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


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis 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).

OPERATION


AWC-ECU communicates with ASC-ECU via the CAN bus lines.

DIAGNOSIS 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



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

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

STEP 2. M.U.T.-III diagnosis code.
Check the ASC diagnosis code. (Refer to GROUP 35C - Troubleshooting ).

Q. Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code.
Check if AWC diagnosis code No.C123C, C1242 is set. (Refer to .)

Q. Is the check result normal?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. M.U.T.-III data list.
Check the data list below. (Refer to .)

  • Item No.22: Yaw rate sensor
  • Item No.23: Lateral G sensor
  • Item No.24: Longitudinal G sensor

Q. Is the check result normal?
Go to Step 5.
Replace the hydraulic unit (incorporating G and yaw rate sensor). (Refer to GROUP 35C - Hydraulic Unit). Then go to Step 6.

STEP 5. Check whether the diagnosis code is set again.

Q. Is diagnosis code No.U1428 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 diagnosis code is set again.

Q. Is diagnosis code No.U1428 set?
Return to Step 1.
This diagnosis is complete.