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

DESCRIPTION

The hybrid vehicle control ECU 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 booster with master cylinder assembly) when the dynamic radar cruise control is operating. Therefore, if the skid control ECU (brake booster with master cylinder assembly) detects a communication error with the hybrid vehicle control ECU, it sends a malfunction signal back to the hybrid vehicle control ECU.

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 hybrid vehicle control ECU, refer to Registration.

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• After the skid control ECU (brake booster with master cylinder assembly) is replaced, perform the yaw rate and acceleration sensor zero point calibration.

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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 hybrid vehicle control ECU.

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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 BOOSTER WITH MASTER CYLINDER ASSEMBLY