Circuit Description
Power is supplied to the through a relay. When the engine control module (ECM) switches the relay, power is supplied from the battery, through the relay, to the fuel pump.
Component Location
Internal to the pump.
Shop Talk
The fuel pump control module compares battery voltage to supply voltage while energizing the fuel metering solenoid. If this measured voltage drop is excessive, there is high resistance in the fuel pump power supply circuit.
Cummins ISB CM550 (1990-94) Fault Code: 364 PID: SID 233 SPN: 1077 FMI: 9 Engine Control Module (ECM) to Pump Communications Error
Cummins ISB CM550 (1990-94) Fault Code: 364 PID: 1689 SPN: 1077 FMI: 9 Engine Control Module (ECM) to Pump Communications Error
Cummins ISB CM550 (1990-94) Fault Code: 363 PID: SID 251 SPN: 1076 FMI: 7 Fuel Pump Control Valve Feedback Error
Cummins ISB CM550 (1990-94) Fault Code: 363 PID: 251 SPN: 1076 FMI: 7 Fuel Pump Control Valve Feedback Error
Cummins ISB CM550 (1990-94) Fault Code: 362 PID: SID 251 SPN: 1076 FMI: 4 Fuel Valve High Current Error
Cummins ISB CM550 (1990-94) Fault Code: 362 PID: 253 SPN: 1076 FMI: 4 Fuel Valve High Current Error
