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DTC U0101: T/M CAN timeout
 
 
caution
  • If DTC U0101 is stored in the combination meter, always diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.
 
 
 
 
DIAGNOSTIC FUNCTION
The combination meter stores DTC No.U0101 when it cannot receive signals from the TCM.
 
 
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 TCM 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 TCM 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 CVT diagnostic trouble code
Check if DTC is stored in the TCM.
Is the DTC stored?
Diagnose the CVT system (GROUP 23A - Troubleshooting ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if DTC No. U0101 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 TCM and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the TCM 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 TCM and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
 
STEP 6. Check whether the DTC is reset.
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.