Circuit DescriptionThe switched droop circuit allows the operator to select from up to three preprogrammed droopgovernor values using a two- or three-position switch, depending on which value the originalequipment manufacturer (OEM) has provided. Component LocationThe location of the droop switch circuit varies with each OEM and equipment model. Refer tothe OEM manual. Shop TalkThe switch should be monitored for proper operation on INSITE™. If the switch is changingstate correctly on the service tool, then the problem does not lie in the switch circuit. Thethree-position switch has three states:1) Position 1 – open2) Position 2 – closed3) Position 3 – 1500-ohm...

Circuit DescriptionThe dual-output driver A will control engine and vehicle functions by controlling originalequipment manufacturer’s (OEM) devices based on up to 12 selected engine parameters andtwo selected OEM parameters (OEM switch input and OEM pressure input). The solenoidoutput will control functions like a fan clutch, air cleaner restriction indicator, or an oil filterdifferential pressure indicator. Component LocationThe OEM device is dependent upon the OEM. Cummins ISB CM550 (1990-94) Fault Code: 524 PID: 113 SPN: 2 FMI: Switched Droop Selection Circuit Cummins ISB CM550 (1990-94) Fault Code: 517 PID: 252 SPN: FMI: Fuel Pump Valve Feedback Error Cummins ISB CM550 (1990-94)...

Circuit DescriptionThe torque curve switch circuit allows the operator to select from up to three preprogrammedtorque curves using a two- or three-position switch depending on which curve the originalequipment manufacturer (OEM) has provided. Component LocationThe location of the torque curve switch circuit varies with each OEM and equipment model.Refer to the OEM manual. Shop TalkThe switch should be monitored for proper operation in INSITE™. If the switch is changingstate correctly on the service tool, then the problem does not lie in the switch circuit. Thethree-position switch has three states: 1) Position 1 – open2) Position 2 – closed3) Position 3...

Circuit DescriptionThe dual-output driver B will control engine and vehicle functions by controlling originalequipment manufacturer (OEM) devices based on up to 12 selected engine parameters andtwo selected OEM inputs (the OEM switch and the OEM pressure). The solenoid output willcontrol functions like a fan clutch, intake grid heater, air cleaner restriction indicator, or an oilfilter differential pressure indicator. Component LocationThe location of the OEM device is dependent upon the OEM. Cummins ISB CM550 (1990-94) Fault Code: 528 PID: 93 SPN: 93 FMI: 2 Alternate (Switched) Torque Curve Switch Circuit Cummins ISB CM550 (1990-94) Fault Code: 527 PID: 154 SPN: 702...

Circuit DescriptionDual outputs based on sensed parameters provide up to two independent switched outputs fororiginal equipment manufacturer (OEM) use. The state of each switched output can bedetermined by different inputs to the engine control module (ECM) depending on the engineplatform. The ECM can provide different outputs to OEM devices if any of the inputs are aboveor below calibrated thresholds. Each switched output is independent of the other with respectto control parameter input and threshold settings. Component LocationThe dual outputs features are OEM dependent. Use the following for a detailed componentlocation view. See equipment manufacturer service information. Shop TalkThis fault code...