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.

NEXT

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

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    Other information:

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    Categories

    Turning the Engine Off

    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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