I have a 1989 Toyota pickup and am looking to replace a ECU is one with a 16p compatible with a 18p

 

Welcome!

What ECU are you looking at? What vehicle did that ECU come out of?

Why are you replacing the ECU?

 

My check engine light is constantly on. Took it to the shop and they said that they hooked it up to do a diagnostic and it kept throwing inconsistent results. They said that it has got to be the ECU. Second opinion said ECU and/or mass flow sensor. I figured I’d start with the ECU first, since that’s the easiest to replace. Heee is a picture of my ECU and the one I found on eBay. The second PIN number is slightly off and wasn’t sure if it was compatible.

eBay ECU

ECU out of my truck

 

Both the ECUs have the same part number so they should be the same.

I think what we are seeing for the eBay ECU second connector is that part of the label is rubbed off on the 8 making it look like a 6.

The second connector should have 18 pins for both yours and the eBay ECUs.

 

1. I think old87yota is correct about the number of pins. (while not conclusive, note how the 6's elsewhere on the ECU have a sloped top.)

2. Of all the possible causes of a CEL, a bad ECU is WAY down the list. I doubt that will fix anything. It's also NOT the mass flow sensor -- you don't have one (you have a VAF - volume flow sensor - different technology). So I would try to verify your first and second opinions. First, read the codes! If your shop "hooked it up to do a diagnostic and it kept throwing inconsistent results," it sounds like they didn't know how to read codes. Here's how to do it: http://www.4crawler.com/4x4/CheapTri...Codes/#Reading

Once you have the codes, you have a path to follow to diagnose your problem.