FUSO 4M4 – HYBRID ELECTRIC VEHICLE SYSTEM – TROUBLESHOOTING – Inspections Based on Diagnosis Codes

3.1 Diagnosis code list
โ€ข Diagnosis codes shown by the Multi-Use Tester and those indicated by flashing of the warning lamp are different.
โ€ข Diagnosis codes for the battery electronic control unit (except minor faults (codes with or)) are sent to the meter cluster via the motor electronic control unit. These codes are checked with diagnosis switch operation of the motor electronic control unit or Multi-Use Tester.
โ€ข Some diagnosis codes (minor faults (codes with or )) do not cause the warning lamp to illuminate when they occurs. In addition, they cannot be checked with the diagnosis switch operation of the motor electronic control unit. Use Multi-Use Tester to check them.
โ€ข Some diagnosis codes (codes with) detect minor changes in condition. Inspection is not required since the condition returns to normal after some driving.

3.2 Diagnosis code generation conditions and inspection items