Code No.U1417 Implausible coding data


caution
  • If diagnosis code U1417 is set in CAN box unit, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.
  • When the diagnosis code U1417 is set in CAN box unit, the diagnosis code may also be set in ETACS-ECU. When the diagnosis code is set in ETACS-ECU, carry out the diagnosis of the diagnosis code for ETACS-ECU first.

CIRCUIT OPERATION



JUDGMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of ETACS-ECU
  • Malfunction of the ETACS-ECUs have been interchanged between two vehicles.
  • Malfunction of the CAN box unit
  • External noise interference

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

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

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?
Troubleshoot the ETACS (Refer to ETACS, Diagnosis ).
NO : Go to Step 3.

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

Q. Is the diagnosis code set?
Replace CAN box unit.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).