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Cummins ISB CM550 (1990-94) Fault Code: 599 PID: SID 025 SPN: 640 FMI: 14 Auxiliary Commanded Dual Output Shutdown – Special Instructions

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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...

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Cummins ISB CM550 (1990-94) Fault Code: 768 PID: SID 009 SPN: 923 FMI: 11 Output Device Driver (Trransmission Shift Modulation)

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Circuit DescriptionThe output device driver is a device used by the electronic control module (ECM) to control thetransmission shift modulation signal. Component LocationRefer to an OEM diagram for the location of the transmission shift modulator. Shop TalkOutput device driver could be malfunctioning due to a failed engine harness, a bad ground on thetransmission shift modulator connector, or a bad transmission shift modulator.

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Cummins ISB CM550 (1990-94) Fault Code: 779 PID: SID 051 SPN: 703 FMI: 11 OEM Input – Engine Protection

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Circuit DescriptionThe OEM device input to engine protection allows vehicle OEMs to wire up a device, such as ahydraulic oil temperature limit switch, transmission temperature limit switch, etc., to the ECM.Some units have been upfitted with a Fuel Pressure Switch. The ECM will monitor values fromthis device the same as other engine protection inputs, such as coolant level, etc.. If athreshold value is exceeded, engine speed derate will occur and possible engine shutdown. Component LocationThe location of the OEM device is dependent upon the OEM. If the unit has a fuel pressureswitch installed, it is located at the fuel filter...

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