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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Vehicle Stability Control System (For Vacuum Brake Booster) - Diagnostic Codes (B1380-U0074) & Symptom Tests >> VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) >> DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message [08/2019 - ] >> Description

DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message [08/2019 - ]: Description

The skid control ECU (brake actuator assembly) receives the signals from the ECM, steering sensor, and yaw rate and acceleration sensor (air bag sensor assembly) via the CAN communication system.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0074-88 Control Module Communication Bus "B" Off Bus Off Any of the following is detected:
  • A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. (Sent signals cannot be received.)
  • When the +BS terminal voltage is between 9.5 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor (air bag sensor assembly) and steering sensor continues for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds.
    • The condition that a delay in receiving data from the yaw rate and acceleration sensor (air bag sensor assembly) and steering sensor occurs more than once within 5 seconds.
 CAN communication system
U0100-87 Lost Communication With ECM/PCM "A" Missing Message When the +BS terminal voltage is between 9.5 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
  • Skid control ECU (Brake actuator assembly)
  • ECM
U0101-87 Lost Communication with TCM Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the TCM (ECM) for 2 seconds or more.
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • TCM (ECM)
U0125-87 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message Any of the following is detected:
  • When the +BS terminal voltage is between 9.5 and 17.4 V, and the vehicle speed is 7 km/h or more, data from the yaw rate and acceleration sensor (air bag sensor assembly) cannot be received for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds.
    • The condition that data from the yaw rate and acceleration sensor (air bag sensor assembly) cannot be received occurs once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Acceleration sensor (air bag sensor assembly)
U0126-87 Lost Communication with Steering Angle Sensor Module Missing Message Any of the following is detected:
  • When the +BS terminal voltage is between 9.5 and 17.4 V, data from the steering sensor cannot be received for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds.
    • The condition that data from the steering sensor cannot be received occurs once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Steering sensor
U0074-88 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition When the +BS terminal voltage is between 9.5 and 17.4 V - ◦ ◦
Malfunction Status A bus OFF state occurs once or more (Sent signals cannot be received.) ◦ - -
A delay in receiving data from the yaw rate sensor and steering sensor continues - ◦ -
The condition that a delay in receiving data from the yaw rate sensor and steering sensor occurs more than once within 5 seconds. - - ◦
Detection Time Within 0.1 seconds, 10 times in succession. 1 second or more. Occurs 10 times in succession within 60 seconds.
Number of Trips 1 trip 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

U0125-87 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition When the +BS terminal voltage is between 9.5 and 17.4 V ◦ ◦
Malfunction Status The vehicle speed is 7 km/h or more, data from the acceleration sensor cannot be received ◦ -
The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds - ◦
Detection Time 1 second or more. Occurs 10 times in succession within 60 seconds.
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

U0126-87 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition When the +BS terminal voltage is between 9.5 and 17.4 V ◦ ◦
Malfunction Status Data from the steering sensor cannot be received ◦ -
The condition that data from the steering sensor cannot be received occurs once or more within 5 seconds - ◦
Detection Time 1 second or more. Occurs 10 times in succession within 60 seconds.
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

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