ECU? Will PR3 work on 90 LS/VTEC

ASSISTANCE Hybrids & Advanced Aftermarket Engine Performance
1

Does anyone know if the PR3 ecu plug straight up to a 90 LS? And will it activate the VTEC appropriately?

Thanks.

2

Yep…it will plug right in. You just need to add the two wires for the vtec selonoid and pressure switch. I believe they are A8 and B5…its been a while so you might want to double check. Also a knock sensor if its a stock ecu. HTH

Ryan

3

Check it out-
If your PR3 ECU has a LED on the cover,
then yes.

If it has no LED on it than no because its a OBD1 PR3
for 92-95 vessels only.

HTH-

4

Thanks guys. It is stock, so will need to hook up knock sensor. And it does not have led, as well, the connections do not look like OBD-I, so it is an 89-91 PR3.

5

Hey, im confused.
I thought all 88-91’s had the led on the cover.
Is it a jdm ecu and they dont have that? wtf?

Someone clear me up on this.

6

Mine is a JDM pr3 and it has an LED. I’m not to sure about the ones that don’t. I have yet to see a non obd ecu without the LED.

Ryan

7

Confusing, where is the led on the cover? In relation to the connectors, is it close or on the other side, etc…?

8

If you lay the ecu flat as it would be in your car, the LED is near the top in the middle. Didn’t the stock ecu have one? It should be in the same place as the stock one. HTH

Ryan