Toyota Yaris: Dynamic Radar Cruise Control System / Invalid Data Received from ECM/PCM "A" Invalid Serial Data Received (U040181)

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Invalid Data Received from ECM/PCM "A" Invalid Serial Data Received (U040181)

DESCRIPTION

If the ECM cannot recognize the millimeter wave radar sensor assembly. DTC U040181 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U040181	Invalid Data Received from ECM/PCM "A" Invalid Serial Data Received	Approximately 17 seconds or more after the ignition switch is turned to ON, the ECM cannot recognize the millimeter wave radar sensor assembly for approximately 5 seconds or more.	ECM	Radar Cruise2

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the ECM, refer to Service Bulletin.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > Clear DTCs

2.	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 Cruise2 > Trouble Codes

Result	Proceed to
DTC U040181 is not output	A
DTC U040181 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE ECM

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