Toyota Yaris: 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
(a) Clear the DTCs.
Powertrain > Radar Cruise2 > Clear DTCs
NEXT |
| |
(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 |
DESCRIPTION The millimeter wave radar sensor assembly receives vehicle specification information from the main body ECU (multiplex network body ECU) and ECM via the CAN communication line...
DESCRIPTION
The steering pad switch assembly outputs the dynamic cruise control on/off signal and various control signals to the ECM.
The ECM controls the dynamic cruise control system according to the signals received from the steering pad switch assembly...
Other information:
PRECAUTION PRECAUTION FOR SEMICONDUCTOR POWER INTEGRATION ECU (a) Do not remove or install the semiconductor power integration ECU and power distribution box assembly with the negative (-) auxiliary battery terminal connected. NOTICE:
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal...
CAUTION / NOTICE / HINT HINT:
Replace parts related to the wireless door lock control system and smart key system according to the inspection procedure.
If the wireless door lock control system and smart key system do not operate, check the customize settings and make sure that the wireless door lock control system and smart key system are not disabled...
Categories
Stop the vehicle completely.
Manual transaxle:
Shift into neutral and set the parking brake.
Automatic transaxle:
Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is
off.
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