Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001PYSA
Model Year Start: 2021 Model: Avalon Prod Date Range: [08/2020 - 08/2021]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM (for Gasoline Model): P163181; Communication Error from ECM to VSC Invalid Serial Data Received; 2021 MY Avalon [08/2020 - 08/2021]

DTC

P163181

Communication Error from ECM to VSC Invalid Serial Data Received

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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

P163181

Communication Error from ECM to VSC Invalid Serial Data Received

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, the ECM continuously receives a logic error signal from the skid control ECU (brake actuator assembly) for approximately 1 second or more.
  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

Does not come on

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.

    Click here 2019 - 2022 MY Avalon [04/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the ECM, refer to Registration.

    Click here 2021 - 2022 MY Avalon [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • 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.

    Click here 2019 - 2021 MY Avalon [04/2018 - 08/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): CALIBRATION

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

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

Click here 2021 MY Avalon [08/2020 - 08/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

Result

Proceed to

CAN communication system DTCs are not output

OK

CAN communication system DTCs are output

NG
NG

GO TO CAN COMMUNICATION SYSTEM

OK

2.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise1 > Clear 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.

Powertrain > Radar Cruise1 > Trouble Codes

Result

Proceed to

DTC P163181 is not output

A

DTC P163181 is output

B
A

USE SIMULATION METHOD TO CHECK

B

3.

REPLACE ECM

(a) Replace the ECM.

for 2GR-FKS: Click here 2019 - 2021 MY Avalon [04/2018 - 08/2021]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

for A25A-FKS: Click here 2021 - 2022 MY Avalon [08/2020 -        ]; A25A-FKS (ENGINE CONTROL): ECM: REMOVAL

NEXT

4.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise1 > Clear 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.

Powertrain > Radar Cruise1 > Trouble Codes

Result

Proceed to

DTC P163181 is not output

A

DTC P163181 is output

B
A

END
B

REPLACE BRAKE ACTUATOR ASSEMBLY