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 shifted in the 4th gear.
   3. Check that the DTC is stored again.

   Q: Is DTC No. P1879 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. 3: Line pressure Test. (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":  Go to Step 4
   2. "No":  DTC No. P181B: Carry out the troubleshooting for the DTC No. P181B: Clutch 1 (Pressure low range out). (Refer to DTC P181B: CLUTCH 1 (PRESSURE LOW RANGE OUT) .)
4. STEP 4. Replace the clutch assembly, and check if the DTC is stored again. 
   1. Replace the clutch assembly. (Refer to TRANSAXLE .)
   2. Drive with shifted in the 4th gear.
   3. Check the DTC.

   Q: Is DTC No. P1879 stored? 

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