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Isuzu US-IDSS 2024 Diagnostic is a comprehensive tool for the effective maintenance and repair of Isuzu vehicles. It integrates advanced diagnostic features to assist technicians in identifying and resolving issues promptly. This system supports a wide range of Isuzu models, ensuring compatibility with both US and Canadian specifications. Its capabilities include vehicle recognition, fault code analysis, and real-time data access to streamline the diagnostic process.
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Cummins ISB CM550 (1990-94) Fault Code: 517 PID: 252 SPN: FMI: Fuel Pump Valve Feedback Error

Circuit Description
A mechanically stuck fuel control valve has been detected by the pump controller.

Component Location
The fuel pump is located on the backside of the gear housing.

Shop Talk
This fault is typically set when a fuel pump beginning of injection point error (bit 10) is
recognized at engine speeds of more than 700 rpm and commanded fueling of more than 20
mm³ for two seconds at a battery voltage of 9 VDC. In most instances, Fault Code 517 will occur in conjunction with Fault Code 363. The same diagnostic steps can be applied. The fault code can also be triggered by electrical noise,
voltage feedback on ground loop, or high fuel return line restriction.

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