Adding an IAT (Intake Air Temp) sensor to my '84 Crossfire Vette and need wiring info help. Getting told to add wires and pins to connector positions C-11 and C-12 but I already have wires and pins there. In fact the only spare connector openings I see are C-1 and C-24. Anyone add an IAT to a HAM board EBL ECM and know the solution? Let me know, thanks.

 

Use black 21 as the IAT input to the ECM. Ground the other terminal on the IAT, no polarity.

RBob.

 

Thank you. Don't know how you stay on top of these posts... Anyway, read a post by Ronny who said pin 14 on black connector could be used if currently unused. To me that's a preferred solution since it's already wired and pinned. Any comment on that?

Noted it's rated at 12 to 14 volts - an issue? C-21 is rated at 5 volts.

 

Going with 21 - will pull 14 pin and move to 21. Or maybe not - if that's an a/c solenoid = no. Was thinking it's an air pump solenoid which I deleted... duh.

 

More - found wire it's not the a/c so it's usable but I also have an EGR delete ( Pin 22) gray wire which is more accessible than #14 so I'll move 22 to 21 on the connector and use it. End of story - will post results in case anyone is following for similar mod...

 

Worked great and an EZ fix. IAT is talking to ECM...