SPN 2400 FMI 0Emissions
Evaporative Emission System Leak Detection Pump Control Circuit Open
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 2400 / FMI 0
Category
Emissions
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The evaporative emission leak detection pump is typically mounted near the fuel tank or under the vehicle chassis in the evaporative system.
Common Symptoms
- Check engine light or MIL illuminated
- Emissions system fault warning displayed
- No drivability issues typically observed
- Fault logged during evaporative system self-test
Root Causes
- Open circuit in leak detection pump wiring harness Faulty leak detection pump motor Corroded or damaged connector at leak detection pump ECM control circuit failure Blown fuse or open relay in pump power supply
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Derate Behavior
Power Derate
No
System Interactions
SPN 2400 FMI 0 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 2400 FMI 0 — 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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