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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 (refer to GROUP 35C - On-vehicle Service ), 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 .)

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



DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .)

STEP 2. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. U1003 is set.(Refer to .)

Q. Is the DTC set?
Perform the relevant troubleshooting.
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.(Refer to .)

Q. Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. Scan tool service data
Check the service data below.(Refer to .)

  • Item No. 26: Yaw rate sensor
  • Item No. 29: Lateral G sensor
  • Item No. 31: Longitudinal G sensor

Q. Is the check result normal?
Go to Step 5.
Replace the G and yaw rate sensor. (Refer to GROUP 35C - G and Yaw Rate Sensor .) Then go to Step 6.

STEP 5. Check whether the DTC is reset.

Q. Is DTC No. U0428 set?
Replace the AWC-ECU.(Refer to .) Then go to Step 6.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 6. Check whether the DTC is reset.

Q. Is DTC No. U0428 set?
Return to Step 1.
This diagnosis is complete.