Group 28 Troubleshooting MID 128 PID 411 EGR Exhaust Back Pressure 31 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 2 • Data erratic, intermittent or incorrect • EGR differential pressure sensor output is too high or too low • Uneven running • Engine derate • Faulty EGR Differential Pressure Sensor connector • Faulty EGR Differential Pressure Sensor harness • Faulty EGR Differential Pressure Sensor • EGR leakage • Clogged EGR cooler • Clogged EGR venturi FMI 3 • Voltage above normal or shorted to high source • Short to battery in metering line • Open in the ground circuit • Engine responds poorly • Engine derate • Faulty EGR Differential Pressure Sensor connector • Faulty EGR Differential Pressure Sensor harness • Faulty EGR Differential Pressure Sensor FMI 5 • Current below normal or open circuit • Open in the 5 volt supply line • Short to ground in metering line • Open in the metering line • Engine responds poorly • Engine derate • Faulty EGR Differential Pressure Sensor connector • Faulty EGR Differential Pressure Sensor harness • Faulty EGR Differential Pressure Sensor