MD131842 ECU

[GTX]

Hi guys,

I have MD131842 ECU with E670 sticker on the EPROM. I have been told that it comes from 89 Mirage Turbo and can be used for 4G63T. I have two qustions:

1. Can I try it straight without any modifications with 510cc injectors? I should be running too rich, right?
2. Can this EPROM can be replaced with ECMLink one? It looks like it can be easily socketed, but I'm not sure about compatibility

Thanks
A

 

[fuel]

Considering that ECU would be expecting 300ish cc injectors, then yes 510cc injectors would make it run very rich if it even runs at all. The fuel/timing maps will be all different between the 1.6L 4G61 and the 2.0L 4G63.

 

[swe_gvr4_1991]

Please post pictures of the ECU board. There can be some other obvious differences to address also.

 

[Wizardawd]

Not to mention it could be a different board inside altogether. Don't ever go by the outside stickers. These ECUs have failed, rebuilt, replaced, etc so much over the years. A perfect example, in my GVR4, it's an ECU from a 1g DSM AT EPROM in the GVR4 case so it fits in the side panel.

Wiz

 

[GTX]

Here are the pictures:

 

[r4pt0x]

It's definately a DSM ECU - no Mitsubishi of that era had these brackets on the housing as they had the ECUs installed upright on the A-pillar. Only DSMs had the ECU underneath the center console.

And yes, according to ASA this part number fits the DSM Mirage C53 1.6l turbo 1988.04.1 - 1989.05.3


It would not run on an 4G63 without modification - different MAF, injectors, displacement, cams, turbo... Have a socket installed and get a modified ROM that fits your engine (maybe even the stock VR4 ROM might work on this ECU...)

 

[FlyingEagle]

89 4g61t and 90 DSM ECU's are plug and play with the harness, requiring no pin swaps.

Some coding may be different when you have it setup for whichever injectors, MAF, boost levels, etc, but it is groundwork that has been layed many years ago.

My C53A (4g61t harness and car) engine was running a 90 DSM ECU with Eprom chip. Link V3 is now installed.

I ran a chip with the proper parameters to keep 450cc, 609 MAF, etc, happy with the engine.

Everything I have catalogued about 89 4g61t ECU's:

"MD128615 1989 Colt DOHC FWD TURBO E2T34375 Federal
- E2T34375 8331 EPROM E670 US Colt Turbo 16V
- E2T34375 8621 EPROM E670A US Turbo 16V California Emission R129 installed"

"MD131842 1989 Mirage C53A DOHC FWD TURBO E2T34376 Federal
- E2T34376A 8Z07 US JE331A942C Mitsubishi Mirage Turbo 16V Federal R129, R130 in place
- E2T34376A 9561 US JE331A942C EPROM E670 Chipset label Turbo 16V Federal R129, R130 in place
- E2T34376 8316 EPROM E670 Chipset label Turbo 16V Federal
- E2T34376 8413 US JE331A979A R129, R130 in place Turbo 16V Federal
- E2T34376 8511 Canadian Dodge Colt Turbo Federal EPROM E670 Chipset label
- E2T34376 8511 US Mitsubishi Mirage Turbo JE331A934B R129, R130 in place Federal EPROM E670 Chipset label
- E2T34376 8531 Canadian Plymouth Colt Turbo Federal"

I am adding your ECU to my listings.

Now what I am wondering is why you have it in a DSM case? Your cover may be correctly matched to the board (which is interchangeable for all ECU and cases of this ERA), and may not be. Likely it is. CSM cases covers were as shown, but the base behind the board are a simple rectangle, with no outer tab blocks, except two flat ones that hold it place at the base when installed vertically, (as r4pt0X said) in the RF lower A pillar base/kick panel/dash.

4g61t's in USDM form use a 390cc injector set. Socketting that would be no problem. I cannot remember if there was any issue with mapping between the 89 USDM/CDN 4g61t and 90 USDM 4g63t. If the guys here know, awesome. If not, the wise men at ECMLink http://www.ecmtuning.com/

The ECU you have pictured is a Federal ECU. Resistors R129 and R130 indicate this.

You have Swede here looking in, so you are in good hands.

 

[FlyingEagle]

Wiki from ECMLink:

Click

Describes using a 4g61t ECU:

Click

"Using an '88/'89 Colt ECU
These ECUs are very closely related to the 1990 1G DSM ECU. In fact, they're so close you can almost use them interchangeably. The one item a Colt ECU does not have that a 1990 1G DSM ECU would is boost gauge control simply because the original Colt did not have have an ECU-control boost gauge in the dash anywhere. We can, however, modify this ECU easily enough while it's here to include this functionality if you want."

Basically what I said. /ubbthreads/images/graemlins/cool.gif

Overseas NZ/JDM turbo 4g61t's did have a boost light in the cluster. So having functionality in the ECU to trigger a light bulb or switch with given parameters would be very cool indeed, because you can with little
effort modify a CSM cluster to make this work. Using a DSM cluster or GVR4 cluster, even easier. Simple internal software stuff that you ask nicely to have included with your ECMLink product or will be made available for download. Be aware of all the features you need to access using the stock 90 DSM/89 Colt/Mirage architecture, you only have so many inputs/outputs to work with overall.

 

[swe_gvr4_1991]

Great pic of the PCB. It makes it much easier to identify the parts.
I have done a few guides of how to convert various boards into USDM. This board seem to be easy to convert aswell.
From a quick look i can see that there are various jumpers, diodes and resistor that are in place that must be removed.
Good thing is that you have the correct knock board and flyback caps for the injectors.
You are missing one or two of the IC's but it looks like you still have those ports, but your board har discreate components instead of a IC.

A conversion of this kind is a 30 minute job if done for the first time.

After that you need to run a few test in-car to check the solenoids Etc. That's the mechanical part.
For tuning and actually running the ECU you need a eprom emulator. I do not recommend chips anymore since they simply cost to much these days and offer nothing but a hassle if you need a retune. (The actual cost of a chip is like $5 but most charge up to $250 for a tune over email. Scary...)

 

[GTX]

And where do I find those HOWTOs? Is there any manual explaining how to convert the board and what type of emulator to use?