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Home >> Subaru >> 2017 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (3 Of 3) >> EFI system (FA20) >> DTC U0073 Control Module Communication Bus "A" Off; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0402 Invalid Data Received From TCM; DTC U0416 Invalid Data Received From Vehicle Dynamics Control Module; DTC U0423 Invalid Data Received From Instrument Panel Cluster Control Module >> Inspection steps
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Inspection steps

Go to troubleshooting for CAN communication system. (Refer to How to troubleshoot )

NOTE:
  • Read the freeze frame data using the SSM4. A part of engine running conditions under which the engine trouble occurred is recorded in the freeze frame data, which is useful for trouble shooting.
  • When CAN communication system error occurs, the engine control computer cannot receive the updated information from each controller. Therefore, check of the freeze frame data corresponding to the DTCs related to the controllers is no longer useful for troubleshooting.
  • When the diagnostic codes for CAN communication error and the corresponding sensor error are both output simultaneously, the CAN communication error must be restored before troubleshooting the error codes for the sensors.
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