ASCD Vehicle Speed Sensor

P1574 ASCD VEHICLE SPEED SENSOR





Description
The ECM receives two vehicle speed signals by 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 control. System Description for ASCD functions.




DTC Logic

DTC DETECTION LOGIC

NOTE:
- If DTC P1574 is displayed with DTC UXXXX, perform the trouble diagnosis for DTC UXXXX.
- If DTC P1574 is displayed with DTC P0500, perform the trouble diagnosis for DTC P0500. P0500.
- If DTC P1574 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605. P0605.
- If DTC P1574 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. P0607.






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
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 (VDC 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 - Proceed to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK DTC WITH TCM
Check DTC with TCM. Scan Tool Testing and Procedures.
Is the inspection result normal?
YES - GO TO 2.
NO - Perform Diagnosis Procedure corresponding to the DTC indicated.
2.CHECK DTC WITH "ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)"
Scan Tool Testing and Procedures.
Is the inspection result normal?
YES - GO TO 3.
NO - Perform Diagnosis Procedure corresponding to the DTC indicated.
3.CHECK DTC WITH "COMBINATION METER"
Scan Tool Testing and Procedures.
- INSPECTION END