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. Check whether the DTC is reset. 

   After 5 or more seconds have passed with the engine idle status, check that the DTC is reset.

   Q: Is DTC No. P1881 set? 

   1. YES:  Go to Step 3.
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
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. Shift lever assembly replacement 
   1. Replace the shift lever assembly. (Refer to >> A << TRANSAXLE CONTROL CABLE (TRANSAXLE SIDE/SHIFT LEVER SIDE) INSTALLATION .)
   2. Check if the DTC is set.

   Q: Is DTC No. P1881 set? 

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