CAB AR 1598367 - Caterpillar

Probable Causes
Diagnostic codes
Event codes
Flash file
Coolant temperature sensor
Water temperature regulators
Starting aid
Fuel quality
Cylinder performance
Unit injectors
Cooling systemRecommended Actions
Diagnostic Codes and Event Codes
Connect Caterpillar Electronic Technician (ET) and check for active codes and/or for logged codes. Troubleshoot any active codes that are present before continuing with this procedure.Note: If a E390 Fuel Filter Restriction is logged and/or active, replace the fuel filters.Note: If a E198 Low Fuel Pressure is logged and/or active, refer to the symptom Troubleshooting, "Fuel Pressure Is Low". Flash File
Verify that the correct flash file is installed. Refer to service Troubleshooting, "ECM Software - Install".Coolant Temperature Sensor
Use Cat ET to verify that the engine has exited cold mode.
Compare the coolant temperature from Cat ET to the coolant temperature that is obtained from the 6V-9130 Temperature Adapter (MULTIMETER). Ensure that the temperature readings are reasonable for the conditions that are present.
If necessary, replace the coolant temperature sensor. Refer to Disassembly and Assembly.Water Temperature Regulator
Check that the water temperature regulator is operating correctly. Refer to Testing and Adjusting.Starting Aid
Verify that the starting aid is operating correctly. Refer to circuit tests Troubleshooting, "Starting Aid - Test".Fuel Quality
Check the diesel fuel for quality. Refer to the Operation and Maintenance Manual.Note: Diesel fuel with a low cetane value is likely to cause white smoke.Cylinder Performance
Check for correct installation of the unit injector connectors. Check for correct installation of all other applicable connectors. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder. Refer to Disassembly and Assembly.Note: Discard all fuel injection lines after use. Fuel injection lines must only be used one time.
Perform a compression test. Refer to Testing and Adjusting. Possible causes of low compression are shown in the following list:
Faulty piston
Faulty piston rings
Worn cylinder bores
Worn valves
Faulty cylinder head gasket
Damaged cylinder head
Perform all necessary repairs. Ensure that the repairs have eliminated the problem.
If the repair does not eliminate the problem, reinstall the electronic unit injectors that were removed and continue with this test procedure.Note: Discard all fuel injection lines after use. Fuel injection lines must only be used one time.Electronic Unit Injectors
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized.
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder and install a new electronic unit injector. Refer to Disassembly and Assembly.Note: Discard all fuel injection lines after use. Fuel injection lines must only be used one time.
Ensure that the repairs have eliminated the problem. If there is still a problem, refer to the circuit test Troubleshooting, "Injector Solenoid - Test".Cooling System
Check for an internal coolant leak. Check for coolant in the engine oil, coolant in the cylinders, and coolant in the exhaust system. Refer to Systems Operation/Testing and Adjusting.