Dtc U0073 Control Module Communication Bus Off


DESCRIPTION

INSPECTION PROCEDURE

RECONFIRM DTC

DTC U0073 Control Module Communication Bus OFF

DTC U0100 Lost Communication with ECM / PCM

DTC U0114 Lost Communication with 4WD Control ECU

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


DESCRIPTION

The skid control ECU receives signals from the ECM, the steering angle sensor and the yaw rate and acceleration sensor via the CAN communication system.

DTC Code
DTC Detection Condition
Trouble Area
U0073
One of the following conditions is met:
  1. When the IG1 terminal voltage is between 10 and 17.4 V, after the output of data from the skid control ECU is completed, the sending operation continues for 5 seconds or more.
  2. The condition that the bus OFF state occurs once or more within 0.1 seconds occurs 10 times in succession (sent signals cannot be received).
  3. When the IG1 terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more.
  4. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    1. The condition that a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs more than once within 5 seconds.
CAN communication system
U0100
Either condition is met:
  1. When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to the ECM for 2 seconds or more.
  2. When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 15 km/h (9 mph) or more, data cannot be received from the ECM for 2 seconds or more.
CAN communication system
U0114
The CAN signal from the four wheel drive control ECU is lost or malfunctioning for 1.2 seconds.
CAN communication system
U0123
Either condition is met:
  1. When the IG1 terminal voltage is between 10 and 17.4 V, data from the yaw rate sensor cannot be received for 1 second or more.
  2. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    1. The condition that data from the yaw rate sensor cannot be received occurs once or more within 5 seconds.
CAN communication system
U0124
Either condition is met:
  1. When the IG1 terminal voltage is between 10 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more.
  2. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    1. The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.
CAN communication system
U0126
Either condition is met:
  1. When the IG1 terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.
  2. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    1. The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.
CAN communication system

INSPECTION PROCEDURE

1.RECONFIRM DTC

  1. Check for DTCs (LandCruiser RM000000XHV0KEX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		for LHD without Entry and Start System
    		B
    DTC output
    		for LHD with Entry and Start System
    		C



B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0BYX.html)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0C5X.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)