FMI 14 - Active Medium Pressure Fuel Injection Timing Error

The fuel injection system is injecting fuel too late or too early compared to what's normal for the engine's operation, affecting performance and emissions.

The engine control module (ECM) sees an inconsistency between the expected fuel injection timing and the actual timing being executed, often measured in milliseconds.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check for loose or damaged wiring and connectors in the fuel injection circuit. Repair as necessary. Decision: Did you find issues? (Yes: Fix and retest. No: Proceed to step 2.)
2. 22. Measure the fuel pressure using a gauge. It should be within 35-85 psi depending on the engine. Decision: Is fuel pressure within spec? (Yes: Proceed to step 3. No: Address fuel system issues before retesting.)
3. 33. Evaluate the performance of the fuel injectors with a scan tool for injector timing and performance values. Decision: Are injectors functioning correctly? (Yes: Proceed to step 4. No: Replace faulty injectors.)
4. 44. Check ECM for software updates or errors that could cause timing discrepancies. Decision: Is software up to date and error-free? (Yes: Proceed to step 5. No: Update or correct software.)
5. 55. Inspect timing gears or chains for wear or misalignment. Decision: Are timing components in good condition? (Yes: If needed, the issue may be a fault in the ECM. No: Replace worn timing components.)

• Faulty fuel injector
• Wiring issues or bad connectors
• Fuel pressure too low or too high
• ECM software issues
• Timing gear or chain problems

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