John Deere 4940 ECU remapping
10 files available
About remapping
The John Deere 4940 is a self-propelled sprayer and accounts for 10 files in our catalogue, entirely the 9.0 litre diesel block. It is a high-capacity machine for large-scale crop treatment.
Stage 1 makes up 9 files, with 3 EGR off, one DPF off and one Stage 2. The ECU is a single reference across the whole catalogue: L21. In agriculture we always work to conservative criteria, because the engine spends many hours under constant load.
Model highlights
- ›9 Stage 1 files on the 9.0 litre diesel block.
- ›3 EGR off files for maintenance work.
- ›A self-propelled sprayer for large-scale crop treatment.
- ›A single ECU reference across the whole catalogue: L21.
Fuel split
Engines
| 9.0D | Turbo-Diesel | 5 |
| 9.0d | Turbo-Diesel | 3 |
| 9.0 D | 1 | |
| 9.0 L | 1 |
ECUs
ECU manufacturers
Available services
Remapping services
Stage 1
Optimising the original map with no hardware changes: more power and torque, full reliability.
EGR off
EGR valve management to reduce soot issues and improve response.
DPF off
Particulate filter solution: no more regenerations or blockage warnings.
Stage 2
Remap for vehicles with mechanical upgrades (intake, exhaust, intercooler…).
Why remap with Repromatronic
- ✓More power and torque with engine-safe tuning
- ✓Sharper throttle response and nicer driving
- ✓Potential fuel savings in normal driving
- ✓Files built from the original and 100% reversible
- ✓Made by technicians with thousands of projects behind them
Are you a driver?
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Log in as a professionalFrequently asked questions
What do you aim for on a self-propelled sprayer?
Sustained capacity under load during the treatment window, when the machine works long hours with little margin for stoppages.
Is it different from remapping a tractor?
The criteria are similar but the working profile differs. We adjust our approach to how each machine actually works.
Does it affect the machine's warranty?
It may affect the manufacturer's cover. We keep the original file so the work can be reversed if needed.