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Home >> Lexus >> 2017 >> IS 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Four Wheel Drive Control System - Diagnostic Codes & Symptom Tests >> Four Wheel Drive Control System >> DTC U0073-86: Control Module Communication Bus OFF; DTC U0100-85: Lost Communication with ECM / PCM "A"; DTC U0126-84: Lost Communication with Steering Angle Sensor Module; DTC U0129-83: Lost Communication with Brake System Control Module [04/2013 - 09/2020] >> Description
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DTC U0073-86: Control Module Communication Bus OFF; DTC U0100-85: Lost Communication with ECM / PCM "A"; DTC U0126-84: Lost Communication with Steering Angle Sensor Module; DTC U0129-83: Lost Communication with Brake System Control Module [04/2013 - 09/2020]: Description

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
U0073/86 Control Module Communication Bus OFF
  1. When the following condition continues for 5 seconds or more:
    • Signals from the 4WD ECU assembly are not received.
  2. When the following condition occurs 10 times consecutively:
    • A communication malfunction (bus off) occurs one or more times within 0.1 seconds.
  • Wire harness (CANL, CANH circuit)
  • 4WD ECU assembly
 Comes on DTC stored
U0100/85 Lost Communication with ECM / PCM "A"
  1. When both of the following conditions continue for 2 seconds or more:
    • The voltage at terminal IG1 is 10 V or more.
    • At a vehicle speed of 60 km/h (38 mph) or more, communication with the ECM cannot be performed.
  • Wire harness (CANL, CANH circuit)
  • 4WD ECU assembly
  • ECM
 Does not come on DTC stored
U0126/84 Lost Communication with Steering Angle Sensor Module
  1. When both of the following conditions continue for 1 second or more:
    • The voltage of the IG1 terminal is 10 V or more.
    • Communication with the steering sensor cannot be performed.
  2. When both of the following conditions occur 10 times consecutively:
    • The voltage at terminal IG1 is 10 V or more.
    • The condition that communication with the steering sensor cannot be performed occurs once within 5 seconds.
  • Wire harness (CANL, CANH circuit)
  • 4WD ECU assembly
  • Steering sensor
 Does not come on DTC stored
U0129/83 Lost Communication with Brake System Control Module
  1. When both of the following conditions continue for 3 seconds or more:
    • The voltage at terminal IG1 is 10 V or more.
    • Communication with the skid control ECU (brake actuator assembly) cannot be performed.
  • Wire harness (CANL, CANH circuit)
  • 4WD ECU assembly
  • Skid control ECU (brake actuator assembly)
 Comes on DTC stored
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