Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Communication Error from ECM to VSC Invalid Serial Data Received (P163181)

DESCRIPTION

The ECM sends signals such as dynamic radar cruise control operation signals, brake operation demand signals and buzzer operation demand signals to the skid control ECU (brake actuator assembly) when the dynamic radar cruise control is operating. Therefore, if the skid control ECU (brake actuator assembly) detects a communication error with the ECM, it sends a malfunction signal back to the ECM.

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 ECM.

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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 BRAKE ACTUATOR ASSEMBLY