Symptom Tree     Printable Version Identify lubricating oil contamination Perform an oil analysis to determine the contaminants.   Bulk oil supply is contaminated Check the bulk…

Symptom Tree     Printable Version Verify the oil consumption rate Check the amount of oil added versus the mileage.   Lubricating oil leak (external) Inspect the…

Symptom Tree     Printable Version Turbocharger is not correct Check the turbocharger part number and compare it to the Control Parts List (CPL), Bulletin 3379133 or…

Symptom Tree     Printable Version Vehicle speed is too low for adequate cooling with high engine load Reduce the engine load. Increase the engine (fan) rpm…

Symptom Tree     Printable Version Bulk oil supply is contaminated Check the bulk oil supply. Drain the oil and replace with noncontaminated oil. Replace the oil…

Symptom Tree     Printable Version Bulk coolant supply is contaminated Check the bulk coolant supply. Drain the coolant and replace with noncontaminated coolant. Replace the coolant…

Symptom Tree     Printable Version Verify the complaint If low power is relevant, refer to a Cummins Authorized Repair Location. If acceleration is poor, refer to…

Symptom Tree     Printable Version Fuel shutoff valve (FSOV) is stuck open Verify that the solenoid or coil is not being energized by a short in…

Symptom Tree     Printable Version Load is excessive for engine horsepower rating Reduce the load on the engine. Refer to the OEM service manual.   Tachometer…

Symptom Tree     Printable Version Engine-driven units are engaged Disengage engine-driven units.   Battery cables are not the correct gauge or length Replace the battery cables…