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

Toyota Yaris XP210 (2020-2025) 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

1.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > Clear DTCs
NEXT

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
A

USE SIMULATION METHOD TO CHECK

B

REPLACE ECM

    Software Incompatibility with Body Control Module Invalid/Incompatible Software Component (U032257)

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    Categories

    Turning the Engine Off

    Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.

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