Check Using The DTC Check Sheet

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

DTC check sheet

Bus off detection

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Data no-receive detection

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Data abnormal detection

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Authentication data detection, authentication data continuous detection, authentication data no-receive detection

Courtesy of SUBARU OF AMERICA, INC.

MODULE INSTALLATION CHECK .
1. Using the check sheet for communication for initializing, check the vehicle installation module (module targeted for CAN communication).
2. Write "-" marks in the field for installation check (A) if the vehicle to be inspected does not have relevant module.
3. Write "-" marks in all blank fields on the same row that the "-" mark has filled in.
Was the module installation check above performed?

Yes : Go to 2.

No : Perform the module installation check, Go to 2.
CHECK DTC (BUS OFF DETECTION/DATA NOT RECEIVED) .
Check the DTC. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)

NOTE:
It becomes impossible for CAN diagnostic module to read DTC, if there is a current code regarding open harness (data not received). If this occurs, perform the "Check using the check sheet of communication for initializing" Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION>INSPECTION>CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING , and use this check sheet to confirm that the corresponding part becomes the history code.

Is DTC bus off or data not received?

Yes : Go to 3.

No : Perform the diagnosis for the displayed DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST
CHECK DTC (BUS OFF DETECTION/DATA NOT RECEIVED) .
Mark "X" in the field corresponding to the DTCs that has been detected by each module in the DTC check sheet.

Were all the corresponding fields in the DTC check sheet filled?

Yes : Go to 4.

No : Fill all the corresponding fields in the DTC check sheet, Go to 4.
CHECK CAN COMMUNICATION LINE .
Check the CAN communication line by referring to the example of DTC data not received. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN COMMUNICATION CIRCUIT CHECK

Is CAN communication line faulty?

Yes : Repair or replace the faulty portion of the harness.

No : Perform the diagnosis for the displayed DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST