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 the Engine Power Output Low symptom tree. If acceleration is poor,…

Symptom Tree     Printable Version Keyswitch circuit is malfunctioning Check the vehicle, equipment, or vessel keyswitch circuit. Refer to the OEM service manual.   Engine is…

Symptom Tree     Printable Version Keyswitch circuit is malfunctioning Check the vehicle, equipment, or vessel keyswitch circuit. Refer to a Cummins Authorized Repair Location.   Tachometer…

Symptom Tree     Printable Version Battery cables or connections are loose, broken, or corroded (excessive resistance) Check the battery cables and connections.   Engine-driven units are…

Symptom Tree     Printable Version Air pressure is low in the air tanks Increase air pressure with an external air source. Refer to Procedure 012-021 (Air…

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 Controlled Fuel…