BOOM CYLINDER GROUP 1505901 - Caterpillar

Probable Causes
Active engine derate
Cold mode
Throttle switch
Decelerator pedal
Electrical connectors
Unit injectors
Turbocharger outlet pressure sensor
Air inlet and exhaust system
Parameters
Fuel supplyRecommended Actions
Active Engine Derate
Use Caterpillar Electronic Technician (ET) to check for logged engine derates and/or active engine derates. A derate status flag will appear on Cat ET if an active engine derate is occurring. The engine may be derated due to one of the following conditions: high altitude, dirty air filters and other factors.Cold Mode
Use Cat ET to verify that the engine has exited cold mode. Cold mode operation may cause the engine to run rough and engine power may be limited.
Observe the coolant temperature on the Cat ET status screen. Verify that the reading is valid.Throttle Switch
Monitor the throttle switch on Cat ET. Verify that the throttle switch is operating correctly. Refer to Troubleshooting, "Throttle Switch Circuit - Test" for the proper troubleshooting procedure.Decelerator Pedal
Monitor the decelerator pedal on Cat ET. Verify that the decelerator pedal is operating properly. Refer to Troubleshooting, "Decelerator Position Sensor Circuit - Test" for the proper troubleshooting procedure.Electrical Connectors
Check for correct installation of the J1/P1 and J2/P2 connector and the unit injector connectors for the Electronic Control Module (ECM). Refer to Troubleshooting, "Electrical Connectors - Inspect".Unit Injectors
Use Cat ET to determine if there are any active diagnostic codes for the unit injectors.
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM.
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any misfiring cylinder(s). Refer to Troubleshooting, "Injector Solenoids Circuit - Test" for more information.Turbocharger Outlet Pressure Sensor
Monitor the status of "Fuel Position", "Rated Fuel Limit", and "FRC Fuel Limit" on Cat ET while the engine is operating under full load. These parameters should reflect the information below.
Table 1
"Fuel Position" = "Rated Fuel Limit"    
AND    
"Fuel Position" < "FRC Fuel Limit"    If "Fuel Position" equals "Rated Fuel Limit" and "Fuel Position" is less than "FRC Fuel Limit", the electronics are operating correctly. Otherwise, proceed with the next step.
Monitor the status of "Boost Pressure" and "Atmospheric Pressure" for normal operation on Cat ET. When the engine is not running, "Boost Pressure" should be 0 kPa (0 psi).Air Inlet and Exhaust System
Observe the check engine lamp. Check for an air filter restriction indicator. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Testing and Adjusting, "Air Inlet and Exhaust System".Parameters
If the ECM has been replaced, compare the values on the engine information plate to the following parameters from Cat ET:
Fuel Ratio Control (FRC) offset.
Full Load Setting (FLS)
Full Torque Setting (FTS)Fuel Supply
Check the fuel lines for the following problems: restrictions, collapsed lines and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines.
Check the fuel tank for foreign objects which may block the fuel supply.
Check for air in the low pressure fuel supply system if