Sensors & outputs Expansion
rusEFI Purple gateway
CAN / USB bridge · sensor · Expansion
A CAN gateway sits on the Race Core CAN bus and speaks to a laptop or to another controller. The Core EFI shop lists a Pico-based purple gateway for CAN bridging and USB. That is not the same object as the rusEFI wiki Purple Gateway, which is a 26-pin Superseal module aimed at an OEM transmission controller.
Typical parts: Pico-based purple CAN / USB gateway. The wiki Superseal gateway (harness side 3-1437290-8) is a different device.
Warning — Do not copy the 26-pin Superseal map onto the Pico board. Superseal cavity numbers for the TCU gateway are a different product. Read the silkscreen on the board in your hand.
Device pinout
Race Core only has two published CAN 1 pins. The gateway’s own screw terminals or pads are labelled on that board.
- Connector: CAN and USB on the gateway. Race Core side is CAN 1.
- Layout: CAN H and CAN L as marked on the board
| Device pin | Function | Type | Race Core | TunerStudio |
|---|---|---|---|---|
| CAN H | CAN high | Signal | B17 | CAN 1 H |
| CAN L | CAN low | Signal | B16 | CAN 1 L |
| USB | Laptop | — | Not an AMPSEAL pin | Host side of the gateway |
Wiring notes
- CAN 1 on Race Core is 1 Mbit/s in this library. The gateway has to be set to the same bitrate or the bus stays quiet.
- Twisted pair, short stubs. One termination at each physical end of the bus. A third terminator in the middle of a short car harness makes a bus that almost works.
- CAN ground is the ECU power ground, common with the gateway ground. Do not invent a third “CAN ground” pin on the AMPSEAL.
- USB on the gateway is the laptop link. USB-C on the Race Core case is the ECU’s own serial port. They are not substitutes for each other.
- The gateway does not create extra analog inputs. Sensors still land on the analog, thermistor, VR, and digital pins in the other notes.
Failure modes
- No CAN traffic: H and L swapped, bitrate mismatch, or two nodes both terminated and a third terminator hidden in a dash.
- Bus errors the moment the engine cranks: CAN pair routed with the coil wires, or the gateway ground is floating.
- TunerStudio still needs the ECU USB port if the gateway is only a TCU translator. A Pico bridge that is not the ECU will not load a tune by itself.
See also
- Wideband — CAN 1 is also the preferred wideband path when the controller speaks CAN.