Dtc C1A50 Brake System Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Pre-Crash Safety. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (VSC SYSTEM)

CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

REPLACE DRIVING SUPPORT ECU ASSEMBLY

CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

DTC C1A50 Brake System Malfunction


DESCRIPTION

When the pre-crash safety system is operating, the driving support ECU assembly sends brake control signals to the master cylinder solenoid (skid control ECU).
When the driving support ECU assembly receives a VSC system malfunction signal from the master cylinder solenoid (skid control ECU) via CAN communication, DTC C1A50 is stored.

DTC No.
DTC Detection Condition
Trouble Area
C1A50
While the engine switch is on (IG), the driving support ECU assembly receives a VSC system malfunction signal from the master cylinder solenoid (skid control ECU) for 0.2 seconds or more.
  1. Vehicle stability control system
  2. Master cylinder solenoid (skid control ECU)
  3. Driving support ECU assembly

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  2. First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.
    1. for LHD: Click here
    2. for RHD: Click here
  3. After replacing the master cylinder solenoid, perform zero point calibration and store the system information (Click here).
1.CHECK DTC OUTPUT (VSC SYSTEM)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.

  1. Check for vehicle stability control system DTCs (Click here).

Result
Result
Proceed to
Vehicle stability control system DTCs are not output
A
Vehicle stability control system DTCs are output
B


B
GO TO VEHICLE STABILITY CONTROL SYSTEM (Click here)
A


2.CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

  1. Clear the DTCs (Click here).

  1. Make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the system cannot detect the malfunction.

  1. Check for DTCs (Click here).

Result
Result
Proceed to
DTC C1A50 is output
A
DTC C1A50 is not output
B


B
USE SIMULATION METHOD TO CHECK (SYMPTOM SIMULATION) (Click here)
A


3.REPLACE DRIVING SUPPORT ECU ASSEMBLY

  1. Replace the driving support ECU assembly (Click here).


NEXT


4.CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

  1. Clear the DTCs (Click here).

  1. Make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the system cannot detect the malfunction.

  1. Check for DTCs (Click here).

Result
Result
Proceed to
DTC C1A50 is not output
A
DTC C1A50 is output (for LHD)
B
DTC C1A50 is output (for RHD)
C


B
REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) (Click here)
A

END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)