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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: 366 PID: 1287 SPN: FMI: Fuel Pump Voltage Measurement Error

Circuit Description
Battery voltage to the fuel pump is passed to the engine control module (ECM) through the controller area network datalink.

Component Location
The voltage measurement is located within the pump control module.

Shop Talk
1) This fault is set when the fuel pump control module registers a voltage value outside of its threshold limits (6.5 to 18-volt) for 0.5 second.
2) The fuel pump fully compensates for voltage fluctuations within its signal range check. Excessive voltage (more than 24-volt) will damage the pump controller.
3) Troubleshooting must focus on sources of high or low voltage or engine grounding.

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