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 reset. 
   1. Erase the DTC.
   2. After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.

   Q: Is DTC No. P1890 set? 

   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. Perform Teach-In (the same item as the mechatronic assembly replacement). (Refer to TC-SST TEACH-IN .)
   2. After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.

   Q: Is DTC No. P1890 set? 

   1. YES:  Go to Step 4.
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
4. STEP 4. Replace the mechatronic assembly, and check if the DTC is reset. 
   1. Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
   2. After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.

   Q: Is DTC No. P1890 set? 

   1. YES:  Go to Step 5.
   2. NO:  This diagnosis is complete.
5. STEP 5. Replace the clutch assembly, and check if the DTC is reset. 
   1. Replace the clutch assembly. (Refer to TRANSAXLE .)
   2. After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.

   Q: Is DTC No. P1890 set? 

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