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 data list 

   Item No. 32: Drive mode switch (Refer to DATA LIST REFERENCE TABLE  .)

   Q: Is the check result normal? 

   1. YES:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
   2. NO:  Go to Step 3.
3. STEP 3. Twin clutch SST control mode switch check 

   Refer to SENSOR, SWITCH AND RELAY .

   Q: Is the check result normal? 

   1. YES:  Go to Step 4.
   2. NO:  Replace the twin clutch SST control mode switch. (Refer to SENSOR, SWITCH AND RELAY .)
4. STEP 4. Twin clutch SST control mode switch connector check: C-49-2 

   Check for the contact with terminals.

   Q: Is the check result normal? 

   1. YES:  Go to Step 5.
   2. NO:  Repair the defective connector.
5. STEP 5. Retest the system 

   Q: Does a malfunction take place again? 

   1. YES:  Go to Step 6
   2. NO:  The inspection is complete.
6. STEP 6. Trouble symptom recheck after replacing the shift lever assembly 
   1. Replace the shift lever assembly. (Refer to >> A << TRANSAXLE CONTROL CABLE (TRANSAXLE SIDE/SHIFT LEVER SIDE) INSTALLATION .)
   2. Verify that the condition described by the customer exists.

   Q: Does a malfunction take place again? 

   1. YES:  Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)