Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 2791, Engine Exhaust Gas Recirculation (EGR) Valve Control – MID 128 SID 146 ECM SPN 2836, Battery Potential/Switched Voltage – MID 128 PSID 49 54 FMI 1 • Data valid but below normal operational range • EGR flow is too low • MIL illuminated • Faulty EGR system • Clogged EGR cooler FMI 16 • Data valid but above normal operating range - Moderately severe level • EGR flow is too high • MIL illuminated • Exhaust smoke • Faulty EGR system • Faulty harness or connector FMI 18 • Data valid but below normal operating range - Moderately severe level • EGR flow is too low • MIL illuminated • Faulty EGR system • Clogged EGR cooler • Faulty harness or connector Type of fault:
FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Voltage above normal, or shorted to high source • Stuck EGR valve • EGR valve circuit shorted + • EGR valve circuit shorted to – • MIL illuminated • Engine derate • Faulty harness or connector • Faulty EGR valve FMI 5 • Current below normal or open circuit • Open EGR valve circuit • MIL illuminated • Engine derate • Faulty harness or connector • Faulty EGR valve Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal, or shorted to high source • Battery voltage too high • N/A • Faulty cab or chassis harness • Charging system fault • External charger FMI 4 • Voltage below normal, or shorted to low source • Battery voltage too low • Starter will not crank • Faulty cab or chassis harness • Charging system fault • Battery • Fuse