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Home >> Toyota >> 2016 >> Prius Two >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System - Diagnostic Codes (5 Of 5) & Symptom Tests >> Electronically Controlled Brake System >> DTC U0073: Control Module Communication Bus Off; DTC U0110: Lost Communication with Drive Motor Control Module "A"; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System [11/2015 - 12/2018] >> Description
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DTC U0073: Control Module Communication Bus Off; DTC U0110: Lost Communication with Drive Motor Control Module "A"; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System [11/2015 - 12/2018]: Description

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

The skid control ECU (brake booster with master cylinder assembly) receives signals from the hybrid vehicle control ECU, steering angle sensor, certification ECU (smart key ECU assembly), inverter with converter assembly and yaw rate and acceleration sensor (airbag ECU assembly) via CAN communication.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
U0073 Control Module Communication Bus Off 461
462
463
  • INF Code: 461
    • Either of the following is detected:
      1. Yaw rate and acceleration sensor communication is disabled for 1 second or more.
      2. Yaw rate and acceleration sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • INF Code: 462
    • Either of the following is detected:
      1. Steering angle sensor communication is disabled for 1 second or more.
      2. Steering angle sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • INF Code: 463
    • Bus off occurs once or more per 0.1 seconds 10 times repeatedly.
  • INF Code: 461
    • CAN communication line
    • Yaw rate and acceleration sensor (airbag ECU assembly)
    • Skid control ECU (brake booster with master cylinder assembly)
  • INF Code: 462
    • CAN communication line
    • Steering angle sensor
    • Skid control ECU (brake booster with master cylinder assembly)
  • INF Code: 463
    • CAN communication line
    • Skid control ECU (brake booster with master cylinder assembly)
 Electronically controlled brake system DTC
U0110 Lost Communication with Drive Motor Control Module "A" 1153
1154
  • INF Code: 1153
    • When terminal IG2 voltage is 9.5 V or more, data from the inverter with converter assembly cannot be received for 2 seconds or more.
  • INF Code: 1154
    • When terminal IG2 voltage is 9.5 V or more, the condition in which data from the inverter with converter assembly cannot be received once or more within 5 seconds occurs 10 times in succession.
  • CAN communication line
  • Inverter with converter assembly
  • Skid control ECU (brake booster with master cylinder assembly)
 Electronically controlled brake system DTC
U0120 Lost Communication With Starter / Generator Control Module 1158 Push start switch data is invalid for 3 seconds or more.
  • CAN communication line
  • Certification ECU (smart key ECU assembly)
  • Skid control ECU (brake booster with master cylinder assembly)
 Electronically controlled brake system DTC
U0124 Lost Communication With Lateral Acceleration Sensor Module 591
592
  • INF Code: 591
    • Acceleration sensor communication is disabled for 1 second or more.
  • INF Code: 592
    • Acceleration sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • CAN communication line
  • Acceleration sensor (airbag ECU assembly)
  • Skid control ECU (brake booster with master cylinder assembly)
 ABS DTC
U0126 Lost Communication With Steering Angle Sensor Module 741
742
  • INF Code: 741
    • Steering angle sensor communication is disabled for 1 second or more.
  • INF Code: 742
    • Steering angle sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • CAN communication line
  • Steering angle sensor
  • Skid control ECU (brake booster with master cylinder assembly)
 VSC DTC
U0293 Lost Communication with Hybrid Vehicle Control System 411
412
413
  • INF Code: 411, 413
    • When terminal IG2 voltage is 9.5 V or more, data from the hybrid vehicle control ECU cannot be received for 2 seconds or more.
  • INF Code: 412
    • When terminal IG2 voltage is 9.5 V or more, the condition in which data from the hybrid vehicle control ECU cannot be received once or more within 5 seconds occurs 10 times in succession.
  • CAN communication line
  • Hybrid vehicle control ECU
  • Skid control ECU (brake booster with master cylinder assembly)
 Electronically controlled brake system DTC
DTC DETECTION CONDITIONS: U0073 INF CODE: 461

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status Yaw rate and acceleration sensor communication is disabled. ◦ -
Communication with the yaw rate and acceleration sensor is invalid once or more within 5 seconds. - ◦
Detection Time 1 second or more Occurs 10 times or more within 60 seconds
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

DTC DETECTION CONDITIONS: U0073 INF CODE: 462

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status Steering angle sensor communication is disabled. ◦ -
Communication with the steering angle sensor is invalid once or more within 5 seconds. - ◦
Detection Time 1 second or more Occurs 10 times or more within 60 seconds
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

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