Toyota Tundra Service Manual: Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

DESCRIPTION

When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis is misaligned.

C1A11 is output when it is determined that the millimeter wave radar sensor assembly beam axis is misaligned.

If sensor beam axis adjustment is not performed after installing a new millimeter wave radar sensor assembly, C1A14 is output.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A11	Front Radar Sensor Incorrect Axial Gap	When the vehicle is being driven at a speed of 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.3 seconds or more.	Millimeter wave radar sensor assembly
C1A14	Front Radar Sensor Beam Axis Not Adjusted	When the vehicle is being driven at a speed of 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, incompletion of the millimeter wave radar sensor beam axis alignment is detected for approximately 0.3 seconds or more.	Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, make sure to replace it with a new one. If a device which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle, and as a result, a DTC may be stored.
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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PROCEDURE

1.	CHECK FOR DTCs (RADAR CRUISE 2)

(a) Check if the stored DTCs are current DTCs.

(b) Connect the Techstream to the DLC3.

(d) Enter the following menus: Body Electrical / Radar Cruise 2 / Trouble Codes.

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(e) Check for DTCs.

Click here

Result	Proceed to
Current DTC C1A11 is output	A
Current DTC C1A14 is output	B
History DTC C1A11 is output	C

GO TO STEP 11

GO TO STEP 13

2.	CHECK VEHICLE CONDITION

(a) Check the operating conditions of the vehicle.

HINT:

DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is temporarily misaligned due to the vehicle being overloaded.

Result	Proceed to
Vehicle is not overloaded or being towed.	A
Vehicle is overloaded or being towed.	B

GO TO STEP 10

3.	CHECK WHEEL ALIGNMENT

(a) Check the wheel alignment (toe).

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HINT:

DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is misaligned due to incorrect wheel alignment (toe).

Result	Proceed to
Front wheel is misaligned (toe)	A
Front wheels are not misaligned (toe)	B

GO TO STEP 7

4.	ADJUST WHEEL ALIGNMENT

(a) Adjust the alignment (toe) of the wheels.

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5.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

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6.	CHECK FOR DTCs (RADAR CRUISE 2)

(a) Clear the DTCs.

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(b) Make sure that the DTC detection conditions are met.

HINT:

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

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

Click here

Result	Proceed to
DTC C1A11 is not output	A
DTC C1A11 is output	B

END

GO TO STEP 8

7.	CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Check that the bracket of the millimeter wave radar sensor assembly is not deformed.

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HINT:

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

Result	Proceed to
Bracket is not deformed	A
Bracket is deformed	B

GO TO STEP 5

8.	REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

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(b) Perform millimeter wave radar sensor assembly adjustment.

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9.	CHECK FOR DTCs (RADAR CRUISE 2)

(a) Clear the DTCs.

Click here

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

10.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Return the vehicle to normal operating conditions.

(b) Perform millimeter wave radar sensor assembly adjustment.

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END

11.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

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12.	CHECK FOR DTCs (RADAR CRUISE 2)

(a) Clear the DTCs.

Click here

(b) Make sure that the DTC detection conditions are met.

HINT:

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

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

Click here

Result	Proceed to
DTC C1A14 is not output	A
DTC C1A14 is output	B

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

GO TO STEP 8

13.	CLEAR DTC (RADAR CRUISE 2)

(a) Check for DTCs related to misalignment of millimeter wave radar sensor assembly.

HINT:

If only history DTCs are stored, they may have stored due to a temporarily condition such as overloading of the vehicle, and the system returned to normal when beam axis learning was performed.

(b) Clear the DTCs.

Click here

END

Front Radar Sensor (C1A10)

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