Fuel Pump not getting signal from MS3X.

[spokanerxdude]

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 rx7club forum.
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[Matt Cramer]

Does the fuel pump output work on a Stim?

[spokanerxdude]

Does the fuel pump output work on a Stim?

No...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

http://www.msextra.com/forums/download/ ... p?id=43916My MSQ is here.

[Matt Cramer]

Is this a V3.0 or V3.57 main board?

[spokanerxdude]

Is this a V3.0 or V3.57 main board?

v3.0

[Matt Cramer]

Check the Q2 circuit.

[DaveEFI]

The pump relay driver circuit on the V3 board is prone to failure. Dunno why.

To test properly, remove the processor board and jumper 5v from the proto area to pin 33 on the DIL40 socket. Switch on the ignition, and the pump relay should make, and stay made.

[spokanerxdude]

Thanks guys ill give it a try as soon as i get home.

[spokanerxdude]

The pump relay driver circuit on the V3 board is prone to failure. Dunno why.

To test properly, remove the processor board and jumper 5v from the proto area to pin 33 on the DIL40 socket. Switch on the ignition, and the pump relay should make, and stay made.

No luck with 5v to pin 33 no fuel pump with the stim or in the truck.

[sheek]

had an issue like that, turned out to be the jumper harness had a poor connection on the db37 side. check for continuity between the db37 connector and the harness

[DaveEFI]

The pump relay driver circuit on the V3 board is prone to failure. Dunno why.

To test properly, remove the processor board and jumper 5v from the proto area to pin 33 on the DIL40 socket. Switch on the ignition, and the pump relay should make, and stay made.

No luck with 5v to pin 33 no fuel pump with the stim or in the truck.

Right. Chances are Q2 has failed. Maybe Q19 too.

[spokanerxdude]

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 today 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.

I have ordered a starter so the starting RPM problem should be salved soon