Rabbit ECU RT1


The RT1 ECU is comprised of the Rabbit ECU V1.3 PCB, and a Teensy 3.5 controller. This is a basic ECU designed for cable throttle engines that need complex I/O such as relays and PWM control.

Teensy Fuel Injection, Teensy ECU, Arduino ECU, Open Source ECU, Teensy DIY, DIY ECU, DIY EFI

Teensy 3.5

The Teensy project board is powered by the NXP MK64FX512 micro-controller that runs at 120MHz. The ECUHost OS port makes use of a generous 18 individual timers that can be used for injection, ignition or PWM control.

Also, the on-chip programmable gain amplifier features makes it very easy to integrate a wide-band oxygen sensor (LSU4.2 and 4.9 supported) using some additional circuitry on the Rabbit ECU V1.3 PCB.

Aftermarket Fuel Injection


The RT1 ECU has 8 analog inputs, 2 Hall Effect/Optical/Magnetic Reluctor inputs and CAN bus. 4 analog inputs have internal pull-up resistors. One of the remaining analog inputs is reserved for battery voltage measurement.

Software Input Options

The software options for the inputs are:

  • Crank Position Sensor
  • Cam Position Sensor
  • Air Mass Meter (frequency)
  • Air Mass Meter (analog)
  • Coolant Temperature
  • Air Temperature
  • Battery Voltage
  • Throttle Position Sensor
  • Manifold pressure Sensor
  • External Lambda Device Input


The RT1 has 4 saturated injector outputs, 4 x 12V motor driver/igniter signal outputs, 8 relay drivers, 2 x 12V high-side drivers, oxygen sensor heater drive and CAN bus.

Software Output Options

The timed output (injector and motor/igniter) software options are:

  • injection
  • ignition
  • stepper motor drive

The relay and high-side driver output software options are:

  • logic output (e.g. TPS > 70%)
  • thermo-fan relay
  • fuel pump relay


The RT1 Windows software is MAP-MATE found here in source code and installer form.

MDAC MAP-MATE GitHub Project Source Code

MDAC MAP-MATE V1.0.1.26 Setup Password “mdac”

The RT1 Arduino firmware is found here in source code, see firmware below for the hex/bin file.


The latest firmware and accompanying A2L file are as follows:

Teensy Adapter 15032021

You can point MAP-MATE to the correct GUI layout and A2L files in the settings menu.


The Rabbit ECU V1.3 PCB schematic files are as follows:

1. Main PCB
2. Crank Cam Multi Interface
3. Wide Band Oxygen Sensor
4. Injectors
5. Saturated Injector Driver
7. Motor Driver
8. Motors
9. Relay Drivers
10. Relay Driver
11. Analog Inputs
12. High Side Drivers
14. CAN Bus
15. Power

Schematic – Teensy Adapter

Example Installation Wiring

RT1 Example Wiring Diagram

Rabbit ECU Teensy 3.5 DIY EFI DIY ECU

Buy Rabbit ECU RT1

You can purchase the Rabbit ECU Arduino Complete (RT1) kit here at Tindie.


I sell on Tindie