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

I completed my DIYAutoTune MSII kit and everything works with the Stim fine so far. I would like to test my trigger wheel and VR sender like they did in the DIYAutoTune video. I know the VR+ is wired to pin 24 and the VR- is wired to pin 2. Can anyone tell me what other pin need to be connected on the 37 pin D connector to run this test.

Power and ground.

Matt Cramer wrote:Power and ground.

Is this correct?
Pin 19 to gound
Pin 37 to +12

No, see the wiring diagram here for what pins do what:

http://www.megamanual.com/v22manual/mwire.htm

Matt Cramer wrote:No, see the wiring diagram here for what pins do what:

http://www.megamanual.com/v22manual/mwire.htm

Matt
That is the drawing I am referencing. It shows pin37 as +12(from switch) and pin 19 as ecu ground. Are you saying I should also ground pins 8,9,10,and 11? Keep in mind this is an off the car test. I am using the wall wart for power. I have functional RPM with the Stim but the directions say this is not truly functional with VR sensor and the Stim yet. I want to verify I have a good square wave.

Thanks for any help and your patience.
8803

A VR sensor produces a (near) sine wave. If you want a square wave you'll need a hall effect type.

trakkies wrote:A VR sensor produces a (near) sine wave. If you want a square wave you'll need a hall effect type.

Please don't change the subject of this thread. I know about the VR wave shape and the ECU will take what it needs. What I am trying to do is test this out of car.
All I need is if am I powering and grounding the correct pins on the 37pin connector.

It shows pin37 as +12(from switch) and pin 19 as ecu ground.

Incorrect.....

+12v to pin 28 and ground to pin 19, will do it.....

Ken

EDIT:

Please don't change the subject of this thread

I am guessing here, but I would suspect that Dave posted that in the wrong place by accident.....
He is very knowledgeable and a very good resource!

kjones6039 wrote:

It shows pin37 as +12(from switch) and pin 19 as ecu ground.

Incorrect.....

+12v to pin 28 and ground to pin 19, will do it.....

Ken

EDIT:

Please don't change the subject of this thread

I am guessing here, but I would suspect that Dave posted that in the wrong place by accident.....
He is very knowledgeable and a very good resource!

Wow! Now I am further confused. Matt posted this link which I used as my original reference. It looks to me like Pin 28 is power for the injectors and Pin 37 is ecu power.
http://www.megamanual.com/v22manual/mwire.htm Look at the second drawing. The first drawing is for coil driven trigger.

I don't mean to be critical but you are not following the circuit correctly.

Bear with me and we will get there.......

Using the link that Matt provided (the second drawing)...........

Start at the battery + terminal
follow the red line, through the 20 amp fuse, to the arm of the main relay
the red line continues on the other side of the relay and goes to a junction
turn left and go through the 2 amp fuse to pin 28

I can tell you, without equivocation,that ALL v3 (and 2.2 I am almost sure) boards get their power on pin 28!

Hope that helps!

Ken

kjones6039 wrote:(and 2.2 I am almost sure)

I'm not even sure why I typed this, but to set the record straight, the above the above post applies to both v2.2 and v3 boards.

That is to say, that battery voltage is always applied to pin 28 on either board version.

My apologies for any confusion.

Ken

Ken and everyone else,
I finally got it. I was focused on the wrong relay and seeing only the circuit from the switch to relay to pin 37. Once I saw the other relay as the "Main" relay it sunk in.
Thanks for the help and patience.
David (8803)

I just ran my trigger test. The gauge responds to changes in the wheel rpm. The only problem is I know the wheel is turning less than 1000 rpm and the gauge reads 4000rpm. The gauge follows the changes in rpm of the wheel and is rock solid when the wheel is held at a steady rpm. How do I calibrate this? I believe the (2) trim pots only effect the shape of the input wave.
Any thoughts?