Symptom Tree
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Fuel level is low in the tank |
Fill the supply tank. Refer to the OEM service manual. |
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Electronic fault codes are active |
For instructions on how to read active fault codes, refer to Procedure (Electronic Controlled Fuel System) in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility. |
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Condition occurs only at idle |
Refer to the Engine Runs Rough at Idle symptom tree. |
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Engine is cold |
Allow the engine to warm to operating temperature. If the engine will not reach operating temperature, refer to the Coolant Temperature is Below Normal symptom tree. |
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Fuel leak |
Check the fuel lines, fuel connections, and fuel filters for leaks using the combustible gas detector service tool. Refer to a Cummins Authorized Repair Facility. |
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Ignition coil malfunctioning |
Check the ignition coil. Refer to Procedure 013-012 (Ignition Coil) in Section 6. |
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Spark plug(s) damaged or incorrect gap |
Inspect plug(s). Refer to Procedure 013-016 (Spark Plugs) in Section 6. |
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Battery voltage is low or bad ground connection at battery |
Check the batteries. Check the battery circuit. The battery cable ground must measure within OEM specifications for voltage drop under electrical load. Refer to the OEM service manual. |
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Oil from the fuel has accumulated on the gas mass flow sensor, screen packs, or elsewhere in the fuel system |
Check for oil in the fuel system. Refer to a Cummins Authorized Repair Facility. |
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Fuel grade is not correct for the application or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Procedure 018-002 (Fuel Recommendations and Specifications) in Section V. |
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Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004 (Overhead Set) in Section 6. |
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| Contact a Cummins Authorized Repair Facility |
