Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 3511, Sensor Supply Voltage 3 – MID 128 PSID 113 ECM SPN 3512, Sensor Supply Voltage 4 – MID 128 PSID 126 ECM SPN 3522, Aftertreatment Total Fuel Used – MID 128 PSID 91 72 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted + • MIL illuminated • Faulty harness FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted – • MIL illuminated • Faulty harness Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal, or shorted to high source • Sensor supply circuit shorted + • MIL illuminated • Incorrect sensor values • Faulty harness FMI 4 • Voltage below normal, or shorted to low source • Sensor supply circuit shorted – • MIL illuminated • Incorrect sensor values • Faulty harness Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 0 • Data valid but above normal operational range • Aftertreatment Diesel Exhaust Fluid (DEF) level change too much • N/A • DEF system leak • Wrong DEF tank • Aftertreatment DEF Dosing Module failure or wrong module FMI 1 • Data valid but below normal operational range • Aftertreatment Diesel Exhaust Fluid (DEF) level change too little • N/A • DEF tank level sensor stuck • DEF system clog • Wrong DEF tank • Aftertreatment DEF Dosing Module failure or wrong module