Cummins N14 STC, Celect, Celect Plus – Service Manual Intake Manifold Pressure (Boost) is Below Normal

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the CELECT Plus™ Systems Troubleshooting and Repair Manual, 3666130, or Section TF in the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.

Turbocharger is not correct

Check the turbocharger part number and compare it to the Control Parts List (CPL), Bulletin 3379133 or 4021327. Replace the turbocharger, if necessary. Refer to Procedure 010-033 in Section 10.

Air intake or exhaust leaks

Inspect the air intake and exhaust systems for air leaks. Refer to Procedure 010-024 in Section 10.

Charge-air cooler restricted (if equipped)

Inspect the air cooler for internal and external restrictions. Replace the restricted cooler if necessary. Refer to Procedure 010-027 in Section 10.

Air compressor connection is loose or damaged

Check the connection between the manifold and the air compressor. Repair or replace if necessary.

Air intake system restriction

Check the air intake system for restriction. Refer to Procedure 010-031 in Section 10.

Exhaust system restriction

Check the exhaust system for restrictions. Refer to Procedure 011-009 in Section 11.

Turbocharger is worn or damaged

Check the turbocharger for damage. Measure the turbine and compressor wheel clearances. Refer to Procedure 010-039 in Section 10.

Engine power output is low

Refer to the Engine Power Output Low troubleshooting symptom tree in Section TS.