Dtc U0073/86 Control Module Communication Bus Off

Drive Line. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Differential. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTC

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


DESCRIPTION

  1. The 4WD control ECU inputs the signals sent from the ECM, skid control ECU, and steering angle sensor via the CAN communication system.
  1. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

DTC No.
DTC Detection Condition
Trouble Area
U0073/86
  1. When the following continues for 5 seconds or more:
    1. Signals from the 4WD control ECU are not received.
  2. When the following occurs 10 times consecutively:
    1. A communication malfunction (bus off) occurs one or more times within 0.1 second.
  1. Wire harness (CANL, CANH circuit)
  1. 4WD control ECU
U0100/85
  1. When both of the following continue for 2 seconds or more:
    1. The voltage of the IG1 terminal is 10 V or more.
    1. At a vehicle speed of 60 km/h (38 mph) or more, communication with the ECM cannot be performed.
  1. Wire harness (CANL, CANH circuit)
  1. 4WD control ECU
  1. ECM
U0126/84
  1. When both of the following continue for 1 second or more:
    1. The voltage of the IG1 terminal is 10 V or more.
    1. Communication with the steering angle sensor cannot be performed.
  2. When all of the following occur 10 times consecutively:
    1. The voltage of the IG1 terminal is 10 V or more.
    1. The condition that communication with the steering angle sensor cannot be performed occurs once within 5 seconds.
    1. Occurs 10 times or more within 60 seconds.
  1. Wire harness (CANL, CANH circuit)
  1. 4WD control ECU
  1. Steering angle sensor
U0129/83
  1. When the following continues for 3 seconds or more:
    1. The voltage of the IG1 terminal is 10 V or more.
    1. Communication with the skid control ECU cannot be performed.
  1. Wire harness (CANL, CANH circuit)
  1. 4WD control ECU
  1. Skid control ECU

INSPECTION PROCEDURE

1.CHECK FOR DTC
  1. Check for DTC (RAV4_ACA30 RM0000020BA00FX.html).

  1. Record the output DTC (4WD control system).

HINT:
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

NEXT

GO TO CAN COMMUNICATION SYSTEM