U1428

Code No.U1428: G and Yaw Rate Sensor Data Malfunction

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.

- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

- Do not drop the G and yaw rate sensor or subject it to a shock.

- When G and yaw rate sensor is replaced, calibrate G and yaw rate sensor (refer to On-vehicle Service Testing and Inspection)

OPERATION

AWC-ECU receives the G and yaw rate sensor data from ASC-ECU via the CAN communication.

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

The code is set when abnormality is detected in the G and yaw rate sensor signal received from the ASC-ECU.

PROBABLE CAUSES

- Malfunction of G and yaw rate sensor

- Malfunction of G and yaw rate sensor power supply

- Damaged connector(s)

- Malfunction of the CAN bus line

- Malfunction of AWC-ECU

- Malfunction of ASC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.

Use scan tool to perform the CAN bus diagnosis.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart).
STEP 2. M.U.T.-III diagnostic trouble code.

Check the ASC diagnostic trouble code. Active Stability Control System (ASC)).

Q. Is the diagnostic trouble code set?

YES Perform the relevant troubleshooting.
NO Go to Step 3.
STEP 3. M.U.T.-III diagnostic trouble code.

Check if the AWC diagnostic trouble code No.C123C, C1242 is set. (Refer to Automatic Transmission).

Q. Is the check result normal?

YES Perform the relevant troubleshooting.
NO Go to Step 4.
STEP 4. M.U.T.-III data list.

Check the data list below. (Refer to Data List Reference Table).

- Item No.25: Yaw rate sensor

- Item No.26: Lateral G sensor

- Item No.27: Longitudinal G sensor

Q. Is the check result normal?

YES Go to Step 5.
NO Replace the G and yaw rate sensor. Service and Repair). Then go to Step 6.
STEP 5. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.U1428 set?

YES Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 6.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions).
STEP 6. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.U1428 set?

YES Return to Step 1.
NO This diagnosis is complete.