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DTC U0168: WCM/F.A.S.T. CAN timeout
 
 
caution
  • If DTC No. U0168 is stored, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
The combination meter stores DTC No.U0100 when it cannot receive signals from the KOS-ECU.
 
 
JUDGMENT CRITERIA
With the ignition switch is at ON position, DTC No. U1190 is not stored and DTC No. U1195 is not stored, if the communication with KOS-ECU cannot be established for 2500 ms or more, the combination meter determines that a problem has occurred.
 
 
TROUBLESHOOTING HINTS
  • The CAN bus line may be defective.
  • The combination meter may be defective.
  • The KOS-ECU may be defective.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-III), read the KOS diagnostic trouble code
Check if DTC is stored in the KOS-ECU.
Is the DTC stored?
Troubleshoot the KOS. Refer to GROUP 42B - DTC Chart .
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code
Check if DTC No. U0168 is stored in the ETACS-ECU.
Is the DTC stored?
Go to Step 4.
Go to Step 5.
 
STEP 4. Recheck for diagnostic trouble code.
Recheck if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) On completion, check that the DTC is not reset.
Is the DTC stored?
Replace KOS-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-ECU and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
 
STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) On completion, check that the DTC is not reset.
Is the DTC stored?
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-ECU and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
 
STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) On completion, check that the DTC is not reset.
Is the DTC stored?
Go to Step 1.
The procedure is complete.