Dtc C1A11 Front Radar Sensor Incorrect Axial Gap


DESCRIPTION

INSPECTION PROCEDURE

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

CHECK FOR DTC

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

CHECK FOR DTC

DTC C1A11 Front Radar Sensor Incorrect Axial Gap

DTC C1A14 Front Radar Sensor Beam Axis Not Adjusted


DESCRIPTION

The driving support ECU uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on this information, the driving support ECU sends pre-crash 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 yaw rate sensor, etc., the millimeter wave radar sensor assembly performs a self-diagnosis to check if the sensor beam axis is deviated from the direction that the vehicle is moving. When the beam axis of millimeter wave radar sensor assembly is deviated, the driving support ECU detects this, and stores DTC C1A11
After installing a new millimeter wave radar sensor, if the sensor beam axis adjustment is not performed, DTC C1A14 is stored.

DTC Code
DTC Detection Condition
Trouble Area
C1A11
With the ignition switch ON and the millimeter wave radar sensor assembly performing self-diagnosis, axis deviation is detected for 1 second (sensor self-diagnosis operates when the vehicle is driven at approximately 50 km/h [31 mph] for a total of 10 hours).
  1. Millimeter wave radar sensor assembly
  2. Driving support ECU
C1A14
The vehicle is driven at 10 km/h (6 mph) or more while axis adjustment of the millimeter wave radar sensor assembly has not been performed for 1 second.
  1. Millimeter wave radar sensor assembly
  2. Driving support ECU

INSPECTION PROCEDURE

1.CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

  1. Check the millimeter wave radar sensor assembly installation (LandCruiser RM000002MC201LX.html).


NEXT


2.ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

  1. Adjust the millimeter wave radar sensor assembly (LandCruiser RM000000WQG01ZX.html).


NEXT


3.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM0000043K500GX.html).

  1. Check for DTCs (LandCruiser RM0000043K500GX.html).

    OK:
    DTC C1A11 or C1A14 is not output.


NG
Go to step 4
OK

END

4.REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

  1. Replace the millimeter wave radar sensor assembly (LandCruiser RM000002MC401LX.html).


NEXT


5.ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

  1. Adjust the millimeter wave radar sensor assembly (LandCruiser RM000000WQG01ZX.html).


NEXT


6.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM0000043K500GX.html).

  1. Check for DTCs (LandCruiser RM0000043K500GX.html).

    OK:
    DTC C1A11 or C1A14 is not output.
    HINT:
    After performing the radar beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the driving support ECU.


NG
REPLACE DRIVING SUPPORT ECU (LandCruiser RM000002OJO01NX.html)
OK

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY IS DEFECTIVE)