Centinel System – Repair Manual – Intake Manifold Air Temperature Above Specification

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334, or Troubleshooting and Repair Manual, Electronic Control System, Signature, ISX and QSX15 Engines, Bulletin 3666259, or Troubleshooting and Repair Manual, Power Generation Control Systems QSX15, QSK23, QSK45, QSK60, QSK78, and QST30 Series Engines, Bulletin 4021419.

Intake manifold temperature sensor is malfunctioning

Check the intake manifold temperature sensor. Refer to Procedure 019-159 in the Troubleshooting and Repair Manual, Electronic Control System, Signature, ISX and QSX15 Engines, Bulletin 3666259, or Procedure 019-059 in Troubleshooting and Repair Manual, Power Generation Control Systems QSX15, QSK23, QSK45, QSK60, QSK78, and QST30 Series Engines, Bulletin 4021419 or Procedure 019-059 in Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334.

Cold weather radiator cover or winterfront is closed

Open the cold weather radiator cover or the winterfront. Maintain a minimum of 784 cm² [122 in²] or approximately 28 x 28 cm [11 x 11 in] of opening at all times. Refer to Procedure 101-015 in the Operation and Maintenance Manual, Signature and ISX Engines, Bulletin 3666251 or Procedure 101-015 Operation and Maintenance Manual, Industrial and Power Generation, QSX15 Engines, Bulletin 3666423.

Charge air cooler fins, radiator fins, or air conditioner condenser fins are damaged or obstructed with debris

Inspect the charge air cooler, air conditioner condenser, and radiator fins. Clean, if necessary. Refer to Procedures 010-027, 008-042 and the OEM service manual.

Fan drive belt is loose

Check the belt tension and tighten if necessary. Refer to Procedure 008-003.

Fan drive or fan controls are malfunctioning

Check the fan drive and controls. Refer to Procedure 008-027.

Fan shroud is damaged or missing or the air recirculation baffles are damaged or missing

Inspect the shroud and the recirculation baffles. Repair, replace, or install, if necessary. Refer to Procedure 008-038 and the OEM service manual.

Radiator shutters are not opening completely, or the shutterstat setting is wrong

Inspect the radiator shutters. Repair or replace if necessary. Check the shutterstat setting. Refer to Procedure 008-049.

Fan is not an adequate size for the application

Verify that the fan is the correct size. Refer to the OEM service manual.

EGR cooler malfunctioning

Check the EGR cooler. Refer to Procedure 011-019.

Intake air or exhaust leaks

Refer to Procedures 010-024, 010-057, or the Engine Performance Troubleshooting in Section TT.

EGR differential pressure sensor leaking

Check the EGR differential pressure sensor mounting for leaks. Refer to Procedure 011-028, Engine Performance Troubleshooting in Section TT, and Procedure 019-370 in Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334.

EGR differential pressure sensor tubes leaking

Check the tubes for leaks. Refer to Procedure 011-026 and Engine Performance Troubleshooting in Section TT.