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Home >> Subaru >> 2014 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle (Diagnostics) >> Automatic Transmission System >> DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) 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
U0100
  1. CAN bus is normal.
  2. Signals from ECM No CAN are lost.
  3. 500 ms, 800 ms, 2000 ms (differ depending on ID)
  4. 1 trips
  • CAN system
U0122
  1. CAN bus is normal.
  2. Signals from skid control computer (brake actuator ASSY) are lost.
  3. 800 ms
  4. 1 trips
  • CAN system
U0140
  1. CAN bus is normal.
  2. Signals from main body ECM (multiplex network body computer) are lost.
  3. 800 ms, 20000 ms (differ depending on ID)
  4. 1 trips
  • CAN system
U0155
  1. CAN bus is normal.
  2. Signals from combination meter ASSY are lost.
  3. 2000 ms
  4. 1 trips
  • CAN system
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