Just finished my b18a1 ls swap into my 90 hatch, and i'm getting an IAT sensor CEL...

I had to swap back to a stock cluster, before I had a custom cluster that didn't have any of the OEM lights so I have no idea how long this CEL has been on, it could have been on for the past couple swaps I've had. when I first got my car a couple years ago there were no CEL's...

I've tryed 3 different IAT sensors, one was out of a car that didn't have a CEL for IAT sensor too. And it's showing the CEL everytime.

I'm thinking maybe wiring? I checked as far as I can see into the OEM wiring loom and it looks okay but idk. The car also has a obd0-obd1 ecu harness with a stock P75 ecu.

Any ideas? I'm thinking of finding the ECU pinout for the IAT (D15) and just hard-wiring the sensor in like you do for VTEC conversions on non-VTEC wiring harness'... Think that would work? What does the other wire coming from the sensor plug go to, just ground?

 

Check the green/white wire, that is a shared sensor ground wire. Honda used a butt connector for those (iat, Tps, and ect). Chances are it may have broken loose.

 

green/white wire where? at the ecu, or the sensor? thanks

 

At the sensor. The ones I mentioned all share the same green/white ground

 

So what does that mean lol I'm confused. Think i can just run a seperate ground off the sensors plug and run the signal wire to pin d15 on the ecu?

 

All the sensors I mentioned, they all share the same ground.