Dtc C1A73 Driving Support Ecu Receive Data Malfunction

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
Cruise Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (LANE DEPARTURE ALERT SYSTEM)

REPLACE FORWARD RECOGNITION CAMERA

CHECK DTC OUTPUT (LANE DEPARTURE ALERT SYSTEM)

DTC C1A73 Driving Support ECU Receive Data Malfunction


DESCRIPTION

If a communication error between the driving support ECU assembly and another ECU is detected, DTC C1A73 is stored.

DTC No.
DTC Detection Condition
Trouble Area
C1A73
When the engine switch is on (IG) for 2 seconds or more, a communication malfunction between the forward recognition camera and the driving support ECU assembly is detected for 5 seconds or more.
  1. CAN communication system
  2. Forward recognition camera
  3. Driving support ECU assembly

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  2. If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera learning (Click here).
  3. 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 the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  4. 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 (Click here).
1.CHECK DTC OUTPUT (LANE DEPARTURE ALERT 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 / LKA/LDA / Trouble Codes.

  1. Clear the DTCs (Click here).

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

    HINT:
    If the following procedure is not performed, the previously output DTC cannot be detected.
    1. Turn the engine switch on (IG) and wait 7 seconds or more.

  1. Check for DTCs (Click here).

Result
Result
Proceed to
DTC C1A73 is output
A
DTC C1A73 is not output
B


B
USE SIMULATION METHOD TO CHECK (Click here)
A


2.REPLACE FORWARD RECOGNITION CAMERA

  1. Replace the forward recognition camera (Click here).

  1. Adjust the forward recognition camera (Click here).


NEXT


3.CHECK DTC OUTPUT (LANE DEPARTURE ALERT 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 / LKA/LDA / Trouble Codes.

  1. Clear the DTCs (Click here).

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

    HINT:
    If the following procedure is not performed, the previously output DTC cannot be detected.
    1. Turn the engine switch on (IG) and wait 7 seconds or more.

  1. Check for DTCs (Click here).

Result
Result
Proceed to
DTC C1A73 is output
A
DTC C1A73 is not output
B


B
END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)
A

REPLACE DRIVING SUPPORT ECU ASSEMBLY (Click here)