I have a 1992 B2200 Automatic FI. And have multiple codes:
8 - Airflow sensor
9 - Weather thermosensor
11 - intake air thermosensor
12 - throttle sensor
14 - atmospheric pressure sensor

Long story short, I have replaced the MAF, Fuel pressure regulator, fuel filter, plugs, and some basic oversight of vacuum leaks, connectors etc. I am now thinking my ECM may be the culprit. I don't see any obvious leaks from capacitors on the board, but it does seem that many have had an ECM issue. In past threads, people use ECM rebuilders like www.aveprocm.com, but that website does not appear to work, and I cannot find any other information about them. Maybe they went out of business long ago?

Does anyone know of a reputable ECM /ECU rebuilder? I know there are some floating around ebay, but from what I can tell, the sellers are not the people rebuilding, and there have been some reports of bad experiences. At this point I would really like to have mine assessed and rebuilt if needed.
Any information would help. Thank you.

 

Sorry you had to replace all those parts first. FYI for future reference there is a diagnostic tree to resolve what the actual problem is and how to test parts before replacing them. Unfortunately, many times replacing random suspected parts can cause additional problem adding to the existing original problem.
As for rebuilt ECU .... just find one that seems to have been around a while and has a good warranty and replacement program. What most do not realize is ECU are very seldom ever rebuilt. Most are clean and tested and hopefully a flash or what is called a pass through is done so you get a working ECU.

If some of you ever saw the actual ECU health testers out there you would LOL and go WTF? The tester (most used by ECU rebuilder/ retailers) is a simple box that you use adapter that fit the ECU connector and plug it into the tester. Then you push a button, if the light is green, it is considered a good ECU if RED it is tossed. lol the only exception is a few rare ECU are then actually either sent out to a specialist that will spilt the case and start removing the bad parts. This takes hours. That why basically most "rebuilt" ECU are so inexpensive. Hey are not really "REBULT"!

You might also think about a recycler for a ECU and find a local service shop that has what is called a pass through. This is a reflash tool that can be used to simple "REFLASH" and ecu. They must have the proper updated programing to do this. But a shop that has the pass-through device will know if they can flash the ECU. They should only charge about 50 dollars as it only takes about 10 minutes. We use one in the shop but do not have a complete adapters selection and only purchased the basic reflash programing from the pass-through manufacture.

 

Thanks for the reply. I do think there is an underlying problem giving all these codes. I get what you’re saying about replacing parts, makes sense. It’s just hard not to replace parts when the truck has 250k. Seems like everything needs to replaced haha. Im going to search around for a local shop to have it looked at, or do a “pass through” as you suggested.
If you know of any places around me you can reference that would be great. I noticed you’re in northern california. Im in San Jose.

 

Sorry I don't know your area for what shops have. Most of my driving in your area is to PASS-THROUGH... lol My friends that own or work in shops are in Fremont and Santa Cruz and neither have a pass through.
You can check with Rancho Cordova Recyclers for a used ECU? Most of the Re-cyclers there are connected nationwide with other registered Recyclers, so changes are good to find a used one with a warranty exchange offer.

 

I reached out to a Rancho Cordova recycler, who then referred me to a shop in Wisconsin. Apparently, this shop has a tech who has a dummy bench and specializes in "rebuilding" ECU's. I spoke with the shop owner and he says his tech will replace anything on the board that isn't up to par and was actually retired now, but still provides this service (30 years experience). Not sure if the service entails a pass-through or re-flash, but it was the only shop that was confident in helping me. I shipped it out early this week and in their hands now. Hopefully I will get me ECU back by next week, but may be delayed because of the holiday. I will post an update once I get it back and plugged in. If everything works out, I will post contact info for the shop.
I believe the rate was $175 + shipping.

 

That sounds good...
The only funny thing is the experience years claimed?.... OBDII has not been around but for 28 years and no one was doing ECU rebuilding until several years after then. Maybe they meant 20 years' experience which would be more accurate and actually good. ECU? I have taken apart a few ECU and tried to replace parts, it consists of micro soldering, VERY steady hand and an angel on your shoulders.
You might want to post the name of the service shop for other's that may need their service as well?

Look forward to reading positive results and a MAZDA up and running again!

 

Keep in mind that "feedback carbs" have been around since 1981, and they were electronically controlled, so that was 41 years ago......the guy could easily have 30+ years experience working on control boards when you consider pre-fuel injection.
This brings back memories of the worthless Chrysler feedback system where the electronic control box was riveted to the air cleaner! Great place to put it!!

 

Sure but I doubt that is where the people got thier experience? But good memories if you did have a engine that had those you know how awful and problematic they were. Most of us would rip the units off and replace any part that would revert back to nonelectronic controlled equipment.
ECU/ECM etc., engine control vehicles started with OBD1 (dumb computer) in the early 90's a feedback is not and nowhere the same thing. AND no one I know of would rebuild a OBD1 ECM unless it were absolutely necessary and even though they were very simplistic a home electronic hobbyist could disassemble and repair them a service shop offering the service cost would be considerably more into the several hundred-dollar range.

Most of my information comes from a Electrical Engineer friend who works as plant manager for the Chrysler ECU manufacture facility and also hand on experience with ECU>ECM and TCMs Performance calibrating and OEM flashing.

ASE

 

Update:
I received my ECM back from getting serviced and it worked!! I plugged the ECM in and it started up, no check engine light. It felt a bit sluggish, but I remembered I had to reset the timing because I advanced it when I was troubleshooting. Once, that was set, my B2200 is running great! I cannot say how relieved I am to have finally tracked down the issue. I did not look at the ECM board to see what was done because there is a sticker covering it and voids any warranty work. I probably wouldn't be able to tell anyway. When I first took the ECM apart it looked brand new, no capacitor leaks, obvious damage or wear.

I really wanted to know exactly what the issue was and the technician who worked on my ECM, but the shop I used outsources to him. I was only told that he was a retired guy that also use to work for IBM and was very familiar with Mitsubishi computer parts, etc. I will call the shop back and tell them my outcome and see what other details I can get. I cannot say enough good things about the shop and Kamron for helping me out. The shop owner Les was also very helpful and friendly.

Here is the contact information for the shop:
ELMER'S AUTO INC.
W877 Elmers Rd.
Fountain City, WI 54629
800-362-5004
www.elmersautosalvage.com

 

That's great news !!!