John Deere Engines SPN190FMI14 Fault Code: Engine Speed/Pump Speed Out of Sync
Engine Speed/Pump Speed Out of Sync · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 190 FMI 14 sets when either the engine speed sensor or the pump speed sensor stops reporting a signal while the other sensor is still reading normally. The ECU falls back to whichever sensor still works, so the engine usually keeps running, sometimes with a brief hesitation.
Medium severity. The engine typically keeps running because the ECU switches to the backup speed input, but losing one of the two speed references removes redundancy and should be diagnosed promptly before the second sensor or the ECU itself develops a problem.
What does John Deere Engines error code SPN190FMI14 mean?
This code compares two speed signals inside the engine: the engine speed sensor mounted in the timing gear cover, which reads teeth on the camshaft drive gear, and the pump speed sensor located inside the injection pump, which reads notches on the pump timing wheel. Both are inductive pickup sensors that generate an AC signal whose frequency rises and falls with engine speed.
The ECU treats the engine speed sensor as its primary input and the pump speed sensor as a backup. SPN 190 FMI 14 sets when one of these two sensors goes quiet, meaning it reports no speed at all, while the other sensor is still reporting a normal reading. In other words, the two signals disagree because one has dropped out entirely.
If the engine speed sensor is the one that failed, the engine may hesitate momentarily while the ECU switches over to the pump speed sensor input, but it should keep running normally afterward. If the pump speed sensor is the one that failed, there should be no noticeable change in how the engine runs since the primary engine speed sensor is still doing its job.
Common causes of SPN190FMI14
- Dirt, damage, or poorly seated terminals on the ECU 30-way connector, the pump 6-way connector, or the engine speed sensor connector
- Faulty pump speed sensor inside the injection pump
- Open circuit in the pump speed input wire
- Open circuit in the pump speed ground wire
- Faulty pump speed wiring harness
- Faulty engine speed sensor
- Bad ECU
How to troubleshoot John Deere Engines SPN190FMI14: first checks
- Inspect the ECU 30-way connector, the pump 6-way connector, and the engine speed sensor connector for dirt, corrosion, damaged pins, or terminals that are not fully seated
- Use the JT07328 Connector Adapter Test Kit to probe connector circuits rather than forcing test probes directly into the terminals, which can damage them and create a new fault
- Check the pump speed input wire and pump speed ground wire for open circuits or chafing along the harness routing
- Inspect the pump speed wiring harness as a whole for pinch points, rubbed-through insulation, or connector backout
- Test the pump speed sensor inside the injection pump and the engine speed sensor for correct operation, replacing whichever one is confirmed faulty
- If wiring, connectors, and both sensors check out good, suspect the ECU itself
How the code clears
No separate clearing step is listed. Repair the connector, wiring, or sensor fault that is causing one signal to drop out, then verify the code does not return during a normal duty cycle. If the ECU is replaced, standard programming and configuration steps for that engine should be followed.
Frequently asked questions
What does John Deere fault code SPN 190 FMI 14 mean?
It means the ECU is seeing a valid speed signal from either the engine speed sensor or the pump speed sensor, but not from both at the same time. One of the two has stopped reporting a speed reading.
Will the engine shut down when this code sets?
No shutdown is described. The engine should keep running. If the fault is on the engine speed sensor side, you may notice a brief hesitation while the ECU switches to the pump speed sensor as its backup input. If the fault is on the pump speed sensor side, there is usually no noticeable change in engine operation.
Where are the engine speed and pump speed sensors located?
The engine speed sensor is mounted in the timing gear cover and reads teeth on the camshaft drive gear. The pump speed sensor is located inside the injection pump and reads notches on the pump timing wheel.
Can I just probe the connector with a multimeter to test this?
Do not force probes into the connector terminals, this can damage them and create additional faults. Use the JT07328 Connector Adapter Test Kit to safely make measurements in the connector circuits.
What usually causes SPN 190 FMI 14?
Common causes include dirty, damaged, or poorly positioned terminals on the ECU 30-way connector, the pump 6-way connector, or the engine speed sensor connector, a faulty pump speed sensor, an open in the pump speed input or ground wire, a faulty pump speed wiring harness, a faulty engine speed sensor, or a bad ECU.
Is this the same as a total loss of engine speed signal?
No. This code specifically requires that one sensor is still reading normally while the other reports nothing. If both sensors failed at once, the ECU behavior described here for FMI 14 would not apply the same way.