i.have a 86 iroc z28 and I have a misfire in my engine I got plugs and that comming but I decided to test the computer for any codes
bought a little gadget on ammazon and pluged it in
instead of a code it turns in my radiator fan it's electronic not mechanical and I get no codes i checked to see if the bulb under the dash was good and it is
tryed the paper clip trick same results

I'm honestly confused at this
it's not a problem right now but down the road I'd like to be able to use the computer for diagnostic purposes any help whould be appreciated

 

Does the mil illuminate koeo ? Btw normal
for fan time come on in diagnostic mode

 

no nothing comes on

 

Burned out mil ? Or bad ecm

 

 

I'll look into it it's more of a thing I want to fix before it becomes a problem but it's not priority at the moment I'm neck deep in a 83 celica supra manual transmission swap rn

I'll post a update when I can tinker on the iroc again it may be up to a wheek though