Cummins Fault Code
Free · no signupSPN 132 FMI 2
Black Smoke / Engine Sags
System
Air Intake
Symptom
Black Smoke / Engine Sags
Diagnosis & fix steps
LOGIC: Mass Air Flow Sensor Implausible Data / Out of Calibration.
ACTION: Clean MAF sensor grid with dedicated electronics cleaner. Check for air intake ducting splits between the air cleaner housing and turbocharger inlet elbow.
Red Seal field insights
Mass Flow Math: The ECM detects a disagreement between calculated mass airflow (based on engine RPM, boost, and charge temp) and the physical voltage/frequency output of the MAF sensor.
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