Cummins ISX11.9 CM2250 – Service Manual Intake Manifold Air Temperature Above Specification

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Fault Code Troubleshooting Manual, Bulletin
4022225, for fault code troubleshooting information.

Intake manifold temperature sensor is malfunctioning

Check the intake manifold temperature sensor. Refer to
Procedure 019-159 in Section 19
.

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 Section 1 in the Operation and Maintenance Manual, ISX11.9 CM2250, Bulletin 2883444.

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 Procedure 010-027 in Section 10,
Procedure 008-042 in Section 8, and the OEM service manual.

Fan drive belt is loose

Check the belt tension and tighten if necessary.

Fan drive or fan controls are malfunctioning

Check the fan drive and controls. Refer to
Procedure 008-027 in Section 8
.

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, as necessary. Refer to Procedure 008-038 in Section 8 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 in Section 8
.

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 in Section 11
.

Intake air or exhaust leaks

Refer to Procedure 010-024 and
Procedure 010-057 in Section 10.

EGR differential pressure sensor leaking

Check the EGR differential pressure sensor mounting for leaks. Refer to Procedure 011-066 in Section 11,
Procedure 019-370 in Section 19, and the Engine Performance Troubleshooting Tree in Section TT.

EGR differential pressure sensor tubes leaking

Check the tubes for leaks. Refer to Procedure 011-027 in Section 11 and the Engine Performance Troubleshooting Tree in Section TT.