U1428

DTC 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 and initialize the lateral/longitudinal acceleration correction amount stored in AWC-ECU. (Refer to item No.2: Lateral acceleration correction amount initialization, and No.3: Longitudinal acceleration correction amount initialization Special Function Reference Table)

OPERATION
AWC-ECU communicates with the G and yaw rate sensor via the CAN bus lines.

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 the CAN bus line (local)
^ Malfunction of G and yaw rate sensor
^ 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 if the AWC diagnostic trouble code No. U1003 is set.(Diagnostic Trouble Code Descriptions)
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 AWC diagnostic trouble code No. C123C, C1242, C2114, C2115, or C2204 is set.(Diagnostic Trouble Code Descriptions)
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 4.

STEP 4. Scan tool service data
Check the service data below. (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. U0428 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. U0428 set?
YES: Return to Step 1.
NO: This diagnosis is complete.