Toyota 4Runner manuals

Toyota 4Runner: Control Module Communication Bus OFF (U0073,U0100,U0114,U0123,U0124,U0126)

DESCRIPTION

DTC Code

DTC Detection Conditions

Trouble Area

U0073

One of the following conditions is met:

  • 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.
  • The condition that bus OFF state occurs once or more within 0.1 seconds occurs 10 times in succession (Sent signals cannot be received).
  • 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.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    • 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:

  • When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed 15 km/h (9 mph) or more, data cannot be sent to the ECM for 2 seconds or more.
  • When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed 15 km/h (9 mph) or more, data cannot be received to the ECM for 2 seconds or more.

U0114

The CAN signal from the four wheel drive control ECU is lost or malfunctioning for 1.2 seconds.

U0123

Either condition is met:

  • 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.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    • The condition that data from the yaw rate sensor cannot be received occurs once or more within 5 seconds.

U0124

Either condition is met:

  • 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.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    • The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.

U0126

One of the following conditions is met:

  • 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.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
  • The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.

PROCEDURE

1.

RECONFIRM DTC

(a) Clear the DTCs (See page ).


(b) Check if the same DTCs are output (See page ).


Result

Result

Proceed to

DTC is output

A

DTC is not output

B


A

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)


B

USE SIMULATION METHOD TO CHECK

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