I'm having some issues with my XT and decided to open up the ECU to see if I could find something obvious. I can't find anything, but could you please have a look and perhaps compare with your own ECU?

 

Couple of things I noticed: There seems to be an empty slot for a chip? And the chip next to it is a reprogrammable EPROM with some number stamped on it, perhaps it was modified? Also there is room on the PCB for another green LED, exactly opposite the existing one, why would they do that?

 

The ECU is btw from a 1988 XT turbo, partnr. 22611aa540 with a large "33" stamped on the cover.

 

The later style EJ ECU's up to 1996 also have that spare slot. A chip with modified mapping can be inserted and if you cut a jumper (I think it's the orange condensator in the same pic) it will only use that new mapping chip.

 

I can only imagine it is the same for the non-flapper MAF XT ECUs aswell.

Hi Marnix

 

I guess those chips won't work in the EA ECUs?

Nope... Joost