (25 MPH).
3) Check DTC.
4) If DTC is detected, go to "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK DTC WITH TCM

Check DTC with TCM. Refer to [OBD-II Diagnostic Trouble Code (DTC)] OBD-II Diagnostic Trouble Code (DTC).

OK or NG
OK
GO TO 2.
NG
Perform trouble shooting relevant to DTC indicated.

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

Refer to [Diagnosis and Repair Workflow] Diagnosis and Repair Workflow (TYPE 1), [Diagnosis and Repair Workflow] Diagnosis and Repair Workflow (TYPE 2).

OK or NG
OK
GO TO 3.
NG
Repair or replace.

3. CHECK COMBINATION METER FUNCTION

Refer to [Diagnosis and Repair Workflow: Meter, Warning Lamp and Indicator] Diagnosis and Repair Workflow Meter, Warning Lamp and Indicator.


INSPECTION END