Symptom Tree
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Operator technique is not correct |
Explain correct engine operation to the operator. Refer to Section 1. |
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Engine is operating above recommended altitude |
Engine power decreases above recommended altitude. Refer to a Cummins Authorized Repair Facility for specifications. |
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Electronic fault codes are active |
For instructions on how to read active fault codes, refer to Diagnostic Fault Codes in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility. |
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Tachometer is notcalibrated or is malfunctioning |
Compare the tachometer reading with a handheld tachometer or an electronic service tool reading. Calibrate or replace the tachometer as necessary. Refer to the OEM service manual. |
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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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Fuel filter is plugged |
Measure the fuel pressure before and after the fuel filter. Refer to a Cummins Authorized Repair Facility. |
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Fuel suction line restricted |
Inspect for pinched, crimped, or kinked fuel lines. Refer to a Cummins Authorized Repair Facility. |
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Fuel leak |
Check the fuel lines, fuel connections, and fuel filters for leaks. Check the fuel lines to the supply tanks. Refer to the OEM service manual. |
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Air intake system restriction is above specification |
Check the air intake system for restriction. Clean or replace the air filter and inlet piping as necessary. Refer to Section 4. |
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Air intake or exhaust leaks |
Check for loose or damaged piping connections and missing pipe plugs. Check the turbocharger and exhaust manifold mounting. Refer to Section 3. |
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Air in the fuel system |
Check for air in the fuel system. Tighten or replace the fuel connections, fuel lines, fuel tank standpipe, and fuel filters as necessary. |
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Vehicle parasitics are excessive |
Check the vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time, and engine-driven units. Refer to the OEM service manual. |
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Fuel tank vents are plugged or damaged |
Remove and clean the tank vents. Replace the vents if necessary. Refer to the OEM service manual. |
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Charge air cooler is restricted or leaking |
Inspect the charge air cooler for air restrictions or leaks. Refer to the OEM service manual. |
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Lubricating oil level is above specification |
Check the oil level. Verify the dipstick calibration and oil pan capacity. Fill the system to the specified level. Refer to Section 5. |
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| Contact a Cummins Authorized Repair Facility |
