ALTERNATOR GROUP 3P8655 - Caterpillar

Probable Causes
The probable root causes are listed in order below:
Air Inlet System or Exhaust System
Valve Lash
Electronic Unit Injector
Boost Pressure Sensor
Atmospheric Pressure Sensor
Electronic System problem
Personality ModuleRecommended Actions
Perform the following diagnostic procedures in order:
Check the Air Inlet System for restrictions or leakage. Check the Exhaust System for restrictions or leakage. Refer to Testing and Adjusting, "Air Inlet and Exhaust System - Inspect".
Check the valve lash. Refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust".
Check the Electronic Unit Injector.
Ensure that the Electronic Unit Injector Connector (J300/P300) is fully connected and ensure that the Electronic Unit Injector Connector (J300/P300) is free of corrosion.
Ensure that the ECM Engine Harness Connector (J2/P2) is fully connected and ensure that the Engine Harness Connector (J2/P2) is free of corrosion.
Connect an Electronic Service Tool. Use the Cylinder Cutout Test. Access the Cylinder Cutout Test by selecting the "Diagnostic Menu" and the "Diagnostics Test Menu". Run the Cylinder Cutout Test in order to disable each cylinder. Disabling each cylinder allows the technician to isolate the misfiring cylinders.If the misfiring cylinder can be isolated to a specific cylinder, refer to Troubleshooting, "Injector Solenoid Circuit - Test".
Check the Boost Pressure Sensor and the Atmospheric Pressure Sensor.
Connect an Electronic Service Tool.
While the problem is occurring, check for Diagnostic Codes that are related to the Boost Pressure Sensor and the Atmospheric Pressure Sensor. If a Diagnostic Code is found, refer to Troubleshooting, "Engine Pressure Sensor Open or Short Circuit - Test".
Check for an Electronic System problem.
Connect an Electronic Service Tool.
Monitor the Fuel Position, the Rated Fuel Limit and the FRC Fuel Limit.While the vehicle is operating under full load, the parameters should meet