The Engine Control Module (ECM) detects the following conditions:
•The 5 volt supply is greater than 5.16 VDC for more than one second.
•The ECM has been powered for at least three seconds.
Sensors that are regulated with 5V: Boot pressure, atmosphere pressure, engine oil pressure, coolant temperature, intake manifold air temperature, fuel temperature
Probable Causes:
1) ECM Connection/Harness
2) Sensor Failure
3) Sensor wiring failure
4) ECM Failure
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 21 PID: SPN: 41 FMI: 4 8 Volt Supply voltage low
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 21 PID: SPN: 41 FMI: 3 8 Volt Supply voltage high
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 16 PID: SPN: 173 FMI: 11 Very High Exhaust Gas Temperature Derate
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 16 PID: SPN: 173 FMI: 0 High Exhaust Gas Temperature Derate
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 14 PID: SPN: 122 FMI: 6 Med/High Retarder current high
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 14 PID: SPN: 122 FMI: 5 Med/High Retarder current low
