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. Monitoring unit No. check 
   1. Check the freeze frame data (item No. 30 to No. 37).
   2. Check which monitoring unit (No. 114 or No. 138) is set.

   Q: Which monitoring unit is set, No. 114 or No. 138? 

   1. No. 114:  Go to  Step 4
   2. No. 138:  Go to Step 3
3. STEP 3. Check whether the DTC is stored again. 
   1. Erase the DTC.
   2. Drive the vehicle at 50 km/h (31 mph) or more.
   3. Check that the DTC is stored again.

   Q: Is DTC No. P0716 stored? 

   1. YES:  Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
4. STEP 4. Check whether the DTC is stored again. 
   1. Erase the DTC.
      CAUTION: When driving with each gear range, check that the gear engagement is correct and the engine rotation speed does not increase abnormally after gear shifting.
   2. Drive with shifting to each gear range.
   3. Check that the DTC is stored again.

   Q: Is DTC No. P0716 stored? 

   1. YES:  Go to Step 5.
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
5. STEP 5. Scan tool Teach-In 
   1. Carry out the Item No. 1: Plausibility check. (Refer to (TEACH-IN REFERENCE TABLE ).)
   2. After Teach-In, check which result ("Yes" or "No") is displayed in the Data list No. 101: Normal End. (Refer to (TEACH-IN REFERENCE TABLE ).)

   Q: Which is displayed, "Yes" or "No"? 

   1. "Yes":  Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
   2. "No":  Replace the transaxle assembly. (Refer to << B >> TRANSAXLE ASSEMBLY CONNECTOR REMOVAL .)