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.
Cummins ISB CM550 (1990-94) Fault Code: 243 PID: 121 SPN: 513 FMI: 4 Exhaust Brake Supply Circuit
Cummins ISB CM550 (1990-94) Fault Code: 242 PID: 84 SPN: 84 FMI: 10 Vehicle Speed Sensor (VSS Circuit
Cummins ISB CM550 (1990-94) Fault Code: 241 PID: 84 SPN: 84 FMI: 2 Vehicle Speed Sensor Circuit
Cummins ISB CM550 (1990-94) Fault Code: 235 PID: 111 SPN: 111 FMI: 1 Engine Coolant Level – Engine Protection
Cummins ISB CM550 (1990-94) Fault Code: 234 PID: 190 SPN: 190 FMI: 0 Engine Overspeed Circuit
Cummins ISB CM550 (1990-94) Fault Code: 222 PID: 108 SPN: 108 FMI: 4 Ambient Air Pressure Sensor Circuit
