Cummins ISB CM550 (1990-94) Fault Code: 376 PID: 1691 SPN: FMI: Fuel Pump rpm and Fuel Error

Circuit Description
This diagnostic is meant to act as a speed and fueling rationality check between the engine
control module (ECM) and the fuel pump control module.

Component Location
The logic for this fault code is contained in the ECM and the fuel pump control module.

Shop Talk
False alarms caused by speed transitions, such as sudden accelerations or engine stall
checks, can trigger this fault code.

Cummins ISB CM550 (1990-94) Fault Code: 375 PID: SID 254 SPN: FMI: 2 Engine Control Module (ECM) Fuel Calibration Corrupted

Cummins ISB CM550 (1990-94) Fault Code: 375 PID: 602 SPN: FMI: 2 Engine Control Module (ECM) Fuel Calibration Corrupted

Cummins ISB CM550 (1990-94) Fault Code: 374 PID: 1688 SPN: FMI: Fuel Pump Calibration Error

Cummins ISB CM550 (1990-94) Fault Code: 373 PID: SID 233 SPN: 1077 FMI: 3 Fuel Pump Fuel Shut Off Error

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