Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 5394, Aftertreatment Diesel Exhaust Fluid (DEF) Dosing Valve MID 128 PSID 90 ECM SPN 5485, Aftertreatment Diesel Exhaust Fluid (DEF) Pump Orifice MID 128 PSID 121 86 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 1 • Data valid but below normal operational range • Dosing failure • Aftertreatment Diesel Exhaust Fluid (DEF) dosing amount too low or DEF quality • MIL illuminated • NOx emissions too high • NOx sensor • SCR catalyst malfunction • EGR mass flow failure • SCR inlet temperature sensor FMI 17 • Data valid but below normal operating range - Least severe level • Dosing failure • Aftertreatment Diesel Exhaust Fluid (DEF) dosing amount too low or DEF quality • MIL illuminated • NOx emissions too high • NOx sensor • SCR catalyst malfunction • EGR mass flow failure • SCR inlet temperature sensor Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 11 • Root cause not known • Aftertreatment Diesel Exhaust Fluid (DEF) bleed orifice clogged • MIL illuminated • Yellow electronic malfunction lamp illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Bleed orifice • Aftertreatment Diesel Exhaust Fluid (DEF) pressure sensor