Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 656, Engine Injector Cylinder 6 – MID 128 SID 6 ECM SPN 677, Engine Starter Motor Relay – MID 128 SID 39 43 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal, or shorted to high source • Harness shorted + low side circuit • MIL illuminated • Yellow electronic malfunction lamp illuminated • Engine power loss • Engine running uneven (misfire) • Faulty harness FMI 5 • Current below normal or open circuit • Harness shorted +, – or open high side circuit • Harness shorted – low side circuit • MIL illuminated • Yellow electronic malfunction lamp illuminated • Engine power loss • Engine running uneven (misfire) • Faulty harness • Faulty engine fuel injector FMI 7 • Mechanical system not responding properly • Cylinder balancing data above limit • MIL illuminated • Yellow electronic malfunction lamp illuminated • PTO engaged without ECM knowing • Faulty engine fuel injector • Low cylinder compression • Damaged or flywheel FMI 8 • Abnormal frequency, pulse width, or period • Misfire detected • MIL illuminated • Rough engine idle • Faulty engine fuel injector (possibly clogged) FMI 13 • Out of calibration • Cylinder balancing data above limit • MIL illuminated • Yellow electronic malfunction lamp illuminated • PTO engaged without ECM knowing • Faulty engine fuel injector • Low cylinder compression • Damaged or flywheel FMI 31 • Condition exists • Misfire detected • MIL illuminated • Rough engine idle • Faulty engine fuel injector (possibly clogged) Type of fault:
FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted + • Yellow electronic malfunction lamp illuminated • Engine will not start • Faulty starter relay • Fault harness