Toyota Yaris: Dynamic Radar Cruise Control System / Communication Error from ECM to VSC Invalid Serial Data Received (P163181)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Communication Error from ECM to VSC Invalid Serial Data Received (P163181)

DESCRIPTION

The skid control ECU (brake actuator assembly) sends signals such as brake request signals to the ECM. When the ECM detects logic error signals sent from the skid control ECU (brake actuator assembly) for a certain period of time, DTC P163181 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
P163181	Communication Error from ECM to VSC Invalid Serial Data Received	When the ignition switch is ON and the dynamic radar cruise control system is operating, the ECM detects logic error signals sent from the skid control ECU (brake actuator assembly) for approximately 1 second or more.	Vehicle stability control system ECM	Radar Cruise1

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the ECM, refer to Service Bulletin.

PROCEDURE

1.	CHECK FOR DTCs

(a) Check for vehicle stability control system DTCs.

Chassis > Brake > Trouble Codes

Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output	B

GO TO VEHICLE STABILITY CONTROL SYSTEM

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Radar Cruise1 > Clear DTCs

3.	CHECK FOR DTCs

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

HINT:

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

(b) Check for DTCs.

Powertrain > Radar Cruise1 > Trouble Codes

Result	Proceed to
DTC P163181 is not output	A
DTC P163181 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE ECM

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