For California

P1574 ASCD VEHICLE SPEED SENSOR

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. For California for ASCD functions.


DTC Logic


DTC DETECTION LOGIC

NOTE:
-If DTC P1574 is displayed with DTC U1001, first perform the trouble diagnosis for DTC U1001. For California.
-If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. For California
.
-If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. For California
.
-If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. For California.






DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine.
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- Go to .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK DTC WITH TCM

Check DTC with TCM. Reading and Clearing Diagnostic Trouble Codes.
Is DTC detected?
NO- GO TO 2.
YES- Perform trouble shooting relevant to DTC indicated.

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

Scan Tool Testing and Procedures.
Is DTC detected?
NO- INSPECTION END
YES- Perform trouble shooting relevant to DTC indicated.