Symptom Tree t066
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Read the fault codes with an electronic service tool. Refer to Section TF for fault code troubleshooting. |
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Fuel level is low in the tank |
Fill the supply tank. Refer to the OEM manual. |
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Air in the fuel system |
Check for air in the fuel system. Refer to Procedure 006-003 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Fuel inlet restriction |
Check for fuel inlet restriction. Refer to Procedure 006-020 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Fuel drain line restriction |
Check the fuel drain lines for restriction. Refer to Procedure 006-012 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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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 the appropriate electronic service tool manual and Procedure 019-032. |
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Injector check valve leaking |
Perform the Injector Check Valve Leak Test, repair or replace the injectors as necessary. Refer to Procedure 006-026 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Fuel pump is malfunctioning |
Check the fuel pump output pressure, pulsation damper, and pressure regulator. Replace the fuel pump if necessary. Refer to Procedure 005-016 and 005-031 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Engine position sensor (EPS) or circuit is malfunctioning |
Check the engine position sensor and circuit. Refer to Procedure 019-038. |
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Vehicle speed sensor (VSS) or circuit is malfunctioning |
Check the vehicle speed sensor and circuit. Refer to Procedure 019-090 and 019-091. |
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Idling with excessive load |
Use the PTO feature for loaded conditions at low engine speeds. Refer to the Operation and Maintenance Manual, Bulletin 3666251. |
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Moisture in the wiring harness connectors |
Dry the connectors with Cummins electronic cleaner, Part Number 3824510. |
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Alternator is malfunctioning |
Temporarily disconnect the alternator and run the engine. Replace the alternator if necessary. Refer to the OEM service manual. |
