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Home › Subaru › 2014 › BRZ Limited, Automatic Trans › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transaxle (Diagnostics) › Automatic Transmission System › DTC U0073 Control Module Communication Bus "A" Off; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0416 Invalid Data Received From Vehicle Dynamics Control Module; DTC U0422 Invalid Data Received From Body Control Module; DTC U0423 Invalid Data Received From Instrument Panel Cluster Control Module › Circuit description › Notes

Circuit description: Notes

The transmission control computer ASSY sends/receives signals to/from ECMs via CAN communication.

NOTE:
  • Problems on the CAN bus (communication line) can be checked from the DLC3 connector. (Except when a DLC3 branch line is disconnected.)
  • Diagnostic codes related to CAN communication can be checked using SSM3.
  • Although DLC3 is connected to the CAN communication line, CAN communication cannot detect problems on the DLC3 branch lines.
DTC No. SAE/TCCS DTC detecting condition
  1. Diagnosis condition
  2. Abnormal status
  3. Abnormal period
  4. Others
 Inspection parts
U0073
  1. IG voltage remains at 9 V or larger for 1 second or more.
  2. Data cannot be sent/received.
  3. 500 ms
  4. 1 trips
  • CAN system
U0401
  1. CAN bus is normal.
  2. Abnormal signal from engine control computer is received.
  3. 50 time
  4. 1 trips
  • CAN system
U0416
  1. CAN bus is normal.
  2. Abnormal signal from skid control computer (brake actuator ASSY) is received.
  3. 40 time
  4. 1 trips
  • CAN system
U0422
  1. CAN bus is normal.
  2. Abnormal signal from main body ECM (multiplex network body computer) is received.
  3. 40 time
  4. 1 trips
  • CAN system
U0423
  1. CAN bus is normal.
  2. Abnormal signal from combination meter ASSY is received.
  3. 40 time
  4. 1 trips
  • CAN system
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