Code No.U0019
Bus off (CAN-B)
| caution |
- If diagnosis
code No. U0019 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
|
DIAGNOSIS FUNCTION
WCM sets the diagnosis code No. U0019 when a failure occurred in the CAN-B circuit.
JUDGEMENT CRITERIA
WCM determines that the abnormality is present when normal data transmission has become impossible
due to failure in the CAN-B bus circuit.
PROBABLE CAUSES
Malfunction of CAN bus line
DIAGNOSIS PROCEDURE
STEP 1. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
|
(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?
Go to Step 2.
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use
Troubleshooting/Inspection Service Points 
).
STEP 2. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use
Troubleshooting/Inspection Service Points ).
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting ).