fuel trims resetting??

[Mits3gts]

my fuel trims get reset back to 100% everytime i shut off my car...is this normal? i thought i read somewhere they are stored in the memory and battery backed up? thanks

 

[mastadogg2]

my fuel trims get reset back to 100% everytime i shut off my car...is this normal? i thought i read somewhere they are stored in the memory and battery backed up? thanks

Got a weak battery possibly, or something is not grounding up properly it shoud
not reset.

 

[Mits3gts]

possibly,but i dont have any other issues with the car at all..just all my fuels trims return to 100% everytime i start the car...i dont notice any side effects of this,just curious about it.

 

[steve]

On a 1G (like the '90 your asking about) Power to backup the setting is provided on pin 103 from the room fuse #19 in the drivers footwell. Make sure there is 12v all the time including when the car is off.

Steve

 

[Mits3gts]

well i checked the fuse and its good.also there is power there when the car is off.like i said i dont notice any problems,and when i drive my car,my trims go back to where i set them with the afc in the first place...maybe the 90's were different?