Toyota Tundra Service Manual: 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.

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

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

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

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

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(e) Check for DTCs.

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B

GO TO STEP 11

C

GO TO STEP 13

A

(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.

B

GO TO STEP 10

A

(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).

B

GO TO STEP 7

A

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

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NEXT

(a) Perform millimeter wave radar sensor assembly adjustment.

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NEXT

(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.

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

(c) Check for DTCs.

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A

END

B

GO TO STEP 8

(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.

A

GO TO STEP 5

B

(a) Replace the millimeter wave radar sensor assembly.

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(b) Perform millimeter wave radar sensor assembly adjustment.

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NEXT

(a) Clear the DTCs.

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NEXT

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

(a) Return the vehicle to normal operating conditions.

(b) Perform millimeter wave radar sensor assembly adjustment.

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(c) Clear the DTCs.

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NEXT

END

(a) Perform millimeter wave radar sensor assembly adjustment.

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NEXT

(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.

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

(c) Check for DTCs.

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A

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

B

GO TO STEP 8

(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.

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NEXT

END