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Home >> Subaru >> 2018 >> 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 >> Description of functions >> Test drive
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Test drive

Perform test drive to check if the DTC recurs.

  1. Connect the SSM4 to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn on the SSM4.
  4. Follow the SSM4 on-screen instructions to clear the DTCs. (Refer to CHECKING/CLEARING DTC )
  5. Turn the ignition switch to OFF, and wait for 30 seconds.
  6. Turn the ignition switch to ON.
  7. Turn on the SSM4.
  8. Start the engine.
    NOTE: If the engine cannot be started, crank the engine for 10 seconds or more.
  9. Idle the engine for 20 seconds or more.
  10. Follow the SSM4 on-screen instructions to check the DTC. (Refer to CHECKING/CLEARING DTC )