ISM, ISMe, and QSM11 – Engine Decelerates Slowly

Symptom Tree  t041

This is symptom tree t041
Cause Correction

Electronic fault codes active or high counts of inactive fault codes

Read the fault codes with an electronic service tool. Refer to Section TF in the Troubleshooting and Repair Manual Electronic Control System ISM and QSM11 Engines, Bulletin 3666266 and the Troubleshooting and Repair Manual CM870 Electronic Control System ISM Engines, Bulletin 4021381 for fault code troubleshooting.


Accelerator pedal or lever is restricted or malfunctioning

Check the percent throttle reading on an electronic service tool. Verify that it reads 100 percent with the accelerator pedal depressed and 0 percent when released. Calibrate the accelerator if possible. Replace the accelerator if necessary refer to the OEM service manual.


Air in the fuel system

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


Injectors are malfunctioning

Perform the automated cylinder performance test. Use the data to determine if the engine is overfueled. Replace the injectors as necessary. Refer to Procedure 006-026 or 014-002.


Turbocharger oil seal is leaking

Check the turbocharger compressor and turbine seals. Refer to Procedure 010-033.

Last Modified:  08-Jan-2004