Wiring the Coyote ECU

Hey Guys,

We know that a lot of folks are using the Coyote crate engine in their builds so we just put up a new post on our blog that shows you in detail how to wire that into any of our Infinitywire systems. This includes a detailed wiring diagram.

Wiring the ECU with an Infinitywire 10 or 20-Circuit Harness Kit is a breeze. Ford did a great job designing this wiring harness and made everything simple. There are only a few wires off of their FRPDB (Ford Racing Power Distribution Box) that you need to connect to MASTERCELL inputs and POWERCELL outputs.

The advantage of wiring the ECU into the Infintywire system is that POWERCELLs become the relays for the system. This means that you can power the cooling fan off of the front POWERCELL and the fuel pump off of the rear POWERCELL. You're running less wire through the car.
Before you go anywhere with this wiring job, familiarize yourself with the instructions from Ford on the engine harness and ECU. You can download this manual at by clicking this link.

We created a simple wiring diagram that shows you the connections between the Ford Coyote ECU and the Infinitywire system.

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There are 5 key connections between the Ford harness and the Infinitywire system. Please refer to the configuration sheet that came with your Infinitywire kit for the exact wire colors that connect into your system. Depending on which kit you have, these colors will be different. If you don't have your configuration sheet, you can download it from our Reference Section at this link or you can contact our technical support team.

Blunt Lead 1 (Red/Light Green wire) gets connected to the ignition output on your front POWERCELL.

Blunt Lead 2 (Dark Green) is the fuel pump trigger from the ECU. It is active when the ECU has ignition power. This is a positive trigger coming out of the ECU. You need to convert it to a ground trigger to safely connect it to the MASTERCELL input. You can do that with a relay. See this link for details. Or, you can use one of our inVERT Minis to do this easily.

Blunt Lead 3 (Red/Light Blue wire) gets connected to the starter output on your POWERCELL. This is a trigger for the ECU so that it can adjust the timing for starting the engine. You need to tap off the feed to the starter solenoid.

Blunt Lead 4 (Dark Blue/Orange wire) goes to the clutch interlock or neutral switch depending on the type of transmission. Both the ECU and the Infinitywire system need to know that it is safe to start the car. Connect the MASTERCELL neutral safety input to a switch on your transmission or your clutch pedal. This switch should have a connection to ground when it is safe to start the engine: either the clutch pedal is pressed or the transmission is in neutral. You need to connect the Blunt Lead 4 wire from the Ford harness to this same switch but the MASTERCELL input needs to be isolated by a diode from this wire. Install a 1N4001 diode, with the stripe facing the safety switch on the MASTERCELL input wire. You can purchase this diode from Radio Shack by clicking this link.

There is cooling fan lug under the cover of the FRPDB. This is the cooling fan trigger. Just like the fuel pump trigger, it puts out a positive trigger to turn on the fan. You need to flip this to a ground trigger to connect it to the MASTERCELL. You can do that with a relay. See this link for details. Or, you can use one of our inVERT Minis to do this easily.

Blunt Lead 5 is the tach signal. It does not connect to your Infinitywire system. This is going to connect to your tachometer.

Otherwise connect the main feed to the Power Distribution Box to the battery and connect the grounds as noted in the Ford manual. That is it for the connections between Infinitywire System and the engine harness.

You can download a PDF of the wiring diagram for this install by clicking this link.

Contact our technical service team with more questions on how to wire this, or any other ECU into your car with the Infinitywire System.