Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 729, Intake Air Heater (IAH) 1 – MID 128 SID 70 ECM SPN 730, Intake Air Heater (IAH) 2 – MID 128 SID 71 44 FMI 5 • Current below normal or open circuit • Open circuit • Yellow electronic malfunction lamp illuminated • Engine will not start • Faulty starter relay • Fault harness Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted +, measuring line • Yellow electronic malfunction lamp illuminated • Faulty preheat relay • Faulty intake air heater (IAH) 1 FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted –, measuring line • Yellow electronic malfunction lamp illuminated • Faulty preheat relay • Faulty intake air heater (IAH) 1 FMI 5 • Current below normal or open circuit • Open circuit • Yellow electronic malfunction lamp illuminated • Faulty intake air heater (IAH) 1 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted +, measuring line • Yellow electronic malfunction lamp illuminated • Faulty preheat relay • Fautly intake air heater (IAH) 2 FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted –, measuring line • Yellow electronic malfunction lamp illuminated • Faulty preheat relay • Fautly intake air heater (IAH) 2