# microRusEFI

## Buy here

[rusEFI store](https://www.shop.rusefi.com/shop)

microRusEFI is a highly integrated board version of the rusEFI ECU. The microRusEFI ECU is targeted at port-injected
gasoline engines up to 4 cylinders.

[Connector Pinout](Hardware-microRusEFI-wiring)

[Latest Schematics](https://github.com/rusefi/hw_microRusEfi/blob/master/microRusEfi_Schematic.pdf)

[Forum Thread](https://rusefi.com/forum/viewtopic.php?f=4&t=1538)

[Board Source Files](https://github.com/rusefi/hw_microRusEfi)

## Capabilities

* Primary VR or Hall input (configurable with few resistor changes)
* Secondary Hall input
* x4 analog thermistor (temperature) inputs
* x10 analog voltage inputs (0-5v)
* x4 high-Z injector outputs
* x2 high-current low side outputs for IAC/VVT/other solenoids
* Dedicated main relay control output
* x4 low-current low side outputs for relays or warning lights
* x4 5v logic level ignition outputs
* x2 5v/12v configurable logic level outputs (requires resistor changes)
* Electronic throttle body (drive by wire)
* CAN connectivity on the plug
* USB connectivity on the plug

[Connector Pinout](Hardware-microRusEFI-wiring)

Main Relay Wiring:

![wiring diagram](https://user-images.githubusercontent.com/48498823/90672739-94b7e080-e224-11ea-92fb-12a4fdc5b056.png)

![microRusEFI image](https://user-images.githubusercontent.com/5051341/80747087-806e9d00-8ae8-11ea-983e-330dfc6e3015.jpg)
![microRusEFI image](https://user-images.githubusercontent.com/5051341/80747096-849aba80-8ae8-11ea-862c-d124ef75f06a.jpg)

## FAQ

Q: How about 6 cylinders sequential on microRusEFI?

A: The microRusEFI ECU is primarily a 4 cylinder ECU. At this time the testing for safety, reliable control, and consistency have not been completed for running the microRusEFI ECU on a 6 cylinder engine. This is something that we are working on and could be added at a future point.
See [https://github.com/rusefi/hw_microRusEfi/issues/203](https://github.com/rusefi/hw_microRusEfi/issues/203)

Q: what about stepper idle?

A: yes microRusEFI can drive 4 wire idle air valves see setting at https://github.com/rusefi/rusefi/pull/3749

[See also Kit Instructions](Hardware-microRusEFI-kit-instructions)