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 diagnostic trouble code 

   Check the shift lever diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE .)

   Q: Is the DTC set? 

   1. YES:  Perform the relevant troubleshooting.
   2. NO:  Go to Step 3.
3. STEP 3. Inspection of the TC-SST-ECU connector, intermediate connector, and shift lever-ECU connector: B-120, A-54, C-49 

   Check for the contact with terminals.

   Q: Is the check result normal? 

   1. YES:  Go to Step 4.
   2. NO:  Repair the defective connector.
4. STEP 4. Check the wiring harness between B-120 TC-SST-ECU connector terminal No. 17 and C-49 shift lever-ECU connector terminal No. 16. 

   Check the communication line for open and short circuit.

   Q: Is the check result normal? 

   1. YES:  Go to Step 5.
   2. NO:  Repair the wiring harness.
5. STEP 5. Check whether the DTC is reset. 

   30 seconds after turning ON the ignition switch, check that the DTC is reset.

   Q: Is DTC No. P1803 set? 

   1. YES:  Replace the shift lever assembly. (Refer to >> A << TRANSAXLE CONTROL CABLE (TRANSAXLE SIDE/SHIFT LEVER SIDE) INSTALLATION .)
   2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)