[miesk5]

Yo ctandc,
Scan Tool Won’t Initiate Self-Test Due to a Poor Ground.

by jermil01

Check Engine Light (CEL) comes on when the electronic engine control system is not working properly. The check engine warning indicator comes on briefly when the ignition switch lock cylinder is turned to ON, and should turn off when the engine starts. If the check engine warning indicator does not come on when the ignition switch lock cylinder is turned to ON or if it comes on while the vehicle is moving, the system is malfunctioning
If the CEL does not light up at all when starting it; then suspect that bulb is burnt-out or loose, socket was damaged by PO or shop, etc. or someone in tge hood removed it😎.

 

[miesk5]

Yo,
Sometimes, I have seen corroded terminals on the EEC CONNECTOR.

 

[miesk5]

Yo ct,
Man, that's a lot!

Consider G7 Computers @ How Does This Work?
Member gedebohls wrote, " i went with sending my ecu to G7 computers in Canandaigua, NY, the reason i went this way is because i send them my unit, i get my unit checked out 100% and they will then fix as needed. I like this bc I will know for sure if my ECU is or was bad, etc, and I get my ECU back fixed. the cost is $225 plus shipping one way, if nothing is wrong with my ECU i get 100% refund. Once i get my ECU back or get an update from G7 I will update."
Update; "I sent the EEC to be rebuilt by G7 computer and they quickly sent the EEC back saying they replaced a faulty resistor. When the EEC came back I still had the same issues with the bronco , and we spent a lot of time re testing and checking things to only determine that the only possible issue was a bad EEC, so back to G7 Computer. This time they determined a faulty Main processing chip, and stated that the damage was too extensive to replace the main chip, I get it; it is a computer sometimes it is hard to pin point an issue when it is intermittent. My question is; is it just not cost smart for a company like G7 to not want to replace the main chip, or can you just not replace the main chip? So in short G7 sent the EEC back to me and will credit $225 of the $250 saying they get a diagnostic fee of $25, which I also get , "Well sort of get". "