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Home >> Lexus >> 2017 >> NX 300h >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes (3 Of 3) & Circuit Tests >> Electronically Controlled Brake System >> DTC U0073: Control Module Communication Bus OFF; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0128: Lost Communication With EPB Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [05/2019 - ] >> Description
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DTC U0073: Control Module Communication Bus OFF; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0128: Lost Communication With EPB Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [05/2019 - ]: Description

The skid control ECU (brake booster with master cylinder assembly) receives signals from the hybrid vehicle control ECU, steering sensor, parking brake ECU assembly, certification ECU (smart key ECU 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
464
465
466
  • 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 sensor communication is disabled for 1 second or more.
      2. Steering sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • INF Code: 463, 464
    • Bus off occurs once or more per 0.1 seconds 10 times repeatedly.
  • INF Code: 465, 466
    • Sending does not complete within 5 seconds after data is output from the skid control ECU (brake booster with master cylinder assembly).
  • INF Code: 461
    • CAN communication line (V bus)
    • Yaw rate and acceleration sensor (Airbag ECU assembly)
    • Skid control ECU (Brake booster with master cylinder assembly)
  • INF Code: 462
    • CAN communication line (V bus)
    • Steering sensor
    • Skid control ECU (Brake booster with master cylinder assembly)
  • INF Code: 463, 464, 465, 466
    • CAN communication line
    • Skid control ECU (Brake booster with master cylinder assembly)
 -
U0120 Lost Communication With Starter / Generator Control Module 471 Push start switch data is invalid for 3 seconds or more.
  • CAN communication line (V bus)
  • Certification ECU (Smart key ECU assembly)
  • Skid control ECU (Brake booster with master cylinder assembly)
 -
U0123 Lost Communication With Yaw Rate Sensor Module 731
732
  • INF Code: 731
    • Yaw rate sensor communication is disabled for 1 second or more.
  • INF Code: 732
    • Yaw rate sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • CAN communication line (V bus)
  • Yaw rate sensor (Airbag ECU assembly)
  • Skid control ECU (Brake booster with master cylinder assembly)
 -
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 per 5 seconds 10 times or more within 60 seconds.
  • CAN communication line (V bus)
  • Acceleration sensor (Airbag ECU assembly)
  • Skid control ECU (Brake booster with master cylinder assembly)
 -
U0126 Lost Communication With Steering Angle Sensor Module 741
742
  • INF Code: 741
    • Steering sensor communication is disabled for 1 second or more.
  • INF Code: 742
    • Steering sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • CAN communication line (V bus)
  • Steering sensor
  • Skid control ECU (Brake booster with master cylinder assembly)
 -
U0128 Lost Communication With EPB Module 425 With terminal IG1 voltage at 10 V or more, data cannot be received from the electric parking brake ECU for 1 second.
  • CAN communication line (V bus)
  • Parking brake ECU assembly
  • Skid control ECU (Brake booster with master cylinder assembly)
 EPB: Electric parking brake system
U0293 Lost Communication With Hybrid Vehicle Control System 411
412
413		 Either of the following is detected:
  1. 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.
  2. When terminal IG2 voltage is 9.5 V or more, data from the hybrid vehicle control ECU cannot be received once or more within 5 seconds occur 10 times in succession.
  • CAN communication line (V bus)
  • Hybrid vehicle control ECU
  • Skid control ECU (Brake booster with master cylinder assembly)
 -
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