Inspection steps

WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Perform all of steps to Step 9 in "How to troubleshoot" before performing this steps. (Refer to HOW TO TROUBLESHOOT )

Check DTC
1. Check the displayed DTC.
  Criteria: DTCs other than U**** are not output
NO: Perform the diagnosis according to the DTC.

YES: Go to next step
DTC check
1. Check the displayed DTC.
  Criteria: U0327 is output
NO: Go to "How to simulate trouble phenomenon" (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

YES: Go to next step
Checking CAN communication circuit
1. Check CAN communication circuit. (Refer to CHECKING CAN COMMUNICATION CIRCUIT )
  Criteria: No fault is found.
NO: Follow the repair procedure described in "CAN communication circuit check".

YES: Go to next step
DTC check
1. Use SSM4 to read DTC.
  Criteria: U0327 is output
NO: Go to "How to simulate trouble phenomenon" (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

YES: Go to next step
DTC check
1. Use SSM4 to read DTCs of all the systems.
  Criteria: U0327 is not detected from the main body ECM.
NO: Replace the collation ECM (Smart key computer ASSY).

YES: Go to next step
Replacement of the module
1. Replace the collation ECM (Smart key computer ASSY).
  NOTE: Do not register the collation ECM (Smart key computer ASSY).
2. Use SSM4 to read DTC.
  Criteria: U0327 is output
NO: System is normal. (Register the collation ECM (Smart key computer ASSY).

YES: Go to next step
Replacement of the module
1. Reinstall the collation ECM (Smart key computer ASSY).
2. Replace the module that DTC has been detected.
3. Use SSM4 to read DTC.
  Criteria: U0327 is output
NO: System is normal.

YES: Go to next step

Replace the collation ECM (Smart key computer ASSY).