DIGIFANT ECU Part Number help

[TJ Fitz]

Hello,

I have a 1991 Aigner Cabby with a bad ECU. The part number on the ECU says: 037 997 022 KX

Looking for a used replacement ECU I keep coming across numbers like: 037 906 022EN

Can anyone help me figure out what part number I need? It's a non California car.

Thanks,
T.J.

[TJ Fitz]

I think that my old ECU part number is osme sort of remanufactured piece.

What is the difference between 037 906 022 DE and 037 906 022 EN?

Thanks,
T.J.

[Black_cabbie]

Any Digifant ECU will work just fine. Even from the MK2 GTI cars.

[TJ Fitz]

Sorry for my ignorance here, but here are a few more questions:

Does it have to be from an 8V engine?

How about one from a Jetta or Vanagon?

Thanks for the help.

T.J.

[kamzcab86]

The 1990 Cabs received ECU #155998004. In 1991, Cabs received ECU #037906022EN. That ECU was dropped in 2002 and the replacement ECU is #037997022KX.

FWIW, 037906022DE was dropped in 1991 and the replacement is/was 037906022EN.

So, in theory, you can use the 037906022EN ECUs that you find.

HTH

[TJ Fitz]

HTH thanks for the info. I will check out of few junk yards to see if I can find an ECU before I plunk down the nearly $1000 for one.

Since I now have the KX one in there I guess this is not the first failure of the ECU in the cars life huh?

T.J.

[tolusina]

T.J.,

Hi, welcome to the 'tex.

The "X" in the part number suffix stands for eXchange, as in re-man or rebuilt, not the first failure.
You've noted above, the car is not a California model, still, check the number of pins on your current ECU, compare to your replacement. California DigiFant I cars use a 38 pin connector, DigiFant II cars use a 25 pin connector. Not all pins may actually be used in either version.

I'm wondering if you are 100% positive the ECU has failed?

Ron

[diceman469]

I have one if you're interested that I paid about $125 for about a year ago. Throw me an offer!

[TJ Fitz]

Ron,

I'm not 100% sure but here's what I have...

Fuel pump works and there are sparks at the plugs. Car cranks, but won't turn over. I think there must be an issue getting fuel into the cylinders and since I have good fuel pressure I'm thinking it's the ECU.

T.J.

[tolusina]

T.J.,

Quote, originally posted by TJ Fitz »

....... I'm not 100% sure but here's what I have... Fuel pump works and there are sparks at the plugs. Car cranks, but won't turn over. I think there must be an issue getting fuel into the cylinders and since I have good fuel pressure I'm thinking it's the ECU....

There are several other places I'd look prior to ECU replacement.

The main ECU ground from pin 13 grounds directly at the battery ground terminal, I'd start there, looking for loose brown wires, clean any corrosion, repair all corrosion damage.

The ECU has it's own fuse and relay separate from the fuel pump circuits. That you have spark is a pretty good indicator the fuse and relay are good too, check fuse S17 anyway, it's just too easy.

I'd sure remove the large intake duct between the Air Flow Sensor and the throttle body, look at and through it for cracks and splits while flexing it in all directions, use good lighting.

Check for power on the red wire to/at the injectors, it should be hot continuously whenever the fuel pumps run.
If you have a two color LED tester, you can check for an injector signal on the brown/white wire to the injectors.

Have you checked to see if the cam or distributor timing has jumped?

A fuel pressure check directly at the fuel rail is a real good idea, there is a convenient test port right on the rail. (Oops, I see you've stated you have good pressure, I hope tested with a gauge.)
Have you checked for a plugged fuel filter?

Ummm, have you maybe disconnected the Air Bag controller?
________
List above is not necessarily complete, nor is there any particular order, it just came out that way.

Ron

[TJ Fitz]

I have checked almost all of that list. Seems to be an ECU problem. Are the various part numbers interchangeable? (037 906 022 **)

I think I am looking for EN or DE.

Thanks,
T.J.

[CanadianCabby]

look on ebay for one... i got a good bosche one for $1.. and i havent had any problems with it... so.. its worth a shot over one from the dealers... or u could just find a digi golf at the wreckers... u dotn really have to worry about cally cars.. they will be digi 1 not digi 2