MSefi.com read only forum (Jan.15,2018)

Wazaaaaaap guys!
I would to know if anyone use these relay (without a relayboard).
If uses it, which number of leads? I can't identify them by schematic.

I remove the D19 and the results I got the measurements were the same.

Finally I think I have identified the problem, but please do not laugh if I'm talking nonsense.
I connected my MS in stim and fed with 12v.
I measured the D13 putting the two ends of the DVM at their ends and found 8.95v. I measured the D13 again placing one end of the DVM in non printed side and ...

How can I test the U6? And, how can I measure how much current MS is drawing from my power supply?

When I tested the D13, I put the black lead of DVM in and non banded side and the other lead in side stamped, resulting in 9.13v.
When I tested the trail that connects the banded side of D13 and the pin1 of the U5, I put the black lead of the DVM in the pin2 of U5(GND) and the other lead on the ...

trakkies,
the test I did yesterday when I measured the voltage on the track between the non patterned side of the D13 and the pin1 of the U5, was not about 9.13v.
The problem could not be there?

Anyway, how can I test the U6? And, how can I measure how much current MS is drawing from my power supply?

I'd some measurements 'on their own'.
With stim plugged and powered, black lead of DVM on non-banded D13 and another lead in banded side, DVM show 9.13v.
On v2.2, a rail between banded of D13 and pin1 of U5 and (+) of C15 had a hole. Using black lead of DVM in pin2 of U5 and another lead on this ...

I've tested D15. It's OK.
I removed L1 and L2 to tests, but I don't know how measure them. I think I haven't tools to this (only a DVM, without inductance function). There is a simple way to test L1 and L2?

I analyzed the schem of v2.2 and I realized the inductors L1 and L2 comes after LM2937. If ...

So, I've tested C15, C16 and U5 after replacing these components and are the same results.
- I measured resistance of C15, (normal leads and reversed leads) and DVM flashed a number then showed "1." (20k scale of DVM)
- I measured resistance of C16, (normal leads and reversed leads) and DVM showed ...

I measured the C15 and C16 capacitors. C15 seems ok but C16 looks shorted, apparently isn't charging.
Anyway, I'll replace both and then I'll test MS+stim again.

I really appreciate your help. Backing home I'll replace C15 immediately.
Originally manual indicates tantalum capacitors for C15 and C16. This is really necessary? My knowledge of eletronics is basic...

What do you get if the measure the resistance of C15 with MS not powered up? Then swap the DVM leads round and measure again?

I'm wary about saying to remove any components as it's possible to damage the PCB.

I'm travelling today. Tomorrow night I'll post results of C15.
When I powered stim with ...

right. I'm just not sure how you can have 9v on one side of D13 but near zero on the other without it blowing or getting hot.
However, it looks like you have a short on the 5v rail. There should be 12v on pin1 of U5 and 5v on pin 3.
Have you checked these with the processor removed?

Is C16 a ...

You can often test a diode in place. Don't power up the MS while doing so - the DVM supplies the volts to test the diode. D14 is the same and should give the same results with your DVM.

FWIW, it's best to use a decent power supply designed for the job. I've had problems loading code with one which ...

Are you using a PP3 battery as the power supply? If so, and there's 9v on one side of D13 but not the other, D13 must have failed open circuit.
Have you got a DVM with a diode test function? Will normally be marked with the diode symbol. If so, you can test the diode in circuit. Black lead to band ...

The Stim generates the tach signal (rpm). However, it looks like the lack of 5 volts is the first thing to sort.

First check D13 is fitted the correct way round. And the voltage to ground either side of it. It should be approx battery volts on both sides. If it is, next check continuity between ...

The injector lights won't flash until you have a tach signal seen by MS. Does Tuner Studio show that tach signal? Have you loaded in the code or checked if has been done?
trakkies, TunerStudio even connect to the MS. I don't loaded the tach signal in the code and I don't know how check it. How can ...

To check for a short in the Megasquirt PCB, power up the Megasquirt on a Stimulator or on the car and check the following points for voltage with a multimeter.

You should find the same voltage as the battery voltage on the following points: the small hole to the right of the larger three holes ...

Hi guys!
Sometime ago I bought a unassembled kit of v2.2. I assembled it but never tested, because I have stopped my project.
Now, I resumed the project and started to test the MS. I built the stim like the attachment and plugged on MS.
Unfortunately, the stim (or MS, or both) seems not work. The ...