International · Actual Engine Percent TorqueHigh

International SPN 513 FMI 3: Actual Engine Percent Torque Above Normal

SPN 513 FMI 3 (FMI 3) — Actual engine percent torque signal voltage above normal — the calculated torque value transmitted over J1939 has exceeded its upper data range. No physical torque sensor exists; this is a calculated broadcast parameter.

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Quick Answer

SPN 513 FMI 3 on an International does not involve a physical torque sensor — none exists. The fault means the ECM-calculated torque broadcast exceeds the J1939 data range. Check ECM calibration, injector trim codes, and CAN bus integrity.

Overview: International SPN 513 FMI 3

International SPN 513 FMI 3 flags the Actual Engine Percent Torque calculated value as exceeding its upper normal range on the J1939 data bus. SPN 513 is a critical detail: it is a calculated and broadcast parameter — the ECM computes engine torque from fueling, timing, and RPM data, then shares it on J1939 for use by the transmission controller, instrument cluster, and telematics module. There is no physical torque sensor anywhere on the engine or drivetrain that maps to SPN 513. FMI 3 in the context of a calculated parameter indicates the output of the ECM's torque model has gone outside its valid published range, typically from a miscalibrated injector delivering excess fuel, corrupted ECM torque map data, or a CAN data integrity error causing out-of-range values to be received at a subscribing module. Technicians at ProfessionalDieselRepair.com approaching this fault should resist sensor-hunting and focus on ECM software and injector data.

Repair Snapshot

Time

1 - 3 Hours

Difficulty

Advanced

Parts Cost

$0 - $200

Dealer Labor

$400+

Tools Required

  • Texa Diagnostic Tool
  • Jaltest CDG Adapter
  • Digital Multimeter
  • CAN Bus Termination Resistor Tester
  • Laptop with International Service Tool Access

What SPN 513 FMI 3 Means

International SPN 513 FMI 3 is stored when the ECM detects that the Actual Engine Percent Torque (SPN 513) value has exceeded its upper normal range. It is critical to understand that SPN 513 is a calculated, broadcast parameter — there is no physical torque sensor on the engine. The ECM calculates actual engine torque from fueling rate, injection timing, and engine speed data, then broadcasts the result on the J1939 data bus. FMI 3 (voltage/data above normal) in the context of a calculated parameter indicates the ECM's internal calculation, or the message being received by another module reading this broadcast, has produced a value outside the valid range. On International MaxxForce and A26 engines, this is most often caused by a miscalibration in injector data, a corrupted ECM dataset, or a CAN bus data corruption event rather than any sensor hardware failure.

Symptoms Drivers Notice

  • Engine derate with reduced fueling and power output.
  • Instrument cluster or fleet management system reporting torque values outside expected range.
  • SPN 513 FMI 3 logged alongside other data validity or injector calibration codes.
  • Transmission controller fault codes if the transmission relies on SPN 513 for shift strategy.
  • Possible rough idle or fueling anomaly if injector calibration data is the root cause.

Most Likely Root Causes

ECM software calibration error or out-of-date firmware

Common

Older International ECM calibrations contain torque model boundary errors corrected in later software releases. An above-range torque calculation is produced when the engine operates at a fuel and speed combination outside the calibration map's valid zone.

Over-fueling injector driving calculated torque above normal

Occasional

An injector delivering more fuel than commanded — due to a worn tip or maxed-out positive trim — raises the ECM's torque calculation above the normal range, triggering FMI 3.

J1939 CAN data corruption or framing error

Occasional

A CAN bus fault (damaged harness, bad termination, or module glitch) can cause the SPN 513 message to arrive at a subscribing module with a corrupted value exceeding the valid range, logging FMI 3 at the receiving module.

Common Misdiagnoses (Don't Waste Parts)

Searching for and attempting to replace a non-existent torque sensor

Why it happens: The fault code mentions a 'torque signal' and technicians unfamiliar with J1939 broadcast parameters attempt to locate a physical sensor.

Do this instead: Recognize SPN 513 as a calculated J1939 parameter. There is no sensor — investigate ECM software and data integrity.

Parts-cannon injector replacement based on SPN 513 FMI 3 alone

Why it happens: Technicians assume a torque-related fault must involve fuel delivery and replace injectors without verifying trim codes or performing a fuel contribution test.

Do this instead: Use Texa or Jaltest to read injector trim (IQA) values. Only replace an injector if its trim is at the positive correction limit and a fuel contribution test confirms over-fueling.

Clearing the fault without addressing ECM calibration version

Why it happens: The fault clears and the technician assumes the repair is complete, but the calibration defect causes the fault to recur under similar operating conditions.

Do this instead: Check the ECM calibration version against the latest available International service bulletin before releasing the vehicle.

Master Tech Commentary

Mechanic's Notes

The most common mistake with SPN 513 FMI 3 on an International is attempting to locate a physical torque sensor — none exists. At ProfessionalDieselRepair.com we emphasize that SPN 513 is a J1939-broadcast calculated value. FMI 3 in this context almost always points to software, calibration, or CAN data integrity issues. Technicians who understand J1939 protocol recognize that a calculated PGN exceeding its data range is an ECM-level event, not a sensor failure. Use Texa or Jaltest to check the injector trim values and ECM calibration version first. If injector trims are maxed out, perform a fuel system performance test to find the over-fueling injector. ECM reprogramming resolves a large proportion of SPN 513 FMI 3 faults on International A26 engines without any parts expenditure.

Step-by-Step Diagnostic Procedure

  1. Step 1: Connect a Texa or Jaltest diagnostic tool to the International diagnostic port and read all active fault codes. Identify any companion codes — particularly injector calibration codes (SPN 651–658 series), ECM communication faults, or J1939 data range faults that appeared at the same time as SPN 513 FMI 3.
  2. Step 2: Verify that the ECM software calibration is current using Texa or Jaltest. International service bulletins occasionally release calibration updates that correct out-of-range calculated torque values caused by map boundary errors in earlier software revisions.
  3. Step 3: Check the J1939 CAN bus integrity by measuring termination resistance (expected: ~60 Ω between CAN-H and CAN-L with both terminators installed) and inspecting all backbone connectors for moisture or pin damage. CAN data corruption can cause calculated broadcast values to exceed valid range.
  4. Step 4: Review injector trim codes (IQA codes) stored in the ECM. If any injector trim is at maximum positive correction, the ECM is over-fueling that cylinder, and the resulting calculated torque may exceed normal range. Compare injector trim values to the specification limit.
  5. Step 5: If all hardware checks are normal and the fault recurs, perform an ECM reprogramming using the latest OEM calibration file provided by Navistar/International to reset any corrupted calculation parameters.

Live Data & Freeze-Frame Tips

In Texa or Jaltest live data, monitor SPN 513 (Actual Engine Percent Torque) versus SPN 512 (Driver Demand Percent Torque) at various throttle positions. The two values should track closely at steady state — a calculated actual torque significantly higher than driver demand at the same speed suggests an over-fueling condition. Also monitor individual injector trim values; trims approaching the maximum positive correction limit confirm a contributing injector.

Safety Warnings

  • ECM reprogramming requires a stable power supply — use a battery maintainer to prevent voltage drop that could corrupt the ECM flash process.
  • Do not reprogram the ECM while the engine is running or the truck is connected to a trailer with active electrical loads.
  • Keep calibration backup files stored securely before any ECM reprogramming in case a rollback is required.
  • After any injector replacement or trim code reset, verify fueling balance with a contribution test before returning the vehicle to full-load operation.

When to Limp In vs Tow

Tow the vehicle if the derate associated with SPN 513 FMI 3 has reduced power to an unsafe operating level, or if companion injector faults indicate fuel delivery that is beyond safe correction range.

Prevention Tips for Fleets & Owner-Operators

  • Keep the ECM calibration current with International's latest service calibrations to address known calculation boundary errors.
  • Monitor injector trim codes at each PM — trims approaching positive correction limits indicate an injector approaching end of service life.
  • Inspect J1939 backbone connectors and termination resistors during each annual service to prevent CAN data integrity issues.
  • Use only OEM or approved equivalent injectors to ensure fuel delivery characteristics match ECM calibration maps.

Related Fault Codes

SPN 512 FMI 3

Driver demand percent torque above normal — the command-side torque parameter; both may fault together during CAN data integrity events.

SPN 651 FMI 7

Injector cylinder 1 mechanical system fault — an over-fueling injector is a common cause of SPN 513 FMI 3 through its contribution to the calculated torque value.

SPN 1231 FMI 9

J1939 Network #2 abnormal update rate — a CAN communication fault that can produce corrupted SPN 513 data at subscribing modules.

Frequently Asked Questions

What is International SPN 513 FMI 3?

SPN 513 is Actual Engine Percent Torque — a value the ECM calculates and broadcasts on J1939. FMI 3 means this calculated value is above normal range. No physical torque sensor exists.

Is there a torque sensor I need to replace for SPN 513 FMI 3?

No. SPN 513 is a calculated broadcast parameter. There is no physical torque sensor on International diesel engines. Diagnosis involves ECM calibration and data bus integrity, not sensor replacement.

What causes SPN 513 FMI 3 on an International?

The most common cause is an outdated ECM calibration with a torque map boundary error. Other causes include an over-fueling injector with maxed-out positive trim, or J1939 CAN bus data corruption.

Will ECM reprogramming fix SPN 513 FMI 3?

In many cases, yes. If the fault is caused by a calibration map error, updating to the latest International ECM calibration resolves the fault without any parts replacement.

Can the transmission be affected by SPN 513 FMI 3?

Yes. Automatic transmissions use SPN 513 torque data for shift strategy. An above-range torque value can cause abnormal shift behavior or transmission fault codes in addition to the engine derate.

How much does it cost to fix International SPN 513 FMI 3?

If an ECM calibration update resolves the fault, the cost is $200–$400 for dealer reprogramming labor. If an over-fueling injector is confirmed, injector replacement adds $300–$600 per injector.