Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Communication Error from VSC to ECM Invalid Serial Data Received (P163081)

DESCRIPTION

The skid control ECU (brake actuator assembly) sends signals such as cruise control cancel signals and brake demand response signals to the ECM when the dynamic radar cruise control system is operating.

CAUTION / NOTICE / HINT

NOTICE:

• First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

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• Before replacing the ECM, refer to Registration.

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• After the skid control ECU (brake actuator assembly) is replaced, perform the yaw rate sensor and G sensor zero point calibration and store the system information.

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PROCEDURE

(a) Using the Techstream, check if the CAN communication system is functioning normally.

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NG

GO TO CAN COMMUNICATION SYSTEM

OK

(a) Clear the DTCs.

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

HINT:

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

(c) Check for DTCs.

A

USE SIMULATION METHOD TO CHECK

B

(a) Replace the brake actuator assembly.

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NEXT

(a) Clear the DTCs.

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

HINT:

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

(c) Check for DTCs.

A

END

B

REPLACE ECM