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. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to Step 2.
2. STEP 2. Scan tool diagnostic trouble code 

   Check the engine diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE .)

   Q: Is the DTC stored? 

   1. YES:  Perform the relevant troubleshooting.
   2. NO:  Go to Step 3.
3. STEP 3. Fluid check 

   Drain the fluid and check that no bubbles, foreign material and contamination are found.

   Q: Is the check result normal? 

   1. YES:  Go to Step 4.
   2. NO:  Replace the fluid.
4. STEP 4. Check whether the DTC is stored again. 
   1. Erase the DTC.
   2. Gradually accelerate the vehicle.
   3. Accelerate the vehicle with the accelerator pedal fully opened.
   4. Check that the DTC is stored again.

   Q: Is DTC No. P0846 stored? 

   1. YES:  Replace the clutch assembly. (Refer to TRANSAXLE .)
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)