Fuel Pump not getting signal from MS3X.
 

My fuel pump is not coming on with the fuel pump Test, nor dose it come on for the 2 second prime when the key is turned on. I can run a jumper from the Squirt side of the fuel pump relay to ground and the pump comes on. Is there something I'm missing? Also Not getting any RPM, not sure if the two are related or not. Also posted on the MSExtra forum.

If you're not getting RPM, the MS won't go into cranking to turn the pump on. It should still run the pump for a couple seconds to prime the lines when the MS is first powered on.

When i use the jimstim to power things up I don't get the 2sec prime signal. When i use the test fetcher in tunerstudio with the jimstim i also get nothing all i do get is the test mode lite and the Ready lite but nothing else.

Not sure if it means anything but the tacho lite on the stimX is on all the time and the "Not RPM Synced" lite is on in tunerstudio.

This is a v3 ms3/ms3x board setup to run an 13b rotary with a GM TBI, TPS, IAC, a VW 4 coil pack and stock Mazda CAS, the board mods setup for the stock GM IAC, and stock Mazda CAS VR's. Only other mod is the Clock on the ms3 board, and I think i have the JP3 jumper on the ms3x board can't remember ill check when i get home around 1PM PCT today

Did you build your main board yourself?

Yes...I used to repair cameras for Nikon so I have good soldering experience, although I'm still human so mistakes could have been made. I did check my Solder joint with a lop after i was done.

You're at the point where you need to trace the whole fuel pump trigger circuit from the microcontroller out to the final drive transistor. It's common for that transistor to blow. Can be replaced by a more robust unit. Just step through the whole thing with a jumper installed from 5V to the pin on the controller socket that leads to the drive circuit (off hand I don't remember which...look up in schematic :) ).

I was preparing to do just that when realized that In 2012 when I put this ms3/ms3x together I used the msextra.com OLD assembly instruction available at the time, which said to put the transistors in to Q4 and Q20, I when throw them again and notice that they said Q4 And Q20 but the picture showed them in Q2 and Q19 so I moved them and all works well.

So I finished all of the pre-start stuff and tried to start the truck, it pops and snorts but no start so here is a .csv file for you to look at, it's anything but good looking. Thanks for your direction on this.

That's an ignition log. Need to see a regular log.

Generally popping and no start needs more fuel is needed. Assuming timing is correct. You can disable the injectors then crank with a timing light to make sure the pointer is at least lose to the pulley mark.

Ok thank you, try this one.

In that log the maximum RPM seen is 43 RPM.

Either there's something wrong with your trigger settings/VR circuit, or someone is manually cranking the engine over with a ratchet. ;)

So looking back at the ignition capture, the 2 tooth wheel looks basically OK. The 12 tooth wheel is all over the place. Missing pulses.

Are the pots adjusted correctly?

I ordered a new starter, hopefully that will take care of the ratchet speed (LMAO).

The VR's I adjusted all the way counter clockwise then back clockwise 1/4 turn. Now on the VR's I'm using the ms3x board for ignition so I would use those VR's for adjustment right? Thinking it is but just checking.

NAPA just called my starter is in, if it doesn't start ill post another msl and csv this afternoon.

Well that didn't work, Dryer broke so priority's were changed, (you married men know what that means). Also new motor mounts and trans mounts came in the mail, got the starter & trans mount in yesterday. will get my new motor mounts in today and will try and get the pickup started, wish me luck!

here is the latest Logs. Cranks faster lol.

Is there anything I'm missing? Would be more than happy to provide more information.

Sorry, just won't have time until about tomorrow to look. Haven't been on the forum hardly for about 2 weeks.

can you post your msq

RPM jumping from 0 to 80 RPM in the datalog.

Looking at the composite log, tooth capture is fine. However the 2 two tooth VR is inverted. Swap the 2nd trigger to falling edge and see if you get an RPM signal.

If that works, then make sure your VR polarity is set correctly on the board.

In TunerStudio while cranking, I am betting you are not seeing a steady RPM of about 150RPM.

Thanks Aaron, I know your busy, I will check things out when i get home.

Well it's been 3 months and it's a 54 degree day so finally got back to the REPU.

I'm assuming by 2nd trigger you mean crank trigger but i wasn't sure so i did both crank and cam. Looks like things are still all over the map but I'm not exactly sure what I'm looking at.

MSQ IS: 15.03.00

CRANK MSL: 15.30.58

CAM MSL: 15.36.13

Meant the CAM signal. Set it to falling edge then try to start. Datalog both the regular log and a composite trigger log.

If I remember you are using the 2nd gen CAS. Pull it out of the block and spin it by hand. Post datalogs of that.

You still aren't seeing an RPM signal.

Here are the msl and composite logs, CAS out, turning by hand, Falling edge. Sense there were no other noises i could here my fuel pump cycling on and off. if i went faster is stayed on most of the time. pulled my injector and coil fuses during all this.

I think your CAM sensor (2 tooth wheel) is wired backwards. Check your wiring as well as configuration of jumpers on board, then switch back to rising edge when corrected.

But, I'm seeing RPM on that datalog and it's fairly stable as far as what one would expect from hand turning.

I did take things apart and check the jumpers and all was OK but when i put it all back together i now have no rpm. I'm so frustrated that I decide screw it and I'm ordering an v3.57 board and starting all over again, I'll work on the v3.0 board later, I have other cars I can put it in.