Inspection steps

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Perform this procedure after performing until STEP 9 in "How to troubleshoot". (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
Check DTC
1. Check the displayed DTC.
  Criteria: U0100 is output
  
  NO: Go to "How to simulate trouble phenomenon" (Refer to PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION )
  
  YES: Go to Next Step
Check CAN communication circuit
1. Check CAN communication circuit. (Refer to CHECK CAN COMMUNICATION CIRCUIT )
  Criteria: No fault is found.
  
  NO: Follow the repair procedure described in "CAN communication circuit check".
  
  YES: Go to Next Step
Check DTC
1. Use SSM3 to read DTC.
  Criteria: U0100 is output
  
  NO: Go to "How to simulate trouble phenomenon" (Refer to PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION )
  
  YES: Go to Next Step
Check DTC
1. Use SSM3 to read DTCs of all the systems.
  Criteria: U0100 is not detected from more than one module
  
  NO: Replace the ECM.
  
  YES: Go to Next Step
Replace the module
1. Replace the engine control computer.
2. Use SSM3 to read DTC.
  Criteria: U0100 is output
  
  NO: System is normal.
  
  YES: Go to Next Step
Replace the module
1. Reinstall the engine control computer.
2. Replace the module that DTC has been detected.
3. Use SSM3 to read DTC.
  Criteria: U0100 is output
  
  NO: System is normal.
  
  YES: Replace the ECM.