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. 
   1. Erase the DTC.
   2. Drive with shifting to each gear range. (Hold each gear range for 5 seconds or more.)
   3. Check that the DTC is stored again.

   Q: Is DTC No. P1858 stored? 

   1. YES:  Go to Step 3.
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
3. STEP 3. Scan tool diagnostic trouble code 

   Check if any code from P1836, P183D, P1844, or P184B is stored in addition to the DTC No. P1858.

   Q: Check if any code from P1836, P183D, P1844, or P184B is stored in addition to the DTC No. P1858. 

   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