What the kill switch function does
This function gives the Nexus a controlled way to stop the engine. It's useful for race cars that need a driver-accessible shutdown, and for strategies where the ECU itself should stop the engine when something specific happens.
Trigger Mode
| Mode | How it works | Typical use |
|---|---|---|
| Wired Input | A physical switch connected to an ECU input shuts the engine down | A dash or steering wheel kill button |
| Conditionally Triggered | The ECU stops the engine when channel conditions you set are met | Automatic shutdown on a specific event |
Stop and reset conditions
Stop Condition only appears with Conditionally Triggered selected. This is where you define what triggers the shutdown, using the same channel-and-comparison logic found throughout NSP.
Reset Condition decides what has to happen before the engine is allowed to run again. Think carefully about this. A reset that clears too easily can let the engine restart before the problem is dealt with, and one that's too strict can leave you stranded.
This is an ECU function. Most racing rules still require a proper battery isolator that cuts power independently of the ECU. Use the function alongside it, not instead of it.
Setup tips
- For a wired switch, see kill switch wiring to assign the input.
- Test the shutdown and reset in the garage before relying on them.
- Related power-side functions include the engine control relay and start motor wiring.
