19 april, 2025 Cummins ISB CM550 (1990-94) Fault Code: 241 PID: 84 SPN: 84 FMI: 2 Vehicle Speed Sensor Circuit Circuit DescriptionThe vehicle speed sensor (VSS) uses two separate coils of wire (some applications use asingle-coil sensor) to count gear...
19 april, 2025 Cummins ISB CM550 (1990-94) Fault Code: 242 PID: 84 SPN: 84 FMI: 10 Vehicle Speed Sensor (VSS Circuit Circuit DescriptionThe vehicle speed sensor (VSS) uses two separate coils of wire (some applications use asingle-coil sensor) to count gear...
19 april, 2025 Cummins ISB CM550 (1990-94) Fault Code: 243 PID: 121 SPN: 513 FMI: 4 Exhaust Brake Supply Circuit Circuit DescriptionThe electronic control module (ECM) enables the exhaust brake by sending a signal to therelay that controls the exhaust...
19 april, 2025 Cummins ISB CM550 (1990-94) Fault Code: 245 PID: SID 033 SPN: 647 FMI: 4 Engine Fan Clutch Supply Circuit Circuit DescriptionThe fan clutch solenoid is a device used by the ECM to control the engine fan by sending asignal...
18 april, 2025 Cummins ISB CM550 (1990-94) Fault Code: 2559 PID: SPN: 1845 FMI: 4 Transmission ECU to ECM Communication – Abnormal Update Rate Circuit DescriptionNormally, switches, accelerators, and other components are connected to the engine controlmodule (ECM) directly through individual wires. Multiplexing allows...
18 april, 2025 Cummins ISB CM550 (1990-94) Fault Code: 261 PID: 168 SPN: 174 FMI: 0 Pump High Fuel Temperature Error/Overheat Error Circuit DescriptionThe fuel temperature sensor is located in the fuel pump. Fuel temperature information ispassed to the engine control module...