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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: 377 PID: SID 233 SPN: 107 FMI: 7 Fuel Pump Power Relay Stuck-On

Circuit Description
This circuit is internal to the ECM. If the keyswitch is turned off and the ECM still detects
messages being sent from the fuel pump, the ECM will log this fault.

Component Location
This circuit logic is internal to the ECM.

Shop Talk
1) Some older ISB engines use a different original equipment manufacturer (OEM) interface
connector than illustrated.
2) Fault Code 377 can be caused by a stuck fuel pump relay. If voltage is detected at pin 7
of the fuel pump connector, with the keyswitch in the OFF position, check for a faulty fuel
pump relay.

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