Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 4334, Afterteatment Diesel Exhaust Fluid (DEF) Dosing Absolute Pressure MID 128 PPID 273 ECM SPN 4339, Aftertreatment SCR Feedback Control Status – MID 128 PSID 90 78 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 1 • Data valid but below normal operational range - Most severe level • DEF system leakage detected • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • DEF pump • DEF hose • Aftertreatment DEF dosing (injector) FMI 4 • Voltage below normal, or shorted to low source • Short Circuit - • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • DEF pump assembly FMI 5 • Current below normal or open circuit • Short Circuit + • Open Circuit • MIL illuminated • Yellow electronic malfunction lamp illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • DEF pump assembly Type of fault: FMI Description: Fault Condition: Possible Symptoms:
Possible Cause: FMI 0 • Data valid but above normal operational range - Most severe level • Adaptation too high • N/A • NOx sensor • Aftertreatment Diesel Exhaust Fluid (DEF) dosing system failure FMI 1 • Data valid but below normal operational range - Most severe level • Adaptation too low • N/A • NOx sensor • Aftertreatment Diesel Exhaust Fluid (DEF) dosing system failure • DEF quality FMI 10 • Abnormal rate of change • Adaptation too high • N/A • NOx sensor • Aftertreatment Diesel Exhaust Fluid (DEF) dosing system failure FMI 12 • Bad intelligent device or component • Adaptation too low • N/A • NOx sensor • Aftertreatment Diesel Exhaust Fluid (DEF) dosing system failure • DEF quality