Group 28 Troubleshooting MID 128 PID 26 Fan Speed Percent MID 128 PID 45 Preheater Relay 16 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Voltage above normal or shorted to high • Missing signal from Fan Speed Sensor • Short Circuit +, Measuring line • Short Circuit -, Measuring line • Open Circuit, Measuring line • Open Circuit, Ground line • Higher fuel consumption • Will work as on/off fan, 100%fan speed if cooling is needed • Cooling Fan Speed (CFS) sensor failure • Faulty Cooling Fan Speed (CFS) sensor harness Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal or shorted to high • Short Circuit +, Measuring line • Preheat relay not activated • White smoke for cold start • Start problems in cold climate • Preheat relay solenoid shorted FMI 4 • Voltage below normal or shorted low • Short Circuit -, Measuring line • Induction air is hot • Preheat relay is impossible to turn off • Faulty harness FMI 5 • Current below normal or open circuit • Open Circuit • Preheat relay not activated • White smoke for cold start • Start problems in cold climate • Faulty Preheat relay • Faulty harness