Group 28 Troubleshooting MID 128 PID 171 Ambient Temperature MID 128 PID 173 Exhaust Temperature 28 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 9 • Abnormal Update Rate • This fault will become active when the Engine Management System (EMS) Module detects that the Ambient Air Temperature message from the Instrument Cluster Module does not exist. • Malfunction indicator lamp illuminated • Faulty Ambient Air Temperature Sensor harness Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 0 • Data valid but above normal operational range — most severe level • Exhaust Gas Temperature is too high • Engine derate • Poor driveability • Faulty Exhaust Gas Temperature (EGT) system • Faulty harness or connector FMI 2 • Data erratic, intermittent or incorrect • Sensor is not rational • Poor driveability • Harness connected to incorrect sensor • Sensor failure FMI 4 • Voltage below normal or shorted low • Short to ground on the metering side of the circuit • Poor driveability • Sensor failure • Faulty harness FMI 5 • Current below normal or open circuit • Short to battery on the metering side of the circuit • Open in the metering side of the circuit • Open in the ground side of the circuit • Poor driveability • Faulty harness • Sensor failure FMI 10 • Abnormal rate of change • Sensor is stuck • Poor driveability • Sensor failure