Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B56X
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2021]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM (for HV Model): P163181; Communication Error from ECM to VSC Invalid Serial Data Received; 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]

DTC

P163181

Communication Error from ECM to VSC Invalid Serial Data Received

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.

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 hybrid vehicle control ECU continuously receives a logic error signal from the skid control ECU (brake booster with master cylinder assembly) for approximately 1 second or more.
  • CAN communication system
  • Hybrid vehicle control ECU
  • Skid control ECU (brake booster with master cylinder 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 HV [04/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the hybrid vehicle control ECU, refer to Registration.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

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

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

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

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

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2021 MY Avalon HV [08/2020 - 08/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV 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 HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU.

Click here 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: 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 BOOSTER WITH MASTER CYLINDER ASSEMBLY