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jdm to dsm ecu running cyclone intake manifold

lancerglx

Member
Joined
Nov 7, 2012
Messages
20
Location
malta
hello people ,wondering if someone can clarify what has to be done to swap from a jdm ecu md 128618 dual board non eprom 195 bhp to a dsm ecu as mine has been having problems with fault 25 repeatedly
for the baro sensor and suspecting the ecu.
My wiring is compatable with the 1990 dsm wiring diagram so i believe my ecu is 89 or earlier.
The engine is from a jdm vr4 galant but is on 91 lancer so i dont know the exact production date of the engine.
I am looking into purchasing a chipped and socketed ecu from ecm link but worried about causing more problems i cant handle and i cant get any help in my country as theyre not familiar with the vr4 here.
My ecu has been giving fault 25 for the barometric pressure sensor which i replaced twice already and it will only last about 6 weeks before the car well throw the CEL again and start to stall.
Any help greatly appreciated as the car is practically unbearable to drive once its at normal running temperature.
cheers and thanks for your time guys. /ubbthreads/images/graemlins/bawling.gif /ubbthreads/images/graemlins/bawling.gif /ubbthreads/images/graemlins/bawling.gif
 

tektic

Well-known member
Joined
Dec 19, 2012
Messages
1,497
Location
ronkonkoma, ny
If pin for pin its getting the same inputs it should run as expected. The fpr vacuum pluming needs to be used to actuate the cyclone. The code needs to be modified to allow the fpr to activate over 4200rpm and then deactivate below 4k.
 

Spyke169

Well-known member
Joined
Aug 17, 2005
Messages
324
Location
Greenfield, Wi
Are you looking to replace your MD128618 with a '90 DSM ecu? or a '91-'94 ecu? IF you already have a replacement ecu, and can tell us what the part number is that would help us to let you know what needs to be done to get you running correctly with cyclone control.

A '90 DSM ecu will be direct plug and play for you, with the exception of pin 53. Pin 53 on the DSM ECU was "EGR solenoid output" something the JDM VR4 didn't have. On the JDM VR4 pin 53 was instead used for Cyclone control. If you want to use a '90 ECU, AND want to use it to control the cyclone manifold with the ecu, the ECU you are after is a MD145903 EPROM ECU. You will have to use a chip, or Moates Ostrich, to rewrite the section of the code for pin 53.

If you are going to use a '91-'94 non EPROM DSM ECU some wiring will need to be changed on your '90 harness. click can walk you through this. You would however need another way of controlling the cyclone like this click

Or if you use a '91-'94 EPROM ecu, you can do the wiring changes, and then rewrite the section of the code for cyclone actuation.

Like I said, let us know what ecu you are looking at and we may be able to help a bit more. Also a good thread to checkout is this one, it explains a little more about the swapping a JDM to DSM ECU.
 

lancerglx

Member
Joined
Nov 7, 2012
Messages
20
Location
malta
from what ive read so far a 90 dsm ecu would be an easier option.....i dont want to complicate things more than i have to for now because i have to get all info off this site or 4g61t.org,like i said they are not too familiar with the vr4 here.
I havent purchased a dsm ecu yet,i was thinking of purchasing from ecmlink .
The reason i want to swap it is because of the problem i mentioned earlier about the maf going bad aproximtly every 6 weeks.
Do you by any chance have the slightest idea what would cause this...apart either from a bad ecu or faulty wiring?? /ubbthreads/images/graemlins/bawling.gif
 
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