DTC U0100: Engine time-out error; DTC U0141: ETACS time-out error: Diagnosis

Required Special Tools: 

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

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 

   Use scan tool to diagnose the CAN bus lines.

   Q: Is the check result normal? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to  Step 4.
2. STEP 2. Check whether the DTC is reset. 

   Q: Is DTC U0100 or U0141 set? 

   1. YES:  Go to Step 3.
   2. NO:  The procedure is complete.
3. STEP 3. Using scan tool MB991958, check the other system DTC 

   Use scan tool to check that other DTC is set in the ECU corresponding to the relevant diagnosis.

   Q: Is other DTC set? 

   1. YES:  Troubleshoot for the relevant DTC.
   2. NO:  Go to Step 4.
4. STEP 4. Using scan tool MB991958, check the DTC 

   Use scan tool MB991958 to check if the same DTC (time-out) is set in the other ECU (CAN-C).

   Q: Is any DTC set? 

   1. YES (DTC U0100 is set):  Replace the engine control module (ECM), and then go to Step 5.
   2. YES (DTC U0141 is set):  Replace the ETACS-ECU, and then go to Step 5.
   3. NO (No DTC is set.):  Go to Step 5.
5. STEP 5. Check whether the DTC is reset. 

   Erase the DTC.

   Q: Is DTC U0100 or U0141 set? 

   1. YES:  Replace the hydraulic unit (integrated with ABS-ECU) (Refer to HYDRAULIC UNIT  ).
   2. NO:  The procedure is complete.