SAE J1939 fault codes for liquid and gaseous fuel systems. Includes SPN and FMI diagnostic codes for fuel consumption, fuel economy, fuel injection, gaseous fuel pressure, alternate fuel systems, and fuel leakage detection on heavy-duty engines.
Diagnostic Code SPN 231 FMI 9: Meaning and Fix SPN 231 FMI 9 indicates an abnormal update rate related to trip fuel data in gaseous engines. This error is typically encountered after an ECU update or a sensor replacement, where the communication between the ECM and the fuel monitoring system becomes inconsistent. As a result, … Read more
Diagnostic Code SPN 230 FMI 5: Meaning and Fix SPN 230 FMI 5 indicates current below normal or open circuit in the gaseous fuel measurement system for total idle fuel consumption tracking. This fault commonly appears in CNG/LNG powered equipment when fuel flow sensors experience wiring degradation or connector corrosion. Technicians frequently encounter this code … Read more