Toyota Tundra Service Manual: Control Module Communication Bus OFF (U0073,U0100,U0114,U0123,U0126)

Toyota Tundra Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Control Module Communication Bus OFF (U0073,U0100,U0114,U0123,U0126)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor (spiral with sensor cable sub-assembly), yaw rate and acceleration sensor (airbag sensor assembly) and 4WD control ECU via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0073

Control Module Communication Bus OFF

The +BS terminal voltage is between 9.6 and a 16.5 V and a bus OFF state occurs for 0.8 seconds or more.

CAN communication system

U0100

Lost Communication with ECM / PCM

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals cannot be sent to the ECM for 1 second or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM

U0114

Lost Communication with 4WD Control ECU

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the 4WD control ECU cannot be received for 1 second or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • 4WD control ECU

U0123

Lost Communication with Yaw Rate Sensor Module

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the yaw rate and acceleration sensor cannot be received for 1 second or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Yaw rate and acceleration sensor (airbag sensor assembly)

U0126

Lost Communication with Steering Angle Sensor Module

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the steering angle sensor cannot be received for 1 second or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Steering angle sensor (spiral with sensor cable sub-assembly)

PROCEDURE

1.

CHECK DTC OUTPUT (HEALTH CHECK)

(a) Clear the DTCs.

Click here

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Enter the following menus: System Select / Health Check.

(e) Check for DTCs.

Result

Proceed to

DTCs for related systems are output together with DTC U0073, U0100, U0114, U0123 or U0126.

A

U0073, U0100, U0114, U0123 or U0126 is output

B

DTCs are not output

C

A

GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM)

B

INSPECT CAN COMMUNICATION SYSTEM

C

USE SIMULATION METHOD TO CHECK

    Test Mode Procedure

    Vehicle Control History

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