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

Toyota Yaris XP210 (2020-2022) 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)

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