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Pic for context: Notably absent are the block and crank, which are off at the machine shop.

- junkyard dave

Sooooo.... image.png See those capacitors on Vdd? Turns out that following the circuit in the datasheet is a good idea. Thanks to @blundar for suggesting that this was probably the problem. It was. Interestingly, the behavior of the trans line pressure is completely different than when I was driving...

Can you post the document with how the trans works? I can't seem to find it.

I'm fresh out. Time for my nth Digikey order I guess. In other news, I've got all the pins crimped for a Proteus adapter harness, just need to stick them in the connector. Here's the pinout and Proteus mapping if someone wants to look it over. My pinout is column E. https://calc.holdemanenterprises....

I changed my mind about giving up, and decided to try again. New gate driver, new MOSFET. And I found a problem: I had the diode wired to ground instead of 12V. I don't think that would kill the gate driver, but I decided to give it another try anyway. It worked perfectly - for maybe a minute. Then ...

Well it didn't work. I added a 100 ohm resistor to the gate, and replaced the 1n4001 with a SB5200. It failed in the same manner as the first one. The gate driver outputs about 4.5V, no matter the state of the input. Theories: 1: My MOSFET is somehow broken. I tested it on the ATX power supply I use...

Thank you both for the lessons in electronics! I ordered some more drivers from Digikey. When those arrive I'll replace the one that's toast, add an 100ohm resistor, and replace the 1N2001 diode with a SB5200. That diode should work, no? It's what I happen to have. It's rated at 5A average, 20A repe...

The yellow trace is set to zero offset, so GND should be the middle division. So it looks like the noise is indeed going through ground, but centered maybe 0.5v above it. Taking that into account, the max voltage must be about 5v.

So I'm taking a step back and forgetting about current mode control for now. One of the things I learned from trying to figure out how to do it was that I need a gate driver for the MOSFET. So I built this circuit. driver.png At first I did not connect the two outputs of the driver, and this was the...

mke's can't actually use that nice board because he's busy rebuilding his house one piece at a time. Someone needs to go bribe his wife to lift her thumb for a bit.
/jk I respect it.

Ford was nice enough to put detailed thermistor values in their service docs:

I bought another PCM so I could have another connector, and this one has a different case: IMG_20210521_170859.jpg This PCM is from a 1997 Taurus/Sable. The advantage of this case is more room to place PCB components. The disadvantage is that it doesn't have the heatsink for the PCB. Though that bri...

Bill, is the tune on REO the one that ran the engine? It's set up as wasted spark.
https://rusefi.com/online/view.php?msq=307

http://www.cplusplus.com/ is a great source of tutorials for learning C++. board.h contains preprocessor directives, so you should read the article on that so you have some idea what you're working with. There are a lot of board.h files you can look at for examples. I'm not sure if any of them use S...

The last remains of my first ECU have finally been thrown away, the last bits of value having been plucked out and reused.
RIP terribleEFI, 2014-2021 In case you wonder, that's a Great Value dishwasher capsules type of ECU enclosure.

Am I remembering correctly that those coil packs are dumb coils that need an external driver? Maybe you've addressed this already.

Hello there. My name is David, and I am a noob. We noobs can get a lot of flack. And for good reasons. We tend to ask a lot of dumb questions, try to solve problems with dumb solutions, and just get in the way in general. But that doesn't mean we need to go hide in a corner until we're not noobs any...

FWIW I'm getting the same error.

Posting this here so I don't have to keep googling for it: https://www.analog.com/en/analog-dialogue/articles/current-measurement-in-solenoids.html

Playing around with Falstad Circuit simulator, I've come up with this: https://falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWEA2Z0FgCxmQZl5JprsmABwgKSWXUICmAtGGAFABO4ATBVptxS5d+1GIQDsHASCH9ZMyBWpcwcKfLDjk0vlAVqAJtPmZeyZSAP0AZgEMArgBsALq0fgiIMtTA8PI8ChYOCFkBABOKlxxSGRw4UhxQWhcVgBnfxlxLmNhPQg7R...

After some more discussion (a gross simplification), @mck1117 pointed out the obvious face-palm-inducing problem with this design: If the MOSFET is off, there is no current to sense. My plan now is to add an op-amp, and move the shunt resistor to between the solenoid and the diode+MOSFET. Matt poste...

After a talk with @mck1117 in Slack, I have decided on a few changes to try: 1. With the 0.5 ohm shunt resistor I have now, the shunt voltage at max on is about 1.2 V. This leaves the Vgs at about 3.8 V, which is very marginal. To counteract this, I am going to supply the MCP1407 with 12V instead of...

Schematic with updated resistor values:

So I hooked up 3 1.5 Ohm resistors in parallel because that's the smallest resistor I have on hand. It seemed to work pretty well, but after a drive of about a mile, the MOSFET heatsink was quite hot. Here is a scope screenshot taken while driving, with A channel attached to the MOSFET driver output...

Current sensing and control status update: The circuit kind of works, but it seems that dunce me got Ohm's law wrong, and the ~2.3 amps that the solenoid draws and the 100 ohm resistor I have are not the match I am looking for. 2.3 * 100 = 230 V I'm looking for something more in the range of 100-200...

After some review, it turns out I totally botched the wiring. Specifically, reversed power and ground.

I built this circuit and it doesn't work. Both ICs get hot. I guess I need to break out the scope.

I'm not sure why it shows this error if ETB is disabled, and I don't think it is supposed to, but I think you can fix it by going to "Full Pinout 1/3" in the "Controller" menu and set the ETB pins to "NONE".

Just putting this here so I can remember it.