36 RENR5042-02 Troubleshooting Section Throttle Position Sensor 3. Check for air in the low pressure fuel supply system if any of the following procedures have been performed: Desired Speed Input Configuration Direct Fuel Control Mode Replacement of the fuel filters Determine the type of throttle that is used in the application. Program the parameters to match the type of throttle that is used. Refer to Troubleshooting, “Throttle Position Sensor Circuit - Test” for more information. Service on the low pressure fuel supply circuit Replacement of unit injectors 4. Purge air from the low pressure fuel supply circuit.
Refer to Operation and Maintenance Manual, “Fuel System - Prime” for the complete procedure. Note: The engine will have poor performance if the parameters are not programmed correctly. Electrical Connectors Note: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Check for correct installation of the Electronic Control Module (ECM) connectors and the unit injector connectors. Refer to Troubleshooting, “Electrical Connectors - Inspect”. 5. 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.
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 the engine power may be limited. 6. Check the fuel pressure during engine cranking. Check the fuel pressure after the fuel filter. Refer to Systems Operation/Testing and Adjusting, “Fuel System” 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, fuel transfer pump coupling, and fuel pressure regulating valve. Throttle Signal Monitor the throttle signal on Cat ET.
Verify that the throttle signal is stable from the low idle position to the high idle position. Air Inlet and Exhaust System Unit Injectors 1. Check for an air filter restriction. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual for additional information. 1. Use Cat ET to determine if there are any active diagnostic codes for the unit injectors. 2. Perform the injector solenoid test on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM. Refer to Troubleshooting, “Injector Solenoid Circuit - Test” for the proper procedure. 2.
Check the air inlet and exhaust system for restrictions and/or for leaks. Refer to Systems Operation/Testing and Adjusting, “Air Inlet and Exhaust System”. 3. Perform the cylinder cutout test on Cat ET in order to identify any injectors that might be misfiring. Refer to Troubleshooting, “Injector Solenoid Circuit - Test” for the proper procedure. i02173692 Engine Oil in Cooling System SMCS Code: 1348-035; 1350-035 Fuel Supply Probable Causes 1. 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. Engine oil cooler core Cylinder head gasket 2.
Check the fuel tank for foreign objects which may block the fuel supply.