Code No.U1427: Implausible Wheel Speed Data



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.

OPERATION




DIAGNOSIS CODE SET CONDITION




  • Abnormality is detected in the wheel speed sensor signal received from the ABS/ASC-ECU.

PROBABLE CAUSES



  • Malfunction of the CAN bus line
  • Malfunction of the wheel speed sensor
  • Malfunction of ABS/ASC-ECU
  • Malfunction of 4WD-ECU

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 ).

STEP 2. M.U.T.-III other system diagnosis code.


Check the ABS diagnosis code (Refer to GROUP 35B - Troubleshooting ) <Vehicles with ABS> or the ASC diagnosis code (Refer to GROUP 35C - Troubleshooting ) <Vehicles with ASC>.

Q. Is the diagnosis code set?

Perform the relevant troubleshooting.
Go to Step 3.

STEP 3. M.U.T.-III data list.


Check the data list of the relevant wheel speed sensor (Refer to ).

  • Item No.18: FL Wheel speed sensor
  • Item No.19: FR Wheel speed sensor
  • Item No.20: RL Wheel speed sensor
  • Item No.21: RR Wheel speed sensor

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 4.

STEP 4. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.U1427 set?

Replace the 4WD-ECU (Refer to ). Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.U1427 set?

Return to Step 1.
This diagnosis is complete.