Circuit Description
The engine position sensor (EPS), the intake manifold pressure sensor, and the oil pressure sensor are powered by the same +5-VDC source and the same return in the electronic control module (ECM). This supply is also used to operate the intake manifold temperature and coolant temperature
sensors.
Component Location
The +5-VDC sensor supply circuit is located in the sensor harness. Refer to Procedure 100-002 (Engine Diagrams) in Section E for the sensor locations.
Shop Talk
These faults could also cause high-voltage or low-voltage faults on the coolant temperature and intake manifold temperature sensors.
Cummins ISB CM550 (1990-94) Fault Code: 349 PID: 191 SPN: 191 FMI: 0 Auxiliary Speed or Auxiliary Pressure Input Error
Cummins ISB CM550 (1990-94) Fault Code: 298 PID: 223 SPN: 1084 FMI: 4 OEM Pressure Sensor Circuit
Cummins ISB CM550 (1990-94) Fault Code: 297 PID: 223 SPN: 1084 FMI: 3 OEM Pressure Sensor Circuit
Cummins ISB CM550 (1990-94) Fault Code: 286 PID: SID 231 SPN: 639 FMI: 13 J1939 Datalink Multiplexing
Cummins ISB CM550 (1990-94) Fault Code: 285 PID: SID 231 SPN: 639 FMI: 9 J1939 Datalink Multiplexing
Cummins ISB CM550 (1990-94) Fault Code: 284 PID: 190 SPN: 190 FMI: 4 Engine Speed Sensor Supply
