Symptom Tree     Printable Version Crankcase ventilation system is plugged Check and clean the crankcase breather and vent tube. Refer to Procedure 003-021 (Crankcase Ventilation Filter)…

Symptom Tree     Printable Version Coolant temperature gauge is malfunctioning Test the temperature gauge. Repair or replace the gauge if necessary. Refer to the OEM service…

Symptom Tree     Printable Version Electronic fault codes are active For instructions on how to read active fault codes, refer to Procedure 101-007 (Electronic Controlled Fuel…

Symptom Tree     Printable Version Electronic fault codes are active For instructions on how to read active fault codes, refer to Procedure 101-007 (Electronic Control Fuel…

Symptom Tree     Printable Version Radiator or cab heater is leaking coolant Inspect the radiator, cab heater, hoses, and connections. Refer to the OEM service manual.…

Symptom Tree     Printable Version Battery cell is damaged (open circuit) Check the condition of the batteries. Replace the batteries, if necessary. Refer to the OEM…

Symptom Tree     Printable Version Vehicle gauge is malfunctioning Check the vehicle gauge. Refer to the OEM service manual.   Alternator belt is loose or missing…

Symptom Tree     Printable Version Air system leaks Block the vehicle wheels and check the air system for leaks with spring brakes applied and released. Check…

Symptom Tree     Printable Version Air system leaks Block the vehicle wheels and check the air system for leaks with spring brakes applied and released. Check…

Symptom Tree     Printable Version Air intake system restriction to air compressor is excessive Replace the air compressor air cleaner (if installed). Check the air intake…