Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

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

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.
STEP 2. Monitoring unit No. check
1. Check the freeze frame data (item No. 30 to No. 37).
2. Check which monitoring unit (No. 161, No. 174, No. 184, or No. 185) is set.
Q: Which monitoring unit is set, No. 161, No. 174, No. 184, or No. 185?
1. No. 161: Go to Step 4
2. Other than No. 161: Go to Step 3
STEP 3. Check whether the DTC is stored again.
1. Erase the DTC.
2. Drive with shifting to each gear range.
3. Check that the DTC is stored again.
Q: Is DTC No. P183D stored?
1. YES: Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
2. NO: Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 4. Check whether the DTC is stored again.
1. Erase the DTC.
2. Drive in the 3rd gear.
3. Check that the DTC is stored again.
Q: Is DTC No. P183D stored?
1. YES: Go to Step 5.
2. NO: Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 5. 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 6.
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) .)
STEP 6. Scan tool Teach-In
1. Carry out the Item No. 1: Plausibility check. (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": Replace the transaxle assembly. (Refer to << B >> TRANSAXLE ASSEMBLY CONNECTOR REMOVAL
2. "No": Go to Step 7.
STEP 7. Replace the mechatronic assembly, and check if the DTC is stored again.
1. Replace the mechatronic assembly. (Refer to << A >> MECHATRONIC ASSEMBLY REMOVAL .)
2. Drive in the 3rd gear.
3. Check the DTC.
Q: Is DTC No. P183D stored?
1. YES: Replace the transaxle assembly. (Refer to << B >> TRANSAXLE ASSEMBLY CONNECTOR REMOVAL
2. NO: This diagnosis is complete.