PRE-COLLISION SYSTEM, Diagnostic DTC:C1A11, C1A14

DTC Code DTC Name
C1A11 Front Radar Sensor Incorrect Axial Gap
C1A14 Front Radar Sensor Beam Axis Not Adjusted

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly sends pre-collision control operation signals.

When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the airbag sensor assembly (yaw rate sensor) sensor etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the millimeter wave radar sensor assembly beam axis has deviated, the driving support ECU assembly detects this, and stores DTC C1A11.

After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A11 Front Radar Sensor Incorrect Axial Gap When the power switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 2 seconds.

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly
C1A14 Front Radar Sensor Beam Axis Not Adjusted When the vehicle is being driven at a speed of 5 km/h (3 mph) or more, misalignment of the millimeter wave radar sensor assembly is detected for approximately 2 seconds.

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

INSPECTION PROCEDURE

Note


  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed Click here.

  • 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.

PROCEDURE


  1. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Check that the bracket of the millimeter wave radar sensor assembly is not deformed.

      Tech Tips

      If the bracket is deformed, replace the millimeter wave radar sensor assembly Click here.

      OK
      Millimeter wave radar sensor assembly bracket is not deformed.

    NG

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    OK

  2. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment Click here.


    NEXT

  3. CHECK FOR DTC (PRE-COLLISION 2)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

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

      Tech Tips

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

    5. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC C1A11 and C1A14 are not output A
      DTC C1A11 or C1A14 is output B

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    A

    END (BEAM AXIS WAS MISALIGNED)