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Cummins ISB CM550 (1990-94) Fault Code: 517 PID: 252 SPN: FMI: Fuel Pump Valve Feedback Error

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Circuit DescriptionA mechanically stuck fuel control valve has been detected by the pump controller. Component LocationThe fuel pump is located on the backside of the gear housing. Shop TalkThis fault is typically set when a fuel pump beginning of injection point error (bit 10) isrecognized at engine speeds of more than 700 rpm and commanded fueling of more than 20mm³ for two seconds at a battery voltage of 9 VDC. In most instances, Fault Code 517 will occur in conjunction with Fault Code 363. The same diagnostic steps can be applied. The fault code can also be triggered by electrical...

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Cummins ISB CM550 (1990-94) Fault Code: 524 PID: 113 SPN: 2 FMI: Switched Droop Selection Circuit

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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...

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Cummins ISB CM550 (1990-94) Fault Code: 527 PID: 154 SPN: 702 FMI: 3 Dual-Output Driver A

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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.

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Cummins ISB CM550 (1990-94) Fault Code: 528 PID: 93 SPN: 93 FMI: 2 Alternate (Switched) Torque Curve Switch Circuit

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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...

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Cummins ISB CM550 (1990-94) Fault Code: 529 PID: SID 051 SPN: 703 FMI: 3 Dual-Output Driver B

Posted by Diezel Solutions on

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.

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