Electronic Control System Signature, ISX and QSX15 Engines – Engine Difficult to Start or Will Not Start (Exhaust Smoke)

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Symptom Tree  t043

This is symptom tree t043
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 for fault code troubleshooting.

 

Fuel level is low in the tank

Fill the supply tank. Refer to the OEM manual.

 

Battery voltage is low

Check the batteries and the unswitched battery supply circuit. Refer to Procedure 013-009 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239 and 019-087.

 

Engine cranking speed is too slow

Check the engine cranking speed with a handheld tachometer or electronic service tool. If the cranking speed is slower than 150 rpm, refer to the Engine Will Not Crank or Cranks Slowly symptom tree.

 

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 Recommendations and Specifications in the Operation and Maintenance Manual, Bulletin 3666251.

 

Electronic control module (ECM) calibration is malfunctioning

Verify the electronic control module (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 Internet Website or the INCAL™ calibration CD. 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 the appropriate electronic service tool manual and Procedure 019-032.

 

Fuel inlet restriction

Check for fuel inlet restriction. Refer to Procedure 006-020 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Air in the fuel system

Check for air in the fuel system. Refer to Procedure 006-003 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

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 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

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 the Operation and Maintenance Manual, Bulletin 3666251.

 

Fuel lift pump is malfunctioning

Check the fuel lift pump for correct operation. Check the pump output pressure. Replace the lift pump, if necessary. Refer to Procedure 005-045 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Fuel pump is malfunctioning

Check the fuel pump output pressure, pulsation damper, and pressure regulator. Replace the fuel pump if necessary. Refer to Procedure 005-016 and 005-031 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to Procedure 003-004 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Engine brakes are malfunctioning

Check the engine brake operation, adjustment, and solenoid resistance. Repair or adjust as necessary. Refer to Procedure 020-004 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Camshaft timing is not correct

Refer to Procedure 001-088 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Injector o-rings are damaged or missing

Remove and check the injectors. Replace the injector o-rings. Refer to Procedure 006-026 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Exhaust system restriction

Check the exhaust system for any restrictions. Refer to Procedure 011-009 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Vehicle parasitics are excessive

Check for transmission malfunctioning, cooling fan operation cycle time, and engine-driven units. Refer to the OEM service manual.

 

Debris in the fuel passages

Check the fuel tubes and fuel manifold for debris. Refer to Procedure 006-024 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Valve protrusion is below specification

Check the valve protrusion. Replace the valve seat inserts or the cylinder head. Refer to Procedure 002-004 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 

Internal engine damage

Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure 007-002 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239.

 
Last Modified:  22-Nov-2004