COVER-STARTING MOTOR 9X4824 - Caterpillar

Use this procedure in order to troubleshoot a low boost pressure or use this procedure if the following diagnostic code is active. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for this code.
Table 1
Diagnostic Code    
Code and Description    Flash Codes    Default Conditions which Generate this Code    System Response    
102-01 Boost Pressure Sensor : Low     25     The boost pressure is below the trip point for high boost pressure.     The code is logged. Also, the engine is derated.    Probable Causes
Derate mode
Air inlet and exhaust system
Fuel supply
Engine speed/timing sensors
Electrical connectorsDerate Mode
Connect Caterpillar Electronic Technician (ET) and check for logged derate events. A status indicator for an active engine derate will appear on Cat ET if a derate is occurring. The engine speed might be limited due to one of the following possible causes: altitude, high exhaust temperatures, air filter restriction, high coolant temperature, aftercooler water temperature and crankcase pressure.Air Inlet and Exhaust System
Check for an air filter restriction. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual.
If air shutoff valves are installed, verify that the air shutoff valves are fully opened.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to the Systems Operation/Testing and Adjusting for information on the air inlet and exhaust system.Fuel Supply
Check the fuel level in the fuel tank. Ensure that adequate fuel is available for the application.Check fuel lines for the following problems: restrictions, collapse and pinched line. Repair the lines and/or replace the lines.
Check the fuel tank for foreign objects which may block the fuel supply. Check for air leaks in the suction line of the fuel pump. Prime the fuel system after you perform the following procedures:
Replacing the fuel filters
Working on the low pressure fuel supply circuit
Replacing fuel injectors
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 operation. Check the fuel pressure after the fuel filter. Refer to the Systems Operation/Testing and Adjusting manual for the 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 and fuel pressure regulating valve. Engine Speed/Timing Sensors
Use Cat ET to monitor the following status parameters while you crank the engine:
"Engine Speed Primary Sensor"Ensure that the engine speed sensor is indicating an engine rpm during cranking. Also, ensure that the status of signal pattern for the engine speed/timing sensor is "Detected".Electrical Connectors
Check for the correct installation of the J14/P14 ECM connector. Check for correct installation of the fuel Injector connectors. Check the wiring harnesses for damage. Refer to Troubleshooting, "Electrical Connectors - Inspect".