ECU reset?

[dawkid]

ok ,so before I go buy a new ECU, is there way to reset it?, I'm hoping to then be able to pull codes for a "lean" condition.
thank you.

 

[fixizin]

Disconnect the neg. battery cable for a few minutes, have your OBD-II reader connected when you re-connect the battery, and you should see at least a code indicating the PCM reset/re-boot. (Ford calls it a PCM=Powertrain Control Module, not ECU.)

Your PCM will now have to "re-learn" some parameters, which can take up to 10 miles of driving around at various RPMs and vacuum loads.

I recently had a lean conditon (code P0401, insufficient EGR flow), and it turned out to be the DPFE sensor, an easy and cheap fix. Cleared up a LOT of symptoms.

Good news: The Ford EEC-V PCM found on the Ranger rarely goes bad. Don't go buying a new one yet. If your truck runs at all, the PCM is not high on the list of suspects. (OOPS, just noticed you have a '93, that's the EEC-IV, and OBD-I codes... not so sure of my advice now... )

Good luck.

 

[shadetree]

If you disconnect the battery, it will erase the KAM codes, and the computer will have to re-learn the problems and set new codes. You can read any codes that are in there now without resetting. Do you have a check engine light? If you do, many auto parts stores will read the codes for free, or if you want to do it yourself, go to the top of the page in the tech section for instructions on how to do it yourself. If the engine runs, and performs other functions, the computer would be the last thing to suspect. shady