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. P1835 stored? 

   1. YES:  Go to Step 3.
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
3. STEP 3. 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 transaxle assembly. (Refer to << B >> TRANSAXLE ASSEMBLY CONNECTOR REMOVAL
   2. "No":  Go to Step 4.
4. STEP 4. Replace the mechatronic assembly, and check if the DTC is stored again. 
   1. Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
   2. Drive in the 4th gear.
   3. Check the DTC.

   Q: Is DTC No. P1835 stored? 

   1. YES:  Replace the transaxle assembly. (Refer to << B >> TRANSAXLE ASSEMBLY CONNECTOR REMOVAL
   2. NO:  This diagnosis is complete.