Code No.U0168
WCM/KOS 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&OSS-ECU cannot be received, the combination meter sets
diagnosis code No. U0168.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, diagnosis code No. U1190 is not set
and diagnosis code No. U1195 is not set, if the communication with KOS&OSS-ECU
cannot be established for 2500 ms or more, the combination meter determines that a problem has
occurred.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of the KOS&OSS-ECU
- Malfunction of combination meter
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
).
Repair the CAN bus line and go to Step 6.
STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set in the KOS&OSS-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the KOS. Refer to GROUP 42B -
Diagnosis Code Chart
.
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
ETACS-ECU
- Code No.U0168: WCM/KOS CAN timeout
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)On completion, check that the diagnosis code is not set again.
|
Q.
Is the diagnosis code set?
Replace KOS&OSS-ECU and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the KOS&OSS-ECU and the combination meter (Refer to GROUP
00 -
How to use troubleshooting/Inspection Service Points
).
STEP 5. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)On completion, check that the diagnosis code is not set again.
|
Q.
Is the diagnosis code set?
Replace combination meter and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the KOS&OSS-ECU and the combination meter (Refer to GROUP
00 -
How to use troubleshooting/Inspection Service Points
).
STEP 6. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not set again.
|
Q.
Is the diagnosis code set?
Go to Step 1.
The procedure is complete.