DTC C2111: Brake Fluid Pressure Sensor Power Supply Circuit (Low input); DTC C2112 Brake Fluid Pressure Sensor Power Supply Circuit (High input): Diagnosis

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. Using scan tool MB991958, diagnose the CAN bus lines. 

   Use scan tool to diagnose the CAN bus lines.

   Q: Is the check result normal? 

   1. YES:  Go to  Step 3.
   2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
2. STEP 2. DTC recheck after resetting CAN bus lines 

   Q: Is the DTC C2111 or C2112 set? 

   1. YES:  Go to Step 3.
   2. NO:  The procedure is complete.
3. STEP 3. Battery check 

   Refer to BATTERY TEST .

   Q: Is the battery in good condition? 

   1. YES:  Go to Step 4.
   2. NO:  Charge or replace the battery, and then go to  Step 6.
4. STEP 4. Charging system check 

   Refer to GENERATOR OUTPUT LINE VOLTAGE DROP TEST .

   Q: Is the charging system in good condition? 

   1. YES:  Go to Step 5.
   2. NO:  Repair or replace the charging system component(s), and then go to  Step 6.
5. STEP 5. Check whether the DTC is reset. 

   Erase the DTC.

   Q: Is the DTC C2111 or C2112 set? 

   1. YES:  Replace the hydraulic unit (integrated with ASC-ECU) (Refer to HYDRAULIC UNIT  ), and then go to Step 6.
   2. NO:  Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
6. STEP 6. Check whether the DTC is reset. 

   Erase the DTC.

   Q: Is the DTC C2111 or C2112 set? 

   1. YES:  Return to  Step 1.
   2. NO:  The procedure is complete.