SPN 132 FMI 2Air Intake
Engine Intake Air Temperature - Erratic/Intermittent
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 132 / FMI 2
Category
Air Intake
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The intake air temperature sensor is typically mounted in the intake air duct between the air filter and turbocharger inlet.
Common Symptoms
- Check engine light illuminated
- Engine derate or reduced power
- Poor fuel economy
- Rough idle or hesitation
- Black smoke under acceleration
- Hard starting in cold weather
Root Causes
- Damaged or corroded wiring harness to intake air temperature sensor Faulty intake air temperature sensor with intermittent internal failure Loose or corroded connector at intake air temperature sensor Water or moisture intrusion in sensor connector Chafed wiring causing intermittent short or open circuit
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Derate Behavior
Power Derate
No
System Interactions
SPN 132 FMI 2 interacts with the following systems and may trigger cascading faults if not resolved promptly.
Common Diagnostic Mistakes
Replacing the sensor without verifying wiring continuity and supply voltage first.
Clearing codes without identifying and resolving the root cause — the fault will return.
Ignoring related active faults — cascading faults often share a root cause.
Skipping the connector inspection — corrosion and damaged pins are a leading cause of sensor faults.
Condemning the ECM before exhausting all wiring and component tests.
Related Faults in This Category
OEM System Resources
ASE Training Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 132 FMI 2 — Full FSM Sequence & Repair Steps — includes wiring notes, sensor specs, and gated repair procedures.
Authority References
Diagnostic procedures on this page are informed by OEM service literature and industry standards.
Cummins QuickServe OnlineOfficial Cummins service manuals, fault code lookup, and TSB database.Detroit Diesel DiagnoCentralDetroit Diesel diagnostic procedures, DDDL documentation, and service literature.PACCAR MX Engine ServicePACCAR MX-11 and MX-13 engine service documentation and DAVIE diagnostic guides.Volvo/Mack Tech ToolVolvo and Mack engine fault code reference and PTT/Tech Tool diagnostic procedures.ASE — Diesel Truck Technician CertificationNational Institute for Automotive Service Excellence — T2 Diesel Engines certification standards.EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.
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