Cummins ISB CM550 (1990-94) Fault Code: 245 PID: SID 033 SPN: 647 FMI: 4 Engine Fan Clutch Supply Circuit
Circuit Description
The fan clutch solenoid is a device used by the ECM to control the engine fan by sending a
signal to open or close the fan clutch solenoid.
Component Location
Refer to an original equipment manufacturer’s (OEM) diagram for the location of the fan clutch solenoid.
Shop Talk
1) Fan clutch solenoid could be malfunctioning due to a failed engine harness or a bad
ground on the fan clutch connector.
2) Use your diagnostic tool to make sure that on/off fan feature is enabled and the right ON voltage is chosen.
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