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.

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.

STEP 2. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code.
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 Diagnostic Trouble Code Descriptions).
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. Then go to Step 6.

STEP 5. Check whether the DTC is reset.
Q: Is DTC No.U1428 set?
YES: Replace the AWC-ECU. Then go to Step 6.
NO: Intermittent malfunction.

STEP 6. Check whether the DTC is reset.
Q: Is DTC No.U1428 set?
YES: Return to Step 1.
NO: This diagnosis is complete.