2. Extract the bundle and launch the rusEFI console. Hit the "Install Drivers" button to install the Virtual Com Port and DFU drivers. If necessary the bundle will also help you install java run-time.
5. Start a new project, save to a folder that you specify, and choose the rusefi.ini file from the bundle. Or, even simpler, use 'Detect' button and let TunerStudio download .ini from the internet!
1. Install [TunerStudio](HOWTO-create-tunerstudio-project#download-and-install) and [MegaLog Viewer](https://www.efianalytics.com/MegaLogViewer/download/) (the payed versions are highly recommended).
*Most PnP rusEFI units can be powered through the USB port. So you can set it up in the comfort of your living room and have it communicate with Tunerstudio before it is installed in the car. It is highly recommended to try this approach.
3. Connect TunerStudio to your ECU. You will need a USB cable to establish communication between your tuning laptop and the rusEFI unit. There will be a USB port on a PnP unit.
**Your laptop should give you an audible notification when you plug in the ECU with the ignition turned on. That means that it "sees" a new device connected to a USB port.**
5. With this your TunerStudio screen should come to life! You should see sensor inputs and some output values like ignition timing and dwell. Of course the values displayed might not make a lot of sense, since your ECU is lacking a car, but at least you can see that TunerStudio and your computer are communicating.
Assuming the pre-requisites for sensors as [outlined here](HOWTO-Start-An-Engine#sensor-requirements) are met,
your TunerStudio screen should come to life!
You should see sensor inputs and some output values like ignition timing and dwell.
If things are set up properly, you should see reasonable values for:
* Coolant temperature (CLT)
* Intake Air temperature (IAT)
* Battery Voltage (BV)
* Manifold Air Pressure (MAP/MAF) (should be near 100kpa if you're using a MAP sensor)
* Throttle Position Sensor (TPS)
The values may show some jitters. RPMs should be 0. Push your throttle pedal and see if you get a response. Congratulations- your rusEFI can "see" your car.
Calibrate your throttle pedal. Go to "Tools" -> "Calibrate TPS". Don't touch the throttle and click on "Get Current" next to "Closed Throttle ADC count". Now step on the throttle pedal (full-throttle/pedal fully depressed) **and** do the same for no-throttle (pedal fully released).
Test your outputs. Under "Controller" -> "Bench Test & Commands" you can see a lot of options for outputs you can test. Let's focus on the basic ones for now. Spark and Fuel. First, if your car's fuel pump is controlled by the ECU, test "Fuel Pump". You should hear the fuel pump running.
Then move on to spark. Here it depends on how your car is set up. If you have a 4-cylinder with wasted spark (which is likely the majority of users), you will likely be using "Spark #1" and "Spark #3". When you click the test button, you should hear the corresponding ignition coil firing. If you can't hear the spark, you may want to pull a spark plug (or use a spare) and hook it up to the spark plug connector and ground it. Test again and you should see a spark arcing. Don't shock yourself.
Now it's time to test your injectors. Again, this depends on your vehicle. Most cars will at least have two banks of injectors. So you should definitely hear injectors firing when you're testing "Injector #1" and "Injector #2". If you have full-sequential fuel, you should try as many injectors as your engine has cylinders. *Fuel is flammable. Have a fire extinguisher near by just in case.
That's the basic outputs tested. With this you should be able to get the engine to run. You can go ahead and test the other outputs as well. Like Check Engine Light. Engine-Fan, AC, AC-Fan etc.
Turn the ignition off and unplug the USB cable. This removes power to the unit- (just to make sure we're in a defined state). Then reconnect the USB cable, turn on the ignition, wait for TunerStudio to come to life and then crank the engine. You should see the RPMs jump to a positive value (typical would be anywhere between 200 and 600rpm) and your engine should start. It may take a few cranks for RPMs to register. If you see RPMs in Tunerstudio, but the engine isn't starting, keep at it. It may take quite a bit longer than the stock ECU. You are probably used to cranking taking approx. 2s or so. **rusEFI takes about 2s of cranking before it can identify the position of the crankshaft. And then it will fire the injectors and ignition coils.** It may take it quite a while (>10s which seems like an eternity when cranking) for the engine to catch. Don't give up. There may be coughs and sputters. Play with the throttle a little. It will start eventually. Post your findings to the [forum](https://rusefi.com/forum/) and we can help!
Q: Is there anything special I need to do to wire USB from ECU harness?
A: The USB Cable needs to be shielded all the way to the connector. Don't connect the shield at the ECU end. There should be exactly one ground from laptop to ECU, and it needs to be in the USB cable, no splices.
A: rusEFI does not write to internal flash memory while your engine is running. In order to really write the values into the permanent memory you would need to stop the engine (or disconnect your stimulator). Online tuning is not affected by this issue - you can still tune and the new values would be applied right away, they just would not be saved until you stop the engine.
A: For most of the pinout changes to be applied you need to reset rusEFI. Do not forget to stop the engine so that the new config is saved into internal memory!
