SPN 1174 FMI 2Chassis
Axle 1 Right Wheel 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 1174 / FMI 2
Category
Chassis
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The wheel temperature sensor is mounted on the axle near the right wheel hub assembly on the first axle.
Common Symptoms
- ABS warning lamp illuminated
- Intermittent ABS fault codes
- Wheel temperature reading fluctuates erratically
- ABS system may disable intermittently
- Fault occurs during operation or after wheel heating
Root Causes
- Damaged or corroded wheel temperature sensor wiring harness Faulty wheel temperature sensor Intermittent sensor connector contact Water intrusion in sensor or connector Worn or damaged wheel bearing causing sensor air gap issues
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Derate Behavior
Power Derate
No
System Interactions
SPN 1174 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.
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OEM System Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1174 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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