Symptom Tree t033
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual for CELECT™ |
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Verify the complaint |
If low power is relevant, refer to the OEM instructions. If acceleration is poor, refer to the Engine Acceleration or Response Poor symptom tree. If fuel consumption is relevant, continue with this tree. |
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Perform a throttle response test (if applicable) |
Perform a throttle response test. Refer to the OEM instructions. |
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Perform a stall speed test (if applicable) |
Perform a stall speed test. Refer to Procedure 005-054. |
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Throttle position sensor is misadjusted or malfunctioning |
Check throttle position sensor for proper adjustment and operation. Refer to the OEM specifications. |
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Programmable parameters or selected features are not correct |
Check the programmable parameters and the selected features with an electronic service tool. Set the parameters and features again if necessary. Refer to the OEM service manual. |
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Engine protection fault code(s) inactive |
Refer to Section TF in the Troubleshooting and Repair Manual for CELECT™ |
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Electronic control module (ECM) calibration is malfunctioning |
Verify the ECM calibration is correct. Check the calibration revision history for applicable fixes to the calibration stored in the ECM. Refer to the calibration history spreadsheet Click here to see ecm_calibration_rev_history.xls on QuickServe® Online or the INCAL™ CD-ROM. Compare the calibration stored in the ECM with the engine rating and the Control Parts List (CPL), Bulletin 4021326 or 4021327. If necessary, recalibrate the ECM. Refer to Procedure 019-032 in the Troubleshooting and Repair Manual, CELECT™ |
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Fuel inlet restriction |
Check for fuel inlet restriction. Refer to Procedure 006-020. |
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Fuel drain line restriction |
Check or replace the fuel lines, check valves, or tank vents as needed. Refer to Procedure 006-012. |
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Intake manifold pressure (boost) is below specification |
Refer to Procedure 019-061 in the Troubleshooting and Repair Manual for CELECT™ |
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Coolant temperature sensor is malfunctioning |
Use an electronic service tool to check the coolant temperature sensor. Refer to Procedure 019-019 in the Troubleshooting and Repair Manual for CELECT™ |
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Intake manifold temperature sensor is malfunctioning |
Check the intake manifold temperature sensor. Refer to Procedure 019-059 in the Troubleshooting and Repair Manual for CELECT™ |
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Ambient air pressure sensor is malfunctioning |
Check the ambient air pressure sensor. Refer to Procedure 019-135 in the Troubleshooting and Repair Manual for CELECT™ |
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Throttle position sensor is misadjusted or malfunctioning |
Check throttle position sensor for proper adjustment and operation. Refer to the OEM instructions. |
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Throttle linkage adjustment is not correct |
Check the fuel pump throttle linkage adjustment. Refer to Procedure 005-035. |
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Engine is operating at low ambient temperature |
Check the shutters and engine compartment air. 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 Procedure 010-031. |
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Exhaust system restriction |
Check the exhaust system for any restrictions. Refer to Procedure 011-009. |
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Air intake or exhaust leaks |
Inspect the air intake and exhaust systems for air leaks. Refer to Proedure 010-024. |
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Air in the fuel system |
Check for air in the fuel system. Refer to Procedure 006-003. |
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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 temperature is above specification |
Fill the fuel tanks. Turn off or bypass the fuel heater, if equipped. Refer to the OEM service manual. |
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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 Fuels for Cummins Engines, Bulletin 3379001. |
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Drivetrain is not correctly matched to the engine |
Check for correct gearing and drivetrain components. Make sure the propeller size is correct. |
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Intake manifold pressure (boost) is below specification |
Refer to the Intake Manifold Pressure (Boost) is Below Normal symptom tree. |
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Fuel supply line restriction between the fuel pump and the injectors |
Check the fuel supply line from the fuel pump to the cylinder head for sharp bends that can cause restrictions. Refer to Procedure 005-060. |
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Engine is operating above recommended altitude |
Engine power decreases above recommended altitude. Refer to the Engine Data Sheet for specifications. |
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Engine is operating above recommended altitude |
Derate the engine by four percent for every 300 meters [1000 feet] of altitude above 3000 m [10,000 ft]. Refer to the OEM service manual. |
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PT fuel pump AFC operation is malfunctioning or pump is not calibrated correctly |
Remove the PT® fuel pump and check the calibration. Check the AFC for proper operation. Refer to the PT Fuel Pump Rebuild and Calibration Manual, Bulletin 3379084. |
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Injector calibration is not correct |
Calibrate the injectors. Refer to Procedure 006-026. |
