my ses light popped on and im trying to check it but the obdII port seems to not have any power.but the cig lighter works, and i dont have my manual for my truck, its at home and im at work trying to fix it at work. all we have here that will read my truck is a old NGS. anyone tell me where the fuse is located? i know that its not in the box on the drivers side of the dash.

 

it should be the same one as your Cig lighter... check all the fuses under the hood and the one under your dash..

 

Check both the cig lighter fuse and the accessory fuse as well. My buddy's '99 just had the same exact problem this week. Got a check engine light and tried to scan it and no go.
No power to the cig lighter but the fuse was good. Found it was the accessory fuse that was blown.

 

I belive you want to check pin #16 for power. Maybe someone else will chime in and say if I am right. If I am right then pin 16 needs power inorder for the scan tool to comunicate.

 

I Checked The Cig Lighter Fuse Already And It Was Good, Im Fixin To Go Again With My Test Light

 

Ya, good idea run down through all the fuses and check the ones under the hood too just to make sure all of them are good.

 

https://www.performancetrucks.net/fo...d.php?t=373444

 

thats good info, thanks for chimeing in!

 

alright well pin 16 has power , and i tried the same NGS on my buddys 00' silvy and it had the same problem, so i think its the NGs and not my truck. .. but i also have another question......if your trucks check engine light comes on, it goes into a "limp" mode correct? in which the pcm uses set parameters to go by and only uses the sensors it has to....or does it just ues a set parameter on the sesnor that goes bad???