M11 Series Engines – Engine Power Output Low (CELECT™ or CELECT™ Plus)

Symptom Tree  t057-155

This is symptom tree t057-155
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.

 

Interview the operator to verify the complaint

Refer to Driveability – General Information, the Driveability/Low Power Customer Complaint Form, and the Driveability Checklist at the end of Section TS. Follow the instructions on the forms before continuing with this tree.

 

Electronic control module system is not calibrated or has incorrect calibration

Compare the calibration in the electronic control system with the engine rating and the Control Parts List (CPL), Bulletin 3379133 or 4021327. If necessary, calibrate the system. Refer to the appropriate electronic service tool manual and Procedure 019-032 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

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 appropriate electronic service tool manual and Procedure 019-078 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Drivetrain is not correctly matched to the engine

Check for correct gearing and drivetrain components. Refer to the OEM vehicle specifications.

 

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 Procedures 007-009 and 007-025.

 

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 Fuel for Cummins Engines, Bulletin 3379001 and the OEM service manual.

 

Air intake or exhaust leaks

Inspect the air intake and exhaust systems for air leaks. Refer to Procedure 010-024.

 

Fuel inlet temperature to pump is above specification

Fill the fuel tank, turn off or bypass the fuel heaters, and check the fuel cooler. Refer to the OEM service manuals.

 

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.

 

Intake manifold air temperature is above specification

Refer to the Intake Manifold Air Temperature Above Specification symptom tree.

 

Charge air cooler is restricted or leaking

Inspect the charge air cooler for air restrictions or leaks. Refer to Procedure 010-027.

 

Intake manifold pressure (boost) is below specification

Refer to the Intake Manifold Pressure (Boost) is Below Normal symptom tree.

 

Throttle position sensor or circuit malfunctioning (if equipped with a throttle position sensor)

Check the throttle 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 the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Tachometer or speedometer is not calibrated or is malfunctioning

Compare the vehicle tachometer and speedometer readings with an electronic service tool reading. Check the calibration values for the flywheel teeth, rear axle ratio, and tire revolutions. Adjust the values if necessary. Refer to the appropriate electronic service tool manual. Calibrate or replace the tachometer or speedometer as necessary. Refer to the OEM service manuals.

 

Engine is operating above recommended altitude

Engine power decreases above recommended altitude. Refer to the Engine Data Sheet for specifications.

 

Engine protection fault code(s) inactive

View the fault codes and the engine protection data with an electronic service tool. Refer to the appropriate electronic service tool manual. Refer to the corresponding fault code in Section TF 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.

 

Vehicle speed sensor (VSS) or circuit is malfunctioning

Use an electronic service tool to monitor the vehicle speed while the vehicle is not moving. Refer to the appropriate electronic service tool manual. If the monitor shows speed, check the 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.

 

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

 

Coolant temperature sensor is malfunctioning

Use an electronic service tool to check the coolant temperature sensor circuit. Refer to Procedure 019-019 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Ambient air pressure sensor is malfunctioning (if equipped)

Check the ambient air pressure sensor. Refer to Procedure 019-004 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Intake manifold pressure sensor is malfunctioning

Check the intake manifold pressure sensor. Refer to Procedure 019-061 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

 

Governor setting is not correct in the programmable parameters

Verify if the driver is accustomed to the automotive governor or the VS governor. Change the governor setting if necessary. Refer to the appropriate electronic service tool manual.

 

Fuel supply pressure is below specification

Measure the fuel supply pressure. Refer to Procedure 005-011.

 

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 006-020.

 

Turbocharger wheel clearance is out of specification

Check the radial bearing clearance and axial clearance. Inspect the turbocharger. Repair or replace the turbocharger if necessary. Refer to Procedures 010-038 and 010-047.

 

Engine components are not correct

Compare the Control Parts List (CPL) to the engine components. Replace components that do not meet CPL requirements. Refer to Control Parts List, Bulletin No. 3379133.

 

Overhead adjustments are not correct

Adjust the overhead settings. Refer to Procedure 003-004.

 

Crankcase pressure is excessive

Check for excessive blowby. Refer to Section 14. Refer to the Crankcase Gases (Blowby) Excessive symptom tree.

 

Engine is operating at high ambient temperature

Use outside air to the turbocharger in hot weather.

 

Engine is operating at low ambient temperature

Check the winterfront, shutters, and under-the-hood air. Use under-the-hood intake air in cold weather. Refer to Operation of Diesel Engine in Cold Climates, Bulletin 3379009 and the Operation and Maintenance Manual.

 

Fuel temperature is above specification

Fill the fuel tanks. Turn off or bypass the fuel heater, if equipped. Refer to the OEM service manual.

 

Fuel drillings in the cylinder head are plugged

Check for a plastic fuel passage plug blocking the fuel supply to the injectors. Refer to Procedure 002-004.

 

Load is excessive for engine horsepower rating

Reduce the load on the engine. Refer to Operating the Engine in the Operation and Maintenance Manual.

 
Last Modified:  28-Mar-2005