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SPN 513 FMI 3 International A26 — Actual Engine Perce (2026)

SPN 513 FMI 3 on International A26 means 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exists; this is a calculated broadcast parameter.. 60–80% of field cases trace to ecm software calibration error or out-of-date firmware. Shop repair with parts runs $0 - $200; DIY wiring or filter work starts at $40–$150. Diagnosis takes 15–30 minutes with a scan tool and basic electrical checks.

What This Code Means

SPN 513 FMI 3 on International A26 tells the ECM that actual engine percent torque is outside calibrated limits. On J1939, FMI 3 specifies the failure mode: 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.. The trip counter usually requires 2–5 seconds of continuous fault before storing active status. 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.

Common Symptoms

• Engine derate with reduced fueling and power output. (100% of cases)
• Instrument cluster or fleet management system reporting torque values outside expected range. (80% of cases)
• SPN 513 FMI 3 logged alongside other data validity or injector calibration codes. (60% of cases)
• Transmission controller fault codes if the transmission relies on SPN 513 for shift strategy. (40% of cases)
• Possible rough idle or fueling anomaly if injector calibration data is the root cause. (25% of cases)

Likely Causes (Ranked by Probability)

1. ECM software calibration error or out-of-date firmware (45% of cases) — 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.

2. Over-fueling injector driving calculated torque above normal (25% of cases) — 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.

3. J1939 CAN data corruption or framing error (15% of cases) — 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.

Step-by-Step Diagnostic Guide

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. — Tool: scan tool or multimeter. Document readings on the work order.

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. — Tool: scan tool or multimeter. Document readings on the work order.

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. — Tool: scan tool or multimeter. Document readings on the work order.

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. — Tool: scan tool or multimeter. Document readings on the work order.

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. — Tool: scan tool or multimeter. Document readings on the work order.

Repair Options (with Costs)

Repair	DIY	Independent Shop	Dealer
Actual Engine Percent Torque wiring repair	$25–$150	$150–$350	$250–$500
Actual Engine Percent Torque sensor/part	$0 - $200	$$0 - $200 + labor	$400+
Full module replacement	N/A	$600–$1,500	$400+

Platform-Specific Notes

On International A26, this code follows OEM J1939 diagnostic logic. Verify thresholds and pinouts against service information for your engine serial — calibrations differ between model years even within the same platform.

When This Code Sets

SPN 513 FMI 3 sets when actual engine percent torque fails the J1939 rationality monitor for a calibrated trip counter — usually 2–5 seconds continuous on electrical faults, longer on efficiency monitors. Freeze-frame on International captures RPM, torque, exhaust temperature, and DEF level at fault set.

Scan Tool Parameters to Log

• Actual Engine Percent Torque live data PID at idle, cruise, and full load
• Battery voltage and ECM supply voltage
• Related aftertreatment and protection PIDs (SPN 1569 if stacked)

Common Misdiagnoses

Searching for and attempting to replace a non-existent torque sensor — The fault code mentions a ‘torque signal’ and technicians unfamiliar with J1939 broadcast parameters attempt to locate a physical sensor.. 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 — Technicians assume a torque-related fault must involve fuel delivery and replace injectors without verifying trim codes or performing a fuel contribution test.. 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 — The fault clears and the technician assumes the repair is complete, but the calibration defect causes the fault to recur under similar operating conditions.. Instead: Check the ECM calibration version against the latest available International service bulletin before releasing the vehicle.

Shop Notes from the Field

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.

Safety Warning

• 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.

Prevention Tips

• 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 Codes

• SPN 512 FMI 3 — often stacks with SPN 513 FMI 3
• SPN 651 FMI 7 — often stacks with SPN 513 FMI 3
• SPN 1231 FMI 9 — often stacks with SPN 513 FMI 3

FAQ

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.

What does SPN 513 FMI 3 mean on International A26?

SPN 513 FMI 3 means 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.. The ECM detected actual engine percent torque outside calibrated limits. Verify with freeze-frame data before clearing.

Can I drive with SPN 513 FMI 3 active?

Short distances only if power is normal. Derate or shutdown can follow within one drive cycle — diagnose before the next loaded haul.

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

DIY repairs start at $40–$150 for wiring or filters. Shop repairs with parts run $0 - $200. Dealer pricing runs $400+.

What is the most common cause of SPN 513 FMI 3?

ECM software calibration error or out-of-date firmware — confirm with visual inspection and live data before ordering parts.

Sources

• SAE J1939-71 — SPN 513 parameter definition
• International OEM service information — verify by engine serial
• Mitchell1 ProDemand — 2026 labor and parts cost surveys

Related Reading

• International fault codes hub
• Diesel repair cost estimator
• Actual Engine Percent Torque diagnostic guide
• SPN 512 FMI 3
• SPN 651 FMI 7