Cummins N14 STC, Celect, Celect Plus – Service Manual Engine Speed Surges Under Load or in Operating Range

Symptom Tree  t067

This is symptom tree
Cause Correction

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or Section TF in the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

 

Fuel inlet restriction

Check for fuel inlet restriction. Refer to Procedure 006-020 in Section 6.

 

Air in the fuel system

Check for air in the fuel system. Refer to Procedure 006-003 in Section 6.

 

Fuel level is low in the tank

Fill the supply tank. Refer to the OEM service manual.

 

Fuel drain line restriction

Check or replace the fuel lines, check valves, or tank vents as needed. Refer to Procedure 006-012 in Section 6.

 

Electronic control module (ECM) calibration is malfunctioning

Verify that the electronic control module (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 on QuickServe™ Online Internet Website or the INCAL™ calibration CD. Compare the calibration stored in the ECM with the engine rating and the Control Parts List (CPL), Bulletin 4021328. If necessary, calibrate the ECM. Refer to Procedure 019-032 in Section 19 of the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

 

Accelerator pedal or lever position sensor or circuit is malfunctioning

Check for foot pedal restriction. Check the accelerator pedal or lever position sensor and circuit. Refer to Procedure 019-085 and Procedure 019-086 in Section 19 of the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or Procedure 019-085 and Procedure 019-086 in Section 19 of the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

 

Cruise control/PTO selector switch or circuit is malfunctioning

Check the cruise control/PTO selector switch and circuit. Refer to Procedure 019-023 and Procedure 019-024 in Section 19 of the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

 

Engine position sensor (EPS) or circuit is malfunctioning

Check the engine position sensor and circuit. Refer to Procedure 019-038 and Procedure 019-039 in Section 19 of the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or Procedure 019-038 and Procedure 019-039 of the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

 

Vehicle speed sensor (VSS) or circuit is malfunctioning

Refer to the appropriate electronic service tool manual. If the monitor shows speed, check the sensor and circuit. Refer to Procedure 019-090, Procedure 019-091, and Procedure 019-093 in Section 19 of the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

 

Injector is malfunctioning

Perform the cylinder performance test. Replace injectors as necessary. Refer to Procedure 006-026 in Section 6.

 

Fuel pump pulsation damper is cracked

Inspect the fuel pump pulsation damper. Replace the pulsation damper if necessary. Refer to Procedure 005-031 in Section 5.

 

Automotive and variable speed (VS) governor idle speeds are set too close (STC engines only)

Adjust the automotive and VS idle speeds. Refer to Procedure 005-028 and Procedure 005-029 in Section 5.

 

PT fuel pump calibration is not correct

Remove the fuel pump. Check the calibration. Refer to Procedure 005-016 in Section 5 and PT™ Fuel Pump Rebuild and Calibration Manual, Bulletin 3379084.

 

PT fuel pump is not assembled correctly

Check the fuel pump for correct assembly and installation. Refer to Procedure 005-016 in Section 5 and PT™ Fuel Pump Rebuild and Calibration Manual, Bulletin 3379084.

 

Camshaft end clearance is excessive

Check the camshaft end clearance. Refer to Procedure 001-065 in Section 1.

 
Last Modified:  18-Jan-2012