U1428

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

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 Active Stability Control System (ASC))

OPERATION

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

DTC SET CONDITIONS

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

PROBABLE CAUSES

- Malfunction of G and yaw rate sensor
- Malfunction of ASC-ECU
- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart).
STEP 2. Scan tool diagnostic trouble code

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

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 3.
STEP 3. Scan tool diagnostic trouble code

Check if the ACD diagnostic trouble code No. C123C, C1242 is set. (Refer to Active Center Differential (ACD)).

Q. Is the check result normal?

YES Perform the relevant troubleshooting.
NO Go to Step 4.
STEP 4. Scan tool data list

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

- Item No.26: Yaw rate sensor
- Item No.29: Lateral G sensor
- Item No.31: 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 DTC is reset.

Q. Is DTC No.U1428 set?

YES Replace the AWC-ECU. (Refer to Twin Clutch-Sportronic Shift Transmission (TC-SST)). Then go to Step 6.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions).
STEP 6. Check whether the DTC is reset.

Q. Is DTC No.U1428 set?

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