Diagnostic Procedure

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. Scan tool CAN bus diagnostics 

   Using scan tool MB991958, diagnose the CAN bus lines.

   Q: Is the check result normal? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.
2. STEP 2. Check whether the DTC is stored again. 

   After driving in the 4th gear, check that the DTC is stored again.

   Q: Is DTC No. P2809 stored? 

   1. YES:  Go to Step 3.
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
3. STEP 3. Check the fluid. 

   Q: Is the fluid level proper? 

   1. YES:  Go to Step 4.
   2. NO:  Add the fluid.
4. STEP 4. Check the installation status of the mechatronic assembly. 

   Q: Is the mechatronic assembly installed correctly? 

   1. YES:  Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
   2. NO:  Install the mechatronic assembly correctly. (Refer to >> B << GASKET A/GASKET C/MECHATRONIC ASSEMBLY INSTALLATION .)