Code 54 how to fix??

**amnash** · 07-11-2011, 08:29 PM

pulled my ecu for codes and it just flashes code 54 over and over again.
this means Auto signal to ECU.

im not sure what exactly its saying it wrong. is it wiring to the ecu?? the ecu itself?

how can i fix this.
im thinking worst case scenario here..but engine harness might be bad?

info:
the engine will hardly start. i have to start it WOT and its struggles like a mother ****
just put in a fresh MAF from ebay, was in shrink wrap and looks brand new.

**markc32** · 07-11-2011, 09:53 PM

i would check for bad ground connections first and start with the ecu harness....

**RSi** · 07-12-2011, 02:02 AM

Its an auto car? Not an Auto ECU in a Manual car is it?

**DarkCaporaL** · 07-12-2011, 08:50 AM

^ That's what it sounds like.

**amnash** · 07-12-2011, 09:31 AM

i dont know its the one that came with the car
if thats the case is there any way to make it work? how could i check.... actually now that i think of it, it says right on the side of the ecu rb20det 5 speed in permanent marker

**aN4rk1** · 07-12-2011, 09:41 AM

Originally Posted by amnash

i dont know its the one that came with the car
if thats the case is there any way to make it work? how could i check.... actually now that i think of it, it says right on the side of the ecu rb20det 5 speed in permanent marker

Could be a mistake or a case swap or something. Do you have anyone else in the area that you can maybe borrow a ECU from and check if swapping it helps.

**caliber676** · 07-12-2011, 10:07 AM

Rarely an ECU actually fails. Unless you have the incorrect ecu i would start with power and ground like Markc32 said. Then work your way from there checking the circuitry of the systems you think are at fault. Ie awd, abs etc

**RSi** · 07-12-2011, 01:38 PM

if its written on the side its been swapped.... are you checking codes through consult? If so that should give an ecu id. What is it please?

**DreadedFist** · 07-12-2011, 02:05 PM

Mine had a code 54 as well when I had an auto ECU. My car was originally an auto, but converted in Japan. Instead of getting a 5 speed ecu, they just used the auto ECU that was Mines chipped. I've since gone back to a stock 5 speed ECU, but haven't bothered to check for codes lately. Code 54 is fine, I don't believe it means much if anything, my car ran fine with it. I did notice a slight increase in idle speed when coming to a stop though, even with no accessories on. New ecu got rid of that.