M11 Series – Service Manual – Engine Acceleration or Response Poor

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.

Verify the complaint

Test the engine operation while under load. Perform an engine acceleration test. Perform an engine load test. Observe the percent load with an electronic service tool. Refer to the Driveability/Low Power – Customer Complaint Form.

Perform a throttle response test (if applicable)

Perform a throttle response test. Refer to Response Test – CELECT™ and CELECT™ Plus.

Perform a stall speed test (if applicable)

Perform a stall speed test. Refer to Procedure 005-054.

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 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.

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 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.

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 Section TF in the Troubleshooting and Repair Manaul for CELECT™ Systems, Bulletin 3666084.

Fuel inlet restriction

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

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.

Intake manifold pressure (boost) sensor or circuit is malfunctioning

Check the boost sensor and circuit. Refer to Procedures 019-061 and 019-062 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or Procedure 3-04 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. Refer to Procedure 019-019 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or Procedure 3-04 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 Procedure 3-04 in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

Ambient air temperature sensor is malfunctioning (if equipped)

Check the ambient air temperature sensor. Refer to Procedure 019-004 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or Procedure 3-04 in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.

Accelerator pedal or lever is restricted or malfunctioning

Check the percent accelerator pedal or lever reading on an electronic service tool. Verify that it reads 100 percent with the accelerator pedal depressed and 0 percent when released. Check the remote accelerator pedal. Calibrate the accelerator pedal if possible. Refer to the OEM service manual.

Throttle linkage adjustment is not correct

Check the fuel pump throttle linkage adjustment. Refer to Procedure 005-036.

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 Engines in Cold Climates, Bulletin 3379009.

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.

Exhaust system restriction

Check the exhaust system for any restrictions. Refer to Procedure 011-009.

Air intake or exhaust leaks

Visually inspect the air intake and exhaust systems for air leaks. Refer to Procedure 010-024Procedure 011-009.

Air in the fuel system

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

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.

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 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.

Drivetrain is not correctly matched to the engine

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

Intake manifold pressure (boost) is below specification

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

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 006-003.

Engine is operating above recommended altitude (STC engines only)

Derate the engine by 4 percent for every 300 meters [1000 feet] of altitude above 3600 meters [12,000 ft]. Refer to the Engine Data Sheet.

Engine is operating at high ambient temperature

Use outside air to the turbocharger in hot weather.

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 Procedure 005-016 and the PT Fuel Pump Rebuild and Calibration Manual, Bulletin 3379084.

Injector calibration is not correct or the fuel supply to the injector is restricted (PT injectors)

Remove the injectors. Check the injectors for the correct calibration. Check the inlet screen for restriction. Check for carbon buildup on the plungers. Refer to Procedure 006-026 and the Injector Specifications Manual, Bulletin 3379664.