Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 3491, Aftertreatment Diesel Particulate Filter (DPF) Atomization Air Actuator MID 128 PSID 59 70 FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted to + • MIL illuminated • Yellow electronic malfunction lamp illuminated • Regeneration not possible • Faulty harness • Faulty connector • Faulty combustion air valve FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted to – • MIL illuminated • Yellow electronic malfunction lamp illuminated • Regeneration not possible • Faulty harness • Faulty connector • Faulty combustion air valve FMI 5 • Current below normal or open circuit • Open circuit • MIL illuminated • Yellow electronic malfunction lamp illuminated • Failed regeneration • Regeneration not possible • Faulty harness • Faulty connector • Faulty combustion air valve Type of fault:
FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted to + • MIL illuminated • Yellow electronic malfunction lamp illuminated • Aborted regeneration • Regeneration not possible • Faulty harness • Faulty atomization air valve FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted to – • MIL illuminated • Yellow electronic malfunction lamp illuminated • Regeneration not possible • Faulty harness • Faulty atomization air valve