Toyota Tacoma (2015-2018) Service Manual: Front Radar Sensor Incorrect Axial Gap (C1A11)

Toyota Tacoma (2015-2018) Service Manual / Pre-collision / Pre-collision System / Front Radar Sensor Incorrect Axial Gap (C1A11)

DESCRIPTION

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 self diagnosis to check if the sensor beam axis has deviated. If the millimeter wave radar sensor assembly beam axis has deviated, the millimeter wave radar sensor assembly detects this and stores DTC C1A11.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A11	Front Radar Sensor Incorrect Axial Gap	When the ignition switch is ON, misalignment of the millimeter wave radar sensor assembly is detected for approximately 1 second or more.	Millimeter wave radar sensor assembly Wheel alignment

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly 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. As a result, a DTC may be stored.
If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.
Click here

PROCEDURE

1.	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 has not been towed	A
Vehicle is overloaded or has been towed	B

GO TO STEP 9

2.	CHECK WHEEL ALIGNMENT

(a) Check the wheel alignment (toe).

Click here HINT:

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
Wheel is misaligned (toe)	A
Wheels are not misaligned (toe)	B

GO TO STEP 6

3.	ADJUST WHEEL ALIGNMENT

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

Click here

4.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

Click here

5.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

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

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

HINT:

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

Click here

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

END

GO TO STEP 7

6.	INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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

HINT:

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

OK:

The bracket is not deformed.

GO TO STEP 4

GO TO STEP 7

7.	REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

Click here (b) Adjust the millimeter wave radar sensor assembly.

(b) Adjust the millimeter wave radar sensor assembly.

Click here

8.	CLEAR DTC (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

END

9.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Return the vehicle to normal.

(b) Perform millimeter wave radar sensor assembly adjustment.

Click here

10.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

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

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

HINT:

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

Click here

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

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS MISALIGNED DUE TO THE VEHICLE BEING OVERLOADED OR TOWED)

11.	CHECK WHEEL ALIGNMENT

(a) Check the wheel alignment (toe).

Click here HINT:

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
Wheel is misaligned (toe)	A
Wheels are not misaligned (toe)	B

GO TO STEP 3

GO TO STEP 7

Steering Angle Sensor (C1A47)

DESCRIPTION The millimeter wave radar sensor assembly receives steering angle information from the steering angle sensor (spiral cable with sensor sub-assembly). If the millimeter wave radar sens ...

Front Radar Sensor Beam Axis Not Adjusted (C1A14)

DESCRIPTION After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment has not been performed, DTC C1A14 will be stored. DTC No. Detection I ...

Other materials:

Blind Spot Monitor Master Module Beam Axis Inspection Incomplete (C1ABB)
DESCRIPTION This DTC is stored when a beam axis inspection has not been performed for the blind spot monitor sensor LH. HINT: This DTC is always stored after replacing a blind spot monitor sensor. The purpose of this DTC is to ensure that beam axis inspection is performed. Completing the be ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. DTC CHECK / CLEAR (when Using Techstream) (a) Check for DTCs. (1) Connect the Techstream to the DLC3. (2) Turn the ignition switch to ON. (3) Turn the Techstream on. (4) Enter the following menus: Chassis / ABS/VSC/ TRAC / Trouble Codes. (5) Read the DTCs by following the ...

Steering Pad Switch Circuit
DESCRIPTION This circuit sends an operation signal from the steering pad switch assembly to the radio and display receiver assembly. If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly. If there is a short in the circuit, the same con ...