Need some help

[91gsxdsm]

Ive been looking around for info on my ecu and all i can find out is what my ecu is for.
The ecu that came out of my car (91 eclipse gsx) code is MD146946.
I dont think its for a turbo eclipse because its not on the vfaq page at all. The ecu i bought to replace this one (because the bored is fried) is a MD 128625 which i found is a FWD turbo ecu. Will it work on a AWD? What does the other ecu go to (MD 146946)? Also where can I find how to test all the relays and solenoids for proper ohm resistance?
thanks for any help given.
Edit: this is what I was using to find out what ecu I have now (but the code for the one that came out isnt here)
of the part numbers for the various turbo DSM ECUs, as pulled from the 98 Mitsubishi CAPS CD, the CD dealers use to look up part numbers.

1G TEL Turbo AWDs
Federal MT CA MT Federal AT CA AT
3/89-6/90 - MD145903 3/89-6/90 - MD145902 6/90-6/92 - MD165531 6/90-6/92 - MD165532
6/90-6/92 - MD166262 6/90-6/92 - MD166263 7/92-5/93 - MD193300 7/92-5/94 - MD193296
7/92-5/93 - MD193299 7/92-5/94 - MD193295 6/93-5/94 - MD304485
6/93-5/94 - MD304484

1G TEL Turbo FWDs
Federal MT CA MT Federal AT CA AT
High Line High Line 6/90-6/92 - MD165529 6/90-6/92 - MD165530
MD128625 MD128623 7/92-5/93 - MD193398 7/92-5/94 - MD193294
Premium Line Premium Line 6/93-5/94 - MD304483
6/90-6/92 - MD166260 6/90-6/92 - MD166261 ?/91-?/?? - MD193298
7/92-5/93 - MD193297 7/92-5/94 - MD193293
6/93-5/94 - MD304482
Note: don't ask me the difference between High Line and Premium Line, I don't know ;-)

 

[steve]

Perhaps the case is from a '90 Montero 3.0L V6 because it wouldn't run you car unless someone shoehorned the 6G72 block into your GSX. Try looking at the number stamped on the white edge connector. It will match the last 4 digits of the E2T number for a ECU.

The other ECU you have is a '90 FWD ECU. What you want is either a MD166262 AWD ECU or a MD166260 FWD ECU. You can use the '90 ECU but you'll need to swap (release and exchange) pins 6 and 14 to use a '90 ECU in a 91+ car.

Steve

 

[91gsxdsm]

Ok so are you saying the ecu that was in it is from a montero? IF so could this be why it wouldn't work and would that explain the board getting fried being that it WAS new ecu. i had to scratch the oem replacement sticker off to read the md numbers.
edit i re-read what you said the numbers on the white connector is 6578E on the casing its 5271I

 

[steve]

Based on the new number from the edge connector the board is from a MD166262 E2T36578 91-92 AWD EPROM ECU. It's worth having that one checked to see if it can be repaired since it's an EPROM ECU.

Steve

 

[91gsxdsm]

what would i need to check because the new ecu already had the caps leak. even if it turns to be good what would cause it to go bad so quickly?

 

[steve]

what would i need to check

That's beyond most people. You need to have a someone like me look at it.

The capacitors on these ECUs are 12 to 16 yeas old. They left the factory with defective capacitors so it's not like they failed quickly. If a 1G ECU has original capacitors they need to be replaced ASAP.

Steve

 

[91gsxdsm]

By what do I need to check, I ment on the casing it gives you a warning to make sure your relays/solenoids have proper ohm resistance values. What type of relays and things cause the ECU to go bad? I have read some on the ISC sensor messing with it. Thats what Im asking are there sensors or anything that can also cause damage to the ecu if they are bad. Could it not be the caps but somthing else? Im just wondering thanks.

 

[steve]

The way the ECU controls quite a few things is by switching a voltage to ground. The drivers to do this can only handle small amounts of current or they will burn up. The design uses the resistance of the windings in a relay or coil like in the ISC to limit the current to safe levels to protect the drivers. Any solenoid, relay, or the ISC with resistance lower than the spec could damage the ECU.

Another thing to watch is the +5v power for the sensors and the sensor ground. A miswired MAF, O2 sensor or bad TPS could short the sensor power or put voltage on the sensor ground and cause the circuit traces to be burned from the board.

Steve

 

[91gsxdsm]

Are you able to tell what has gone wrong by looking at the board if you saw it in person?