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DTC U0101: Transaxle control module CAN timeout
 
 
caution
  • If DTC U0101 is set in the ETACS-ECU, always diagnose the CAN bus line.
  • Before replacing the ECU, ensure that the communication circuit is normal.
 
 
TROUBLE JUDGMENT
If the signal from transaxle control module cannot be received, the ETACS-ECU sets DTC U0101.
 
 
JUDGMENT CRITERIA
After the following statuses continue to be true for 5 seconds, if the communication with the transaxle control module cannot be established for 0.6 second or more, the ETACS-ECU determines that a problem has occurred.
  • No abnormality is present to the network.
  • Ignition switch is in the ON position.
  • No abnormality is present to the power supply fuse (IOD fuse), or the odometer value is at 80.5 km (50.0 miles) or more.
  • ETACS-ECU system voltage is at 10-16 volts.
 
 
TROUBLESHOOTING HINTS
  • The transaxle control module may be defective.
  • The ETACS-ECU may be defective.
  • The CAN bus may be defective.
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. 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 MB991958, read the transaxle control module diagnostic trouble code.
Check if DTC is set in the transaxle control module.
Is the DTC set?
Troubleshoot the automatic transaxle. (Refer to GROUP 23A, Diagnosis ).
Go to Step 3.
 
STEP 3. Using scan tool MB991958, read the engine control module diagnostic trouble code.
Check if DTC U0101 is set in the engine control module.
Is the DTC set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set in the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Replace the transaxle control module.
The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the transaxle control module and the ETACS-ECU. (Refer to GROUP 00, How to Cope with Intermittent Malfunction )
 
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set in the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the transaxle control module and the ETACS-ECU. (Refer to GROUP 00, How to Cope with Intermittent Malfunction )