Cummins ISB CM550 (1990-94) Fault Code: 191 PID: 50 SPN: 876 FMI: 11 Air Conditioner Clutch Supply Circuit
Circuit Description
The air conditioner clutch solenoid is a device used by the electronic control module (ECM) to control the air conditioner by sending a signal to open or close the air conditioner clutch solenoid.
Component Location
Refer to an original equipment manufacturer’s (OEM) diagram for the location of the air conditioner
clutch solenoid.
Shop Talk
Air conditioner clutch solenoid could be malfunctioning due to a failed engine harness or a bad ground on the air conditioner clutch connector.
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