SHIM 5D6644 - Caterpillar

Probable Causes
Diagnostic Trouble Codes
Active codes and logged codesParameters
Incorrect parameter settingsAir Inlet and Exhaust System
Restriction in the air inlet and exhaust systemFuel Supply
Unstable fuel supply
Unstable fuel injectionAccessory Equipment
Engine accessories
Parasitic loadsRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.Active Codes and Logged Codes
Check for active diagnostic codes on Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure.Incorrect Parameter Settings
Use Cat ET to verify that the correct parameter settings are being used. Refer to Troubleshooting, "Configuration Parameters" for the proper information.Restriction in the 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. Unstable Fuel Supply
Visually check the fuel level in the fuel tank. Do not rely on the fuel gauge only.
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Inspect the fuel system.
Cold weather adversely affects the characteristics of the fuel. Refer to the engine's Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation.
Check fuel quality. Check the fuel tank for debris or foreign objects which may block the fuel supply.
Check the filtered fuel pressure while the engine is being cranked. If the fuel pressure is low, replace the fuel filters. Clean the primary filter/water separator of debris. Refer to the Operation and Maintenance Manual for details. Also, check for the proper operation of the fuel transfer pump.Unstable Fuel Injection
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 determine the performance of each cylinder. Refer to Troubleshooting, "Injector Solenoid - Test" for additional information. Engine Accessories
Inspect any engine accessories and the transmission (if applicable). Repair any problems that may create excessive load on the engine.