Toyota Yaris: Active Torque Split Awd System / Lost Communication with ECM/PCM "A" Missing Message (U010087,U012687,U012987)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Drivetrain / Gf1a (transfer / 4wd / Awd) / Active Torque Split Awd System / Lost Communication with ECM/PCM "A" Missing Message (U010087,U012687,U012987)

DESCRIPTION

The AWD ECU assembly receives signals from the ECM, steering sensor and skid control ECU (brake actuator assembly) via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory
U010087	Lost Communication with ECM/PCM "A" Missing Message	When the ignition switch is ON, the IG1 terminal voltage is 10 V or more and the vehicle speed is 60 km/h (37 mph) or more, signals cannot be received from the ECM for 1 second or more	CAN communication system AWD ECU assembly ECM	Displayed	Yes
U012687	Lost Communication with Steering Angle Sensor Module Missing Message	When the following continues: When the IG1 terminal voltage is 10 V or more, communication with the steering sensor is impossible for 1 second or more When the IG1 terminal voltage is 10 V or more, a condition in which communication with the steering sensor is impossible occurs 1 time or more within a 5-second period, and this occurs 10 times within 60 seconds	CAN communication system AWD ECU assembly Steering sensor	Displayed	Yes
U012987	Lost Communication with Brake System Control Module Missing Message	When the IG1 terminal voltage is 10 V or more, communication with the skid control ECU (brake actuator assembly) is impossible for 3 seconds or more	CAN communication system AWD ECU assembly Skid control ECU (Brake actuator assembly)	Displayed	Yes

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Chassis > Four Wheel Drive > Trouble Codes

(b) Record the output DTCs.

HINT:

When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

Supply Voltage Circuit Circuit Voltage Out of Range (C123A1C)

DESCRIPTION When a malfunction has occurred in the power source circuit, the AWD ECU assembly stores DTC C123A1C. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory C123A1C Supply Voltage Circuit Circuit Voltage Out of Range At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9...

AWD Warning Light Remains ON

DESCRIPTION The AWD ECU assembly is connected to the combination meter assembly via the CAN communication system. If the AWD ECU assembly stores any DTCs which are related to the active torque split AWD system, the warning message is displayed on the multi-information display in the combination meter assembly...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Removal

REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed, installed, or replaced during the steering gear assembly removal/installation are shown below...

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration. Click here HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table...