Code No.U0168 KOS/WCM CAN timeout


caution
  • If diagnosis code No. U0168 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION


If the signal from KOS-ECU or WCM cannot be received, the combination meter sets the diagnosis code No. U0168.

JUDGMENT CRITERIA


With the statuses that the ignition switch is at ON position, system voltage is 10 - 16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse (IOD fuse), or odometer value is 80.5 km or more, if the communication with KOS-ECU or WCM cannot be established for 2,500 ms or more, the combination meter determines that a problem has occurred.

PROBABLE CAUSES



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 again if the diagnosis code is set to the KOS-ECU <vehicles with KOS> or WCM <vehicles with WCM>.

Q. Is the diagnosis code set?

Set to the KOS-ECU. : Troubleshoot the KOS. Refer to GROUP 42B - Diagnosis Code Chart .

Set to the WCM. : Troubleshoot the WCM. Refer to GROUP 42C - Diagnosis Code Chart .

The diagnosis code is not set. : Go to Step 3.

STEP 3. Check the M.U.T.-III Diagnosis code for other systems


Check if the diagnosis code No. U0168 is set to ETACS-ECU.

Q. Is the diagnosis code set?

Go to Step 4.

Go to Step 5.

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set to the combination meter.
(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 code set?

Replace KOS-ECU or WCM.

A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and KOS-ECU or WCM. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

STEP 5. Diagnosis code recheck


Check again if the diagnosis code is set to the combination meter.
(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 code set?

Replace the combination meter.

A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and KOS-ECU or WCM. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)