Cummins ISB CM550 (1990-94) Fault Code: 243 PID: 121 SPN: 513 FMI: 4 Exhaust Brake Supply Circuit

Circuit Description
The electronic control module (ECM) enables the exhaust brake by sending a signal to the
relay that controls the exhaust brake under certain conditions.

Component Location
Refer to the original equipment manufacturer’s (OEM) diagram for the location of the engine brake.

Categories Cumminz, DTC TRUCKS, ISB CM550 (1990-94) Tags 1990, 94, CM550, Cummins, FaultCode243, FMI4, ISB, PID121, SPN513

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