John Deere Engines SPN3513FMI4 Fault Code: Sensor Supply #5 Voltage Out of Range Low
Also called Engine Shutdown Commanded by Application
Sensor Supply #5 Voltage Out of Range Low · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 3513 FMI 4 sets when the ECU detects Sensor Supply #5 voltage below 4.6 volts. This 5-volt supply feeds optional devices like the secondary analog throttle, remote throttle, A/C high-pressure switch, and isochronous/droop governor switch. The alarm level is Warning, and the ECU tries to maintain proper operating conditions while the fault is active.
Medium severity. This code is logged as a Warning-level alarm, not an immediate shutdown. The ECU attempts to keep operating normally, but a low sensor supply can cause affected optional devices (throttle inputs, governor switch, A/C pressure switch) to read incorrectly or stop working, which can affect engine response or accessory function. Diagnose it within the shift rather than ignoring it.
What does John Deere Engines error code SPN3513FMI4 mean?
SPN 3513 FMI 4 points to the ECU's Sensor Supply #5 circuit, a 5-volt reference supply the ECU sends out to power certain optional sensors and switches. When the ECU measures this supply voltage below 4.6 volts while the ignition is on, it logs this fault.
Depending on the machine's configuration, Sensor Supply #5 can feed the secondary analog throttle, remote throttle, A/C high-pressure switch, and isochronous/droop governor switch, all of which are optional and may not all be present on every application. Other application-specific devices may also share this circuit, so check the application technical manual for the full list on a given machine.
The ECU's response is simply to try to maintain proper operating conditions. It does not force an engine shutdown for this fault by itself, but any device relying on that 5-volt reference can behave erratically or stop functioning while the voltage is out of range.
What triggers a John Deere Engines SPN3513FMI4 code?
The ECU sets this code when it detects a Sensor Supply #5 voltage below 4.6 volts, and the fault is active while the ignition is on.
Common causes of SPN3513FMI4
- Bad terminals or connector at the secondary analog throttle, remote throttle, A/C high-pressure switch, or isochronous/droop governor switch (whichever are equipped)
- Short to ground in the wiring harness, or an open in the harness on some variants
- Bad or outdated ECU software
- Bad terminals or connector at the ECU itself, or a bad ECU connector connection
- Faulty component: bad secondary analog throttle, bad remote throttle, bad A/C high-pressure switch, or bad isochronous/droop governor switch
- Bad ECU
- Too many devices connected to this sensor supply, or a bad auxiliary connector overloading the circuit
How to troubleshoot John Deere Engines SPN3513FMI4: first checks
- Before diving into wiring, confirm how many optional devices are actually wired to Sensor Supply #5 on this machine. If too many devices are tied into the circuit, the combined load can trip the ECU's current limit and shut the supply down, mimicking a wiring fault.
- Inspect connectors and terminals at each device that uses this supply (secondary analog throttle, remote throttle, A/C high-pressure switch, isochronous/droop governor switch) for corrosion, looseness, or pushed-out pins.
- Check the ECU connector and its terminals for corrosion or damage, since a bad connection at the ECU end can drop the supply just as easily as a bad connection at the sensor end.
- Inspect the harness between the ECU and each device for a short to ground or, on some setups, an open circuit, especially at chafe points or connectors exposed to moisture and vibration.
- Verify ECU software is current, since outdated or bad ECU software is listed as a possible cause.
- If none of the optional devices listed are actually installed on this machine, check the application technical manual for other application-specific devices that may share this same sensor supply circuit.
How the code clears
No separate clearing step is listed. Since this is an active-fault code tied to ignition-on conditions, once the Sensor Supply #5 voltage is restored above the fault threshold and the underlying wiring, connector, or component issue is corrected, the code should stop being active. Confirm with a scan tool that the fault is no longer current after repairs.
Frequently asked questions
What does SPN 3513 FMI 4 mean on a John Deere engine?
It means the ECU detected the voltage on its Sensor Supply #5 circuit drop below 4.6 volts while the ignition was on. This 5-volt supply feeds optional devices like the secondary analog throttle, remote throttle, A/C high-pressure switch, and isochronous/droop governor switch.
Is SPN 3513 FMI 4 a serious fault?
It's logged at Warning alarm level, and the ECU tries to keep operating normally. It's not an automatic shutdown code, but any optional device relying on that voltage supply may stop working correctly, so it should be diagnosed promptly.
Can too many accessories cause this code?
Yes. The diagnostic information specifically warns that if too many devices are connected to Sensor Supply #5, the combined load can be too great and the ECU will activate a current limit shutdown on that supply, which sets this code.
Which components use Sensor Supply #5?
Depending on the machine and its options, this circuit can power the secondary analog throttle, remote throttle, A/C high-pressure switch, and isochronous/droop governor switch. Other application-specific devices may also be wired into it, so check the application technical manual for the full list.
What's the difference between SPN 3513 FMI 3 and FMI 4?
Both codes follow the same troubleshooting sequence and relate to the Sensor Supply #5 circuit voltage being out of range. FMI 4 specifically covers voltage detected below 4.6 volts (low), while FMI 3 is referenced as part of the same diagnostic sequence for the supply circuit.
Will updating ECU software fix this code?
Outdated or bad ECU software is listed as one of the possible causes, so a software update can be part of the fix, but it should be checked alongside connectors, harness wiring, and the individual components on the circuit.
Does this code shut down the engine?
The description references 'Engine Shutdown Commanded by Application' as a possible label, but the alarm level for this code is Warning and the ECU's listed response is simply trying to maintain proper operating conditions, not a forced shutdown by itself.