50 RENR5042-02 Troubleshooting Section Cold Mode Operation 3. Monitor the “Boost Pressure” and “Atmospheric Pressure” for normal operation. When the engine is not running, “Boost Pressure” should be 0 kPa (0 psi). Monitor the status screen on Cat ET in order to verify that the engine has exited cold mode. Observe the reading for coolant temperature on the Cat ET. Refer to Troubleshooting, “System Overview” for additional information. Air Inlet and Exhaust System Flash File 1. Check for an air filter restriction indicator. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual. Verify that the correct flash file is installed. 2.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting, “Air Inlet and Exhaust System”. Throttle Position Sensor Monitor “Throttle Status” on Cat ET. Verify that the throttle position is stable and that the engine is able to reach high idle rpm. Refer to Troubleshooting, “Throttle Position Sensor Circuit - Test” for the proper troubleshooting procedure. Fuel Supply 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.
Electrical Connectors Check for correct installation of the J1/P1 and J2/P2 connectors for the Electronic Control Module (ECM). Check for correct installation of the JH300/P300 unit injector connectors. Refer to Troubleshooting, “Electrical Connectors - Inspect”. 2. Check the fuel tank for foreign objects which may block the fuel supply. 3. Check for air in the low pressure fuel supply system if any of the following procedures have been performed: Unit Injectors 1. Use Cat ET to determine if there are any active diagnostic codes for the unit injectors. Replacement of the fuel filters Service on the low pressure fuel supply circuit 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. Replacement of unit injectors Note: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Testing and Adjusting for more information. 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. NOTICE Do not crank the engine continuously for more than 30 seconds.
Allow the starting motor to cool for two minutes before cranking the engine again. Fuel Position, Rated Fuel Limit, and FRC Fuel Position 4. Purge air from the low pressure fuel supply circuit. Refer to Operation and Maintenance Manual, “Fuel System - Prime” for the correct procedure. 1. Monitor the status of “Fuel Position” and “Rated Fuel Limit” while the engine is operating under full load. If “Fuel Position” equals “Rated Fuel Limit” and “Fuel Position” is less than “FRC Fuel Limit”, the electronics are operating correctly. Otherwise, proceed to the next Step. 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. 2. Verify that there are no active diagnostic codes for the boost pressure sensor.