ASCD Vehicle Speed Sensor

DTC P1574 ASCD VEHICLE SPEED SENSOR





Component Description
The ECM receives two vehicle speed sensor signals via the CAN communication line. One is sent from "unified meter and A/C amp.", and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD control. 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 P0500, first perform the trouble diagnosis for DTC P0500. P0500.
- If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. P0605.
- If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. P0607.









DTC Confirmation Procedure

CAUTION:
Always drive vehicle at a safe speed.

NOTE:
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.
TESTING CONDITION:
Step 2 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 (VDC switch OFF).
2. Drive the vehicle at more than 40 km/h (25 MPH).
3. Check DTC.
4. If DTC is detected, go to ASCD Vehicle Speed Sensor.




Diagnosis Procedure
1.CHECK DTC WITH TCM
Check DTC with TCM. 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)"
Trouble Diagnosis.
OK or NG
OK - GO TO 3.
NG - Repair or replace malfunctioning part.
3.CHECK DTC WITH "UNIFIED METER AND A/C AMP."
.
- INSPECTION END