John Deere Engines SPN974FMI3 Fault Code: Remote Analog Throttle Signal Out of Range High
Remote Analog Throttle Signal Out of Range High · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 974 FMI 3 means the ECU sees a remote analog throttle signal voltage that corresponds to a throttle position higher than what is physically possible. The engine controller flags it as a Warning and drops throttle to 0% until the signal is valid again. This code is closely tied to SPN 3513 FMI 3, which is checked in the same troubleshooting sequence.
Medium severity. This is logged as a Warning alarm level, not a shutdown-level fault. However, the ECU forces throttle to 0% when it's active, which can stop machine work and, depending on the recovery mode configured, cause unexpected changes in engine speed once the fault clears. Diagnose it before it interferes with a shift, especially on machines that rely on remote throttle for PTO or work functions.
What does John Deere Engines error code SPN974FMI3 mean?
SPN 974 FMI 3 is set when the remote analog throttle signal voltage arriving at the ECU represents a throttle position that is higher than the sensor is physically capable of producing. In other words, the ECU is seeing a voltage that's out of the valid high range for that circuit.
This is an out-of-range-high fault on an analog input circuit, similar in nature to many analog sensor faults. Because it's a signal validity problem rather than a mechanical throttle failure, the root cause is almost always in the wiring, connectors, sensor, or ECU configuration rather than the physical throttle mechanism itself.
On OEM applications, the remote analog throttle is configured in the ECU on a Trim page. If that trim configuration is wrong, it can cause this fault code even when the wiring and sensor are fine, so software configuration should be checked alongside the physical circuit.
Common causes of SPN974FMI3
- Bad terminals or connector at the remote analog throttle connector
- Bad terminals or connector at the ECU
- Open or shorted harness between the remote analog throttle connector and the ECU
- Bad terminals or connector at the X5020 connector
- Bad ECU software
- Bad remote analog throttle sensor
- Bad ECU
- Open in the return wire
- Mispin in the harness
- Incorrect Trim page configuration for the remote analog throttle in OEM applications
How to troubleshoot John Deere Engines SPN974FMI3: first checks
- With ignition on, confirm the fault is active before doing further diagnosis, since this code is only displayed under that condition.
- Inspect the remote analog throttle connector and its terminals for corrosion, looseness, or damage.
- Inspect the ECU connector and terminals, and the X5020 connector where applicable, for the same issues.
- Check the wiring harness between the remote analog throttle and the ECU for opens or shorts, including the return wire.
- Verify the ECU's Trim page configuration for the remote analog throttle is set correctly for the OEM application.
- Test the remote analog throttle sensor itself for proper output across its range.
- If wiring, connectors, sensor, and configuration all check out, consider ECU software or ECU hardware as the remaining possibilities.
How the code clears
No separate clearing step is listed beyond restoring a valid signal. Once the out-of-range condition is corrected, throttle recovery depends on which control unit response mode is configured. In Idle Recovery (the default), the throttle position must be returned to slow idle (0% throttle) after the signal becomes valid again for normal operation to resume. In Resume Recovery, normal throttle operation resumes automatically as soon as the out-of-range condition clears, which can cause large jumps in engine speed if the fault is intermittent. In Locked Recovery, normal throttle operation only resumes once the signal is valid again and power has been cycled on the ECU.
Frequently asked questions
What does SPN 974 FMI 3 mean on a John Deere engine?
It means the ECU has detected that the remote analog throttle signal voltage corresponds to a throttle position higher than what the throttle can physically produce. The ECU treats this as an out-of-range-high signal fault.
Will SPN 974 FMI 3 shut down the engine?
No. It's logged as a Warning alarm level. The ECU sets throttle to 0% while the fault is active, but it does not force an engine shutdown.
Why does my engine speed jump around after this fault clears?
If the machine is configured for Resume Recovery, normal throttle operation resumes automatically as soon as the out-of-range condition clears. If the fault is intermittent, this can cause large jumps in engine speed, which is why Idle Recovery is the default response.
Do I need to cycle power to fix this fault?
It depends on the configured recovery mode. In Locked Recovery, normal throttle operation only resumes after the signal becomes valid again and power is cycled on the ECU. In Idle Recovery, you instead need to return the throttle to slow idle position after the signal is valid.
Is SPN 974 FMI 3 related to SPN 3513 FMI 3?
Yes. Both codes are checked in the same troubleshooting sequence, and diagnosing SPN 974 FMI 3 should include checking SPN 3513 FMI 3 as part of the same procedure.
Could a software setting cause this fault instead of a wiring problem?
Yes. On OEM applications the remote analog throttle is configured on the ECU's Trim page. If that configuration is incorrect, it can trigger this fault code even if the wiring and sensor are working properly.
What parts are most likely to cause this fault?
Bad terminals or connectors at the remote analog throttle connector, the ECU, or the X5020 connector, an open or shorted harness, a bad remote analog throttle sensor, incorrect ECU software, or a bad ECU are all listed as possible causes.