35C-DTC U0428: COMMUNICATION ERROR IN STEERING WHEEL SENSOR

DTC U0428 SAS (CAN Message)

caution

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
If DTC U0428 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable.
Before replacing the ECU, ensure that the communication circuit is normal.
When the column switch assembly (integrated with steering wheel sensor) is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).

OPERATION

The steering wheel sensor outputs the steering wheel status to ASC-ECU via the CAN bus lines.

DTC SET CONDITIONS

The ASC-ECU will set the DTC when it receives an implausible CAN signal from the steering wheel sensor.

PROBABLE CAUSES

DIAGNOSIS

STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.

Use scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.

Is the check result normal?

Go to Step 2

Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table

STEP 2. Check whether the DTC is set again.

(1) Erase the DTC.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

(3) Turn the ignition switch to the "ON" position.

Is DTC U0428 set?

Replace the column switch assembly (integrated with steering wheel sensor) (Refer to GROUP 54A - Column Switch

) and then go to Step 3

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

STEP 3. Check whether the DTC is set again.

(1) Erase the DTC.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

(3) Turn the ignition switch to the "ON" position.

Is DTC U0428 set?

Replace the hydraulic unit (integrated with ASC-ECU) (Refer to

This diagnosis is complete.