ECMLink's output controls provide a means of defining parameters that activate any one of a few solenoid outputs on the ECU.

These outputs are all switches to ground. That is to say when active, that ECU pin will be connected to ground. When not active, it floats.

But that ground connection is *not* sufficient to directly drive a high pressure solenoid. You must use a relay and, preferably, a master arm switch between the ECU and the solenoids being driven if you're using large solenoids. Trying to drive the solenoid(s) directly from the ECU will result in damage to the drivers inside the ECU.

ECMLink's output controls can be used for a variety of things. Our users have been far more clever in how they use this feature than we ever imagined. They have used it to control water injection, methanol, blow off valve bypass, and probably a few other things we're not even aware of.

So this page is going to describe the general approach to using solenoid outputs of the ECU to drive a larger solenoid through a relay. The rest is going to be up to you and your particular situation.

Details on the internal functionality of ECMLink's output controls can be found on the nitrous control details page.

First, let's get the ECU pins out of the way. You can get a lot more information on the ECU wiring information page, including pin location and wire colors as well.

For the fuel pressure solenoid output, you'll want pin 57 (white wire) on a 1G ECU and pin 3 (blue with red stripe) on a 2G ECU.

For the EGR solenoid output, you'll want pin 53 (black with yellow stripe) on a 1G ECU and pin 6 (light green with red stripe) on a 2G ECU.

You'll probably use a standard ISO (Bosch) automotive relay. If so, here's the function diagram for this type of relay.

The following lists out the basic usage scenario of this relay.

• Run the ECU output to pin 86 on the relay.
• Run switched power (master switch output) to pin 85 and pin 30 on the relay.
• Run pin 87 to the solenoid and/or secondary relay you want to control

That's about it. Just as an illustration, here's a diagram one of our users put together when he wired up an NX nitrous kit to his 2G.