I've got to say Thank You to a member sending my his damaged ECM for study purpose. I know you'll come forward to acknowledge this. 

 

I figured for the sake of knowledge of the ECM why not document as much as I can for other to learn. I can say without a doubt the circuit board is mylar and securely glued to the aluminum case. It's a single sided solder setup but it double sided tracers. 

 

• MEMORY - Toshiba TC55257DFI-70L (256k CMOS SRAM 32k X 8)
• FLASH MEMORY-  Intel AB28F400BR-B80 (4-Mbit (256K X 16, 512K X 8) Smartvoltage Boot Block Flash Memory. Access Speed 80 NS)
• PROCESSOR - Motorola SC416652GMFT20 - 68336 Family - 20 Mhz Frequency

 

It's going to take me time to hunt down more I've really straining to see the chip numbers through the spray coating on top of them. I'm too afraid to rub it off. Might make things worse.

I may have another to send in if interested I replaced mine with a used ecm 

PM sent...

 

Michael do you think you can help some of us in any way with the ecm after looking into it?

 

 Perhaps build a simpler more reliable set up?

Edited July 31, 20168 yr by JAG1

I'm trying to find out some of the chips and other parts within the ECM to learn more about the design. Like the processor has over 72 MB worth of documents on what it can do. I know now that since the circuit board is glued to the case the case acts like a heat sink for all the parts. I was looking up specs for operation temperatures and this ECM can tolerate a lot of heat in operation.

Mike,

 

 

So if the wts issue in the ram?

 

Could we solder on new ram and force a flash by setting coolant and tips to 5v on start.

 

 

 

RAM is is just RAM there is no need to reflash again you not changing the FLASH RAM. If you where to solder on new RAM just plug it in and run the software would be untouched being its stored in the Intel Chip if I'm not mistaken. No different that changing the memory in a computer has no impact on what store on your hard drive (flash ram).

 

Not to mention seeing the MOSFET's for the lift pump circuit those would be easy to replace if I could get a part number. 

Edited July 31, 20168 yr by Mopar1973Man

good thoughts.  

The bad part is getting the ECM can open and access the circuit. It's a folded thick aluminum can so this adds a bit more challenge. Once you fold it open your start to crack the aluminum case.

I can have new cases made if you need one let me know the ideal size etc.

So that would require figuring out how to remove the mylar circuit board from the current case to be re-applied. I'm not sure how that could be done as of yet. 

 

It's actually glued directly to the aluminum case. So the entire case is a heat sink for the processor chip. After reading up IIRC the processor is capable of operation temperatures of 150*C or 302*F.

Edited July 31, 20168 yr by Mopar1973Man

Make a new case that incorporates that into the new housing somehow?

Has to be water tight. Might be a tough order being the 50 pin plug is soldered to the board and the mylar being glued to the aluminum. Hmmmm...

Just cut the aluminum around it?.

 

Is harness long enough to go further away from engine and make a bit larger watertight box beig enough to remount mylar  leaving old aluminum around ?

 

 

Edited July 31, 20168 yr by JAG1

33 minutes ago, Mopar1973Man said:

Has to be water tight.

After I cut Volvo ABS control modules open for repair I reseal them with clear RTV.  I've never had a problem with water infiltration.

26 minutes ago, IBMobile said:

After I cut Volvo ABS control modules open for repair I reseal them with clear RTV.  I've never had a problem with water infiltration.

How do you know how to repair them?

This is awesome news! Mike, maybe you can become the source everyone is looking for for quality repair/rebuilt/new ecms! 

27 minutes ago, JAG1 said:

How do you know how to repair them?

You can see the solder pulled away from the pin connectors on the board from all of the hot/cold cycles.  I re-solder them, put the case back together an seal it with clear RTV. 

Like the delayed "Wait To Start" light would be bad memory so replacing the two RAM chips would be easy. As for the failed lift pump you just have to find the MOSFET that controls the lift pump circuit and replace it. Like random revving issues that might be a processor issue. I've got to do some more reading on that Motorola processor and get better understanding of it functions. 

I think the most common issue we are going to have in the future is the WTS as memory is going to start wearing out.   

Mike this is fantastic your delving into this. You are a God send to all of us second Genners.