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 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. Start the engine.
2. Use SSM3 to read DTC detected on CAN system.
  Criteria: U0073 is not output
  
  NO: Perform the diagnosis of U0073. (Refer to DTC U0073 CAN FAILURE/A SYSTEM BUS OFF DETECTION )
  
  YES: Go to Next Step
Check DTC
1. Use SSM3 to read DTC detected on CAN system.
  Criteria: U1201 is output
  
  NO: A temporary communication error may have occurred. Clear the memory.
  
  YES: Go to Next Step
Check DTC
1. Turn the ignition switch OFF and then ON again.
2. Use SSM3 to read DTC detected on CAN system.
  Criteria: U1201 is output
  
  NO: A temporary communication error may have occurred. Clear the memory.
  
  YES: Go to Next Step
Check control module
1. Turn the ignition switch to OFF.
2. Disconnect the control modules in the proper sequence.
  NOTE: When disconnecting ECM or brake actuator assembly, connect the resistance of 120 Ωbetween CAN-Hi and CAN-Lo to substitute a termination resistor.
3. Turn the ignition switch to ON.
4. Use SSM3 to read DTC detected on CAN system.
  Criteria: U1201 is no longer output
  
  NO: Repeat Step 5 until U1201 is not detected.
  
  YES: Replace the control module which has been removed when no DTC is output.