HARNESS AS-ENGINE 4182088 - Caterpillar

Probable Causes
Diagnostic codes
Event codes
Throttle signal
Cold mode
Starting aids
Intake manifold (boost) pressure
Fuel supply
Air inlet and exhaust system
Accessory equipment
Specific conditionsRecommended Actions
Diagnostic Codes and Event Codes
Certain diagnostic codes and/or event codes may cause poor performance. Connect Caterpillar Electronic Technician (ET) and check for active codes and/or logged codes. Troubleshoot any codes that are present before continuing with this procedure.Throttle Signal
Monitor "Throttle Position" on Cat ET. Verify that the appropriate parameter is programmed to the correct value. Verify that you can achieve full throttle. Refer to Troubleshooting, "System Configuration Parameters". Refer to diagnostic functional tests Troubleshooting, "Throttle Position Sensor Circuit - Test".Intake Manifold (Boost) Pressure
Monitor "Fuel Position" and "Rated Fuel Limit" on the electronic service tool. If "Fuel Position" does not equal "Rated Fuel Limit", then check the intake manifold pressure.
Monitor the status of the intake manifold pressure on the electronic service tool for normal operation.Cold Mode
Use the electronic service tool to verify that the engine has exited cold mode. A status flag will appear if the engine is operating in cold mode. This may limit engine speed.Starting Aids
Verify the correct operation of the air inlet heater (if equipped). For additional information on the air inlet heater, refer to diagnostic functional tests Troubleshooting, "Air Inlet Heater Circuit - Test".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.
Prime the fuel system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuit
Replacement of unit injectorsNote: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation.
Check the fuel pressure during engine cranking. Check the fuel pressure on the outlet side of the fuel filter. Refer to Testing and Adjusting for correct pressure values. If the fuel pressure is low, replace the fuel filters. If the fuel pressure is still low, check the following items: fuel transfer pump, fuel transfer pump coupling and fuel pressure regulating valve.Air Inlet and Exhaust System
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 for leaks. Refer to Testing and Adjusting.Accessory Equipment
Check all accessory equipment for problems that may create excessive load on the engine. Repair any damaged components or replace any damaged components.Check the actual size of the prop. An oversized prop can cause an engine overload. Install the recommended prop if an oversized prop is being used.Specific Conditions
An engine overload may be caused by specific conditions which may exist. The following two conditions can cause this problem.
Obstructions on the hull may have buildup which can cause the engine to be overloaded. Refer to Operation and Maintenance