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Table 1
Truck Model Sales Model New Software Part Number Previous Software Part Number
793 793F Tier II 505-8852 485-8816
793F LRC 505-8855 485-8821
797 797B Retrofit LRC 505-8856 485-8824
797F Tier II 505-8851 485-8815
797F LRC 505-8854 485-8819
797F Tier II Custom 486-5853 N/A
797F High Altitude Arrangement 505-8853 485-8818 Note: The 797F Tier II Customer File is for use on only the serial numbers that are specified below:
LAJ00227
LAJ00228
LAJ00311
LAJ00312
LAJ00313
LAJ00317
LAJ00322
LAJ00327
LAJ00508Note: As referenced below, Percent Derate of the engine is common to the percent derate displayed in Cat® Electronic Technician (ET). Percent Power Loss refers to how much of the engine performance capability will be removed. "Percent Derate" as displayed in Cat ET, is always twice the actual percent power loss.The software enhancements and descriptions are listed below.Derates for Fuel Injector Diagnostic Codes
The previous production release of engine software announced inService Magazine, SEPD2039, New Engine Software is Now Available for 793F, 795F, and 797F, 797 Retrofit, and MT5300 Off-Highway Truck Engines had an error for derate of multiple level 2 -7 injector codes. The derate for injector codes was added to provide protection against cylinders going cold or not firing.The new software functionalities for the injector codes are the following:
Level 1 injector -7 codes will activate the check engine light and serve as an indication to the plan the injector for replacement at the next planned maintenance
Level 2 injector -7 codes are more urgent and should be planned for change at the end of the shift
Level 1 injector -7 codes do not contribute to an engine derate
Level 2 injector -7 codes do contribute to derate scenarios. If 2 or more injectors on one back of the engine have active level 2 -7 codes, the engine will be derated by 50% (25% power loss).Note: The -5, -6, -2 injector codes also count towards the active diagnostics and derate on the engine. Multiple faults on one bank of the engine will result in a derate to protect the other cylinders.1684-12 Diagnostic Code For High-Pressure Fuel Pump (HPFP) Failure
The 1684-12 code monitors the output of each of the pumping elements internal to the fuel pump using the rail pressure sensor. The diagnostic is intended to alert the operator that the fuel pump has failed and performance issues or contingent damage may result.The 1684-12 code has been switched from a Level 1 code to a Level 2 code. This change will provide increased visibility and priority to the operator to take action on the fault code.Note: An Advisor Software Update to 502-5113 Monitor Software Gp or newer is required to support the 1684-12 Level 2 code.The 1684-12 code will apply 50%derate (25% power loss) immediately upon detection of the fault code. Caterpillar recommends replacing the HPFP as soon as possible once the code if logged to prevent risk of contingent component damage.Fuel Consumption Optimization For 797F Tier 2, 797F LRC, and 797B Retrofit LRC Engines
Rating optimization has been performed to improve the cycle fuel efficiency for the 797F Tier 2, 797F LRC, and 797B Retrofit LRC engines.Adaptive Throttle Filter
An improved throttle signal filter has been implemented to reduce the rapid swings in engine fueling due to foot bouncing on the pedal while driving in rough terrain.