C2112

DTC C2111 Brake Fluid Pressure Sensor Power Supply Circuit (Low input)

DTC C2112 Brake Fluid Pressure Sensor Power Supply Circuit (High input)

CAUTION
^ If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Whenever ECU is replaced, ensure that the CAN bus lines are normal.
^ When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor.

OPERATION
When the brake pedal is depressed, the brake fluid pressure sensor integrated in the hydraulic unit detects the brake fluid pressure applied from the master cylinder, converts the pressure value into voltage signal, and outputs it.

DTC SET CONDITIONS
This DTC is set when the voltage applied to the pressure sensor is not within the standard value range.

PROBABLE CAUSES
ASC-ECU malfunction

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

STEP 1. M.U.T.-III CAN bus diagnosis
Use scan tool to diagnose the CAN bus lines.

Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the CAN bus lines. On completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines

Q: Are the DTCs C2111 or C2112 set?
YES: Go to Step 3.
NO: The procedure is complete.

STEP 3. Battery check

Q: Is the battery in good condition?
YES: Go to Step 4.
NO: Charge or replace the battery, and then go to Step 6.

STEP 4. Charging system check

Q: Is the charging system in good condition?
YES: Go to Step 5.
NO: Repair or replace the charging system component(s), and then go to Step 6.

STEP 5. Check whether the DTC is reset.

Q: Are DTCs C2111 or C2112 set?
YES: Replace the hydraulic unit (ASC-ECU), and then go to Step 6.
NO: Intermittent malfunction.

STEP 6. Check whether the DTC is reset.

Q: Are DTCs C2111 or C2112 set?
YES: Return to Step 1.
NO: The procedure is complete.