Code No.U1415 Variant coding not implemented


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 ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

  • Electric power steering-ECU receives variant coding data from the ETACS-ECU.

FUNCTION

  • The coding data is sent to the electric power steering-ECU for motor control.

TROUBLE JUDGEMENT
Check Conditions
  • The power supply circuit system diagnosis code (No. C1540, C1541) is not set.
  • The ETACS circuit system diagnosis code is not set.
Judgement Criterion
  • The electric power steering-ECU coding is not completed.
  • The coding data is not sent from the ETACS-ECU, and the microcomputer determines that there is a problem in the system.
Fail Safe, Back Up Function
  • The electric power steering-ECU stops the motor control and illuminates the EPS warning display, then sets the diagnosis code No. U1415.

PROBABLE CAUSES

  • Malfunction of CAN bus line
  • Malfunction of the electric power steering-ECU
  • Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to 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 ). On completion, go to Step 4.

STEP 2. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that the diagnosis code No.B222C is set in the ETACS-ECU.

Q. Is any diagnosis code set?
Troubleshoot the relevant diagnosis code, and then go to Step 4.
Go to Step 3.

STEP 3. Diagnosis code recheck after resetting CAN bus lines
(1)Erase the diagnosis code.
(2)Turn the ignition switch from LOCK (OFF) to ON and hold it for 1 minute, and turn it from ON to LOCK (OFF) and hold it for 1 minute. Then, turn the ignition switch from LOCK (OFF) to ON.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis codes U1415 set?
Go to Step 4.
This diagnosis is complete.

STEP 4. Check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis codes U1415 set?
Replace the electric power steering-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.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis codes U1415 set?
Return to Step 1.
This diagnosis is complete.