Toyota Tundra Service Manual: Vehicle Speed Sensor Circuit (C1AA3)

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Forward Recognition Camera System / Vehicle Speed Sensor Circuit (C1AA3)

DESCRIPTION

The forward recognition camera receives vehicle speed signals from the skid control ECU (brake actuator assembly). If the skid control ECU (brake actuator assembly) receives a vehicle speed sensor malfunction signal, it informs the forward recognition camera via CAN communication, and DTC C1AA3 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1AA3	Vehicle Speed Sensor Circuit	3 seconds after the ignition switch is turned to ON, a signal from the skid control ECU (brake actuator assembly) indicating a malfunction in a vehicle speed sensor is detected by the forward recognition camera for 5 seconds or more.	Vehicle stability control system Skid control ECU (brake actuator assembly) Forward recognition camera

CAUTION / NOTICE / HINT

NOTICE:

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Axis Adjustment.
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The forward recognition camera system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
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PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

If DTC C1AA3 is stored, the vehicle stability control system may be malfunctioning. Check for DTCs related to the vehicle stability control system first.

(a) Check for DTCs.

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Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output	B

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

(a) Clear the DTCs.

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

HINT:

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

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Result	Proceed to
DTC C1AA3 is not output	A
DTC C1AA3 is output	B

USE SIMULATION METHOD TO CHECK

3.	REPLACE FORWARD RECOGNITION CAMERA

(a) Replace the forward recognition camera.

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(b) Perform forward recognition camera axis adjustment.

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4.	CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

(a) Clear the DTCs.

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

HINT:

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

Click here

Result	Proceed to
DTC C1AA3 is not output	A
DTC C1AA3 is output	B

END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Vehicle Speed Tolerance Malfunction (C1AA2)

Yaw Rate Sensor Circuit (C1AA4,C1AA5)

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