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CLAAS MetaDiag 2007 Update 2016 is a crucial software tool for diagnosing issues in CLAAS agricultural machinery. It enhances efficiency and supports maintenance activities through advanced features and user-friendly design. This update includes improvements in diagnostic capabilities, compatibility, and installation processes. Designed for easy use, it is vital for technicians managing heavy machinery and trucks, ensuring optimal performance and reduced downtime.
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Cummins ISB CM550 (1990-94) Fault Code: 278 PID: 73 SPN: 1075 FMI: 11 (Ford Truck Application) Lift Pump Circuit

Circuit Description
The electronic control module (ECM) enables the lift pump by sending a signal directly to the
lift pump. The ECM fast-duty cycles the lift pump ON and OFF during cranking, and it enables
the pump once the engine has started.

Component Location
The lift pump is mounted to the engine block on the intake side, toward the rear of the engine.

Shop Talk
1) The lift pump is turned on for approximately 5 seconds when the keyswitch is first turned
ON. With the hood raised, it is possible to hear the lift pump running when the keyswitch
is turned ON.
2) Loose battery connections can sometimes cause this fault code.

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