DTC U0141: ETACS CAN time-out: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Scan tool MB991958 CAN bus diagnostics 

   Use scan tool MB991958 to diagnose the CAN bus lines.

   Q: Is the check result normal? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the CAN bus line (Refer to CAN BUS DIAGNOSTICS TABLE ), Then go to Step 2.
2. STEP 2. Scan tool MB991958 data list 

   Check the following data list (Refer to DATA LIST REFERENCE TABLE  ).

   • Item 09: CAN system (ETACS)

   Q: Is the check result normal? 

   1. YES:  Go to  Step 6.
   2. NO:  Go to Step 3.
3. STEP 3. Scan tool MB991958 DTC of other systems 

   Check if a DTC, which relates to the CAN communication-linked systems below, is set.

   • Meter

     U0141: ETACS CAN time-out DTC

   • A/C

     U0141: ETACS CAN time-out DTC

   • Engine

     U0141: ETACS CAN time-out DTC

   Q: Is the DTC set? 

   1. YES:  Go to Step 4.
   2. NO:  Go to  Step 5.
4. STEP 4. Check whether the DTC is reset. 
   1. Erase the DTC.
   2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
   3. Check if the DTC is set.

   Q: Is the DTC U0141 set? 

   1. YES:  Replace ETACS-ECU. Then go to  Step 6.
   2. NO:  A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between ETACS-ECU and AWD-ECU is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
5. STEP 5. Check whether the DTC is reset. 
   1. Erase the DTC.
   2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
   3. Check if the DTC is set.

   Q: Is the DTC U0141 set? 

   1. YES:  Replace AWD-ECU (Refer to AWD-ECU  ). Then go to Step 6.
   2. NO:  A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between ETACS-ECU and AWD-ECU is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
6. STEP 6. Check whether the DTC is reset. 

   Q: Is the DTC U0141 set? 

   1. YES:  Diagnose again from  Step 1.
   2. NO:  This diagnosis is complete.