Engine Starts But Will Not AccelerateThis is symptom tree t071

Cause CorrectionSTEP 1

Electronic fault codes active or high counts ofinactive fault codes

............. Refer to Section TF for fault code troubleshooting.

OKGo To Next Step

STEP 2Fuel inlet restriction .............

Check for fuel inlet restriction. Refer to Procedure006-020 in Section 6 in the N14 Base Engine(STC, Celect™, Celect Plus™) Service Manual,Bulletin 4310591; or Procedure 006-020 in Section6 in the M11 (STC, CELECT™, CELECT Plus™Models) Troubleshooting and Repair Manual,Bulletin 3666139; Procedure 5-18 in theTroubleshooting and Repair Manual, L10 EngineExternal Damper Models, Bulletin 3810439;Procedure 006-020 in Section 6 in the K19 ServiceManual, Bulletin 4021499; or Procedure 006-020in Section 6 in the K38, K50, QSK38, and QSK50Service Manual, Bulletin 4021528.

OKGo To Next Step

STEP 3EFC valve is malfunctioning ............. Check the EFC valve for sticking or leakage. Refer

to Procedure 019-102 in Section 19.

OKGo To Next Step

STEP 4Intake air restricted .............

Inspect and change the air cleaner element filter.Look for other restrictions. Refer to Procedure010-031 in Section 10 in the N14 Base Engine(STC, Celect™, Celect Plus™) Service Manual,Bulletin 4310591; or Procedure 010-031 in Section10 in the M11 (STC, CELECT™, CELECT Plus™Models) Troubleshooting and Repair Manual,Bulletin 3666139; Procedure 3-03 in theTroubleshooting and Repair Manual, L10 EngineExternal Damper Models, Bulletin 3810439;Procedure 010-031 in Section 10 in the K19Service Manual, Bulletin 4021499; or Procedure010-031 in Section 10 in the K38, K50, QSK38,and QSK50 Service Manual, Bulletin 4021528.

OKGo To Next Step

Engine Starts But Will Not AccelerateThis is symptom tree t071

Cause Correction

STEP 5Exhaust system restriction .............

Check the exhaust system for restrictions. Refer toProcedure 011-009 in Section 10 in the N14 BaseEngine (STC, Celect™, Celect Plus™) ServiceManual, Bulletin 4310591; or Procedure 011-009in Section 10 in the M11 (STC, CELECT™,CELECT Plus™ Models) Troubleshooting andRepair Manual, Bulletin 3666139; Procedure 3-04in the Troubleshooting and Repair Manual, L10Engine External Damper Models, Bulletin3810439; Procedure 011-009 in Section 10 in theK19 Service Manual, Bulletin 4021499; orProcedure 011-009 in Section 10 in the K38, K50,QSK38, and QSK50 Service Manual, Bulletin4021528.

OKGo To Next Step

STEP 6Air in the fuel system .............

Check for air in the fuel system. Refer toProcedure 006-003 in Section 6 in the N14 BaseEngine (STC, Celect™, Celect Plus™) ServiceManual, Bulletin 4310591; or Procedure 006-003in Section 6 in the M11 (STC, CELECT™,CELECT Plus™ Models) Troubleshooting andRepair Manual, Bulletin 3666139; Procedure 5-16in the Troubleshooting and Repair Manual, L10Engine External Damper Models, Bulletin3810439; Procedure 006-003 in Section 6 in theK19 Service Manual, Bulletin 4021499; andProcedure 006-003 in Section 6 in the K38, K50,QSK38, and QSK50 Service Manual, Bulletin4021528.

OKGo To Next Step

STEP 7Throttle malfunctioning ............. Check the throttle signal. Repair or replace the

throttle. Refer to Procedure 019-085 in Section 19.

OKGo To Next Step

STEP 8Engine control module (ECM) calibration is

malfunctioning.............

Verify the ECM calibration is correct. Check thecalibration revision history for applicable fixes tothe calibration stored in the ECM. Refer to thecalibration history spreadsheet on QuickServe™Online or the INCAL™ calibration CD-ROM.Compare the calibration stored in the ECM withthe engine rating and the Control Parts List (CPL),Bulletin 4021326 or 4021327. If necessary,calibrate the ECM. Refer to the appropriateelectronic service tool manual and Procedure019-032 in Section 19.

OKGo To Next Step

Engine Starts But Will Not AccelerateThis is symptom tree t071

Cause Correction

STEP 9Fuel pressure sensor is malfunctioning .............

Check the fuel supply lines from the fuel pump tothe cylinder head for sharp bends that can causerestrictions.

OKGo To Next Step

STEP 10Fuel pump is malfunctioning .............

Check the fuel pump output pressure, pulsationdamper, and pressure regulator. Replace the fuelpump, if necessary. Refer to Procedure 005-016 inSection 5 in the N14 Base Engine (STC, Celect™,Celect Plus™) Service Manual, Bulletin 4310591;or Procedure 005-016 in Section 5 in the M11(STC, CELECT™, CELECT Plus™ Models)Troubleshooting and Repair Manual, Bulletin3666139; Procedure 5-02 in the Troubleshootingand Repair Manual, L10 Engine External DamperModels, Bulletin 3810439; or Procedure 005-016 inSection 5 in the K19 Service Manual, Bulletin4021499; or Procedure 005-016 in Section 5 in theK38, K50, QSK38, and QSK50 Service Manual,Bulletin 4021528.

OKGo To Next Step

STEP 11Injectors are not correct .............

Remove the injectors and compare the partnumbers to the Control Parts List (CPL), Bulletin4021328. Replace the injectors, if necessary.Refer to Procedure 006-026 in Section 6 in theN14 Base Engine (STC, Celect™, Celect Plus™)Service Manual, Bulletin 4310591; or Procedure006-026 in Section 6 in the M11 (STC, CELECT™,CELECT Plus™ Models) Troubleshooting andRepair Manual, Bulletin 3666139; Procedure 5-10in the Troubleshooting and Repair Manual, L10Engine External Damper Models, Bulletin3810439; or Procedure 006-026 in Section 6 in theK19 Service Manual, Bulletin 4021499; orProcedure 006-026 in Section 6 in the K38, K50,QSK38, and QSK50 Service Manual, Bulletin4021528.