M11 Industrial Operation and Maintenance – Engine Difficult to Start or Will Not Start (Exhaust Smoke)

Symptom Tree  

Electronic fault codes are active

For instructions on how to read active fault codes, refer to Procedure 101-007 (Electronic Controlled Fuel System) in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility.


Battery voltage is low

Check the batteries and the unswitched battery supply circuit. Refer to the OEM service manual.


Engine-driven units are engaged

Disengage engine-driven units.


Engine cranking speed is too slow

If the cranking speed is slower than 150 rpm, refer to the Engine Will Not Crank or Cranks Slowly symptom tree.


Fuel shutoff valve(s) closed (electronically controlled injection)

Check the fuel shutoff valve and circuit. Contact a Cummins Authorized Repair Facility.


Fuse(s) malfunctioning

Replace the fuse(s) in the OEM interface harness.


Exhaust system restriction

Check the exhaust system for any restrictions. Refer to Procedure 018-020 (Exhaust System Specifications) in Section V.


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 Procedure 018-002 (Fuel Recommendations and Specifications) in Section V.


Starting aid is necessary for cold weather or starting aid is malfunctioning

Check for the correct operation of the starting aid. Refer to the manufacturer’s instructions. Refer to Procedure 101-015 (Operating the Engine) in Section 1.


Fuel filter or fuel suction line is restricted

Replace the fuel filter. Refer to Procedure 006-015 (Fuel Filter – Spin-on) in Section 4. Check the fuel suction line for restriction Procedure 006-015 (Fuel Filter – Spin-on) in Section 4.


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 010-024 (Air Leaks, Air Intake and Exhaust Systems) in Section 5.

Contact a Cummins Authorized Repair Facility

Last Modified:  18-Nov-2004