94-95 MS3X VVT Output Wiring via Factory Harness
 

So I’m getting my MS3X-equipped ‘95 ready for a VVT swap and I thought yesterday I’d start figuring out the output wiring from the ECU to control the VVT.

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Looked at the MS3X wiring diagram on Trubokitty. My VVT output wire on the ECU is labeled nitrous but is in the same location. Did a bunch of searches on here and couldn’t find anything on where the wire terminates. Decided to just chase the wire since I could see the green wire from the ECU corresponded with a yellow/green wire in the OEM harness.

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Ended up tracing the wire to the pressure control regulating valve that sits between the vacuum lines going from the intake manifold to fuel pressure regulator, right next to where the VVT solenoid would be on a newer motor.


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Went into Output Control on TunerStudio and boom we were in business. Was able to toggle ground at the connector.

Maybe I missed it but I was kinda surprised I couldn’t find any documentation on this, since the ECU uses the factory wiring for other add-on components too. Are they all like this or is mine just built different?