M11 Series Engines – Engine Speed Surges Under Load or in Operating Range

Symptom Tree  t067

This is symptom tree t067
Cause Correction

Electronic fault codes active or high counts of inactive fault codes

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

 

Fuel inlet restriction

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

 

Air in the fuel system

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

 

Fuel level is low in the tank

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

 

Fuel drain line restriction

Check the fuel drain lines for restriction. Clear or replace the fuel lines, check valves, or tank vents as necessary. Refer to Procedure 006-012.

 

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 for CELECT™ Plus Systems, Bulletin 3666130, or in the Troubleshooting and Repair Manual for CELECT™
Systems, Bulletin 3666084.

 

Accelerator pedal or lever is worn or failed (CELECT™ or CELECT™ Plus)

Inspect the accelerator pedal or lever for correct operation. Check the accelerator pedal position sensor and circuit. Refer to Procedures 019-085 and 019-086 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Cruise control/PTO selector switch or circuit is malfunctioning

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

 

Engine position sensor (EPS) or circuit is malfunctioning

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

 

Vehicle speed sensor (VSS) or circuit is malfunctioning

Check the vehicle speed sensor and circuit. Refer to Procedures 019-090, 019-091, and 019-093 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Injector is malfunctioning

Perform the single-cylinder cutout test. Replace the injectors as necessary. Refer to Procedures 006-005 and 006-026.

 

Fuel pump pulsation damper is cracked

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

 

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

Adjust the automotive and VS idle speeds. Refer to Procedures 005-028 and 005-029.

 

PT fuel pump calibration is not correct

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

 

Camshaft end clearance is excessive

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

 
Last Modified:  14-Jan-2004