engine code 54, been on since swap Options

[RUNNIN-LOW]

well ive been workin on the car and that dame check engine finally is getting to me. i check it out and it comes out to be 54..check it out on alldata and it says something like p1 squib line to p2 squib line.. asking around its something about the air bag?? wiring harness was made by dr.tweak and i am sure i put the engine in right. just cant seem to get rid of the dame code..anyone have a clue help please.

[Silver94CelicaOw...]

I can't see the pics, broken links?


Yeah the Evap plug is just fine if left unplugged, it just connects to a sensor on the ST205's evap canister for emissions. Mine has been unplugged for months now and it runs perfect, no codes.

A Code 54 will pop up if the intercooler water level gets too low, if the water level sensor is bad, or if there is an error with the pump in any way. This will also occur if the pump isn't connected, because the ECU will trigger a Code 54 if the resistance load isn't there from the pump being present. Unless Tweak wired this properly to compensate for the lack of a level sensor or pump, then it will trip a code 54.


In order for your stock 3rd gen ECU to be happy with a FMIC, the two wires for the intercooler water level sensor must be jumped, as well as wiring in the resistors like WannabeGT4 posted for the intercooler pump wiring.
Have Tweak examine how he wired your harness and have him follow the schematic that WannabeGT4 posted....it should be a very easy fix, since not much is needed at all to make the ST205 harness work on a ST204



-Corey