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PMD question

mattthebrat

mattthebrat

Diesel Dork
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Location
Mankato, Minnesota
NO this isn't another stalling thread, since I don't really own a vehicle with a PMD, but am always curious.

My question to you gurus is... How exactly does a PMD work? Where does it get it's signals from, how does it convert said signals into controlling the pump, if I cut one open what all would I find?
Basically I want to know all you've got on how one of these things ticks.
 
It basically is an OP Amp takes a low current/volt signal and bumps it to high one to operate the IP's fuel solenoid.

If you cut it open you will find 2 big transistors soldered to a circuit board, 2 threaded studs to carry trons to base of those transistors all epoxied deep in conformal coat resin, you have to destroy it to look at it, on the board is a IC chip the recieves it's "messages" from the PCM, to pulse trons supplied to the fuel solenoid on end of the IP, many have tried to duplicate it, many have failed, with all R&D required to fix the design far less expensive to just go after the failure method of the original one, remove the heat www.heathdiesel.com (PMD Isolator).

Closest replacement/total reinvention was a product from Remar-Q (Sold-D) was marketed as "THE REPLACEMENT to own", I'm not even sure if it is still sold, but it at it's genesis it had temperature relibility problems, they apparently forgot these trucks sometimes need to start at temperatures below 50F. AFIK nobody has gotten to the 5 yr warranty period yet, all replaced, but i stopped following it when so many people were having issues with it, and the heath solution with 7 yr warranty was a no brainer, install and forget it, next issue please.
 
I've always wondered, with the wattage those two transistors
supposedly put out, how is all that current carried by those tiny
wires on the harness? They can't be bigger than 16 or 18 gauge.
 
Turbine Doc said:
Closest replacement/total reinvention was a product from Remar-Q (Sold-D) was marketed as "THE REPLACEMENT to own", I'm not even sure if it is still sold, but it at it's genesis it had temperature relibility problems, they apparently forgot these trucks sometimes need to start at temperatures below 50F.
Click to expand...


So is this what it means to be PMDless? I have seen several IPs on Ebay that said they were PMDless.
 
Means you get a IP with no PMD on it, depending where you buy the IP a PMD adds +$200 extra to the cost, since so many now remote mount the driver and keep their remotes, many retailers now selling IPs without it.
 
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