1N4001 trouble

[my0wn3ds]

I almost finished my MS-II v3.0
Engine Ford 5.0 code F, 1987, no MAF in stock

I have found the same post with answer, but not clearly understood it.

Q:

i'm sorry, i'm still very confused as to were i need to add this diode.. can anyone help?

A:

The best location is in the wiring harness itself, right at the IAC valve.

Assembling Guide:
You will also have to put a 1N4001 diode across the PWM Idle valve itself - the banded end goes to the 12 Volt supply, the non-banded end goes to the lead that goes to MegaSquirt (this diode is for flyback purposes on the idle valve)

Can anyone put this diode on this scheme?
http://www.DIYAutoTune.com/images/carte ... wiring.gif

Thanks and sorry for bad english)

[DonTZ125]

Like you quoted - right at the valve itself. The +12v supply is the orange lead to the valve; connect the banded end of the diode to the +12v pin of the valve. The non-banded end goes to the ground pin on the valve, connected to the yellow lead going back to the MS.

[Heribert]

My US$ 0,02´s worth, to be sure.
Hook everything up as per schematic . To positively identify the battery supply wire going to the PWM valve, unplug the valve and switch on the ignition.
Use a Voltmeter or simply a 12 V 5 W bulb. Connect one end of this to the chassis Probe the plug , the pin that gives you 12 V /where the lamp goes on is the +12V supply wire. Connect the banded end of the diode to this wire and the other end of the diode to the other wire in the PWM lead pair.
A bit of shrink tubing over the diode/wires will make it unobtrusive and nice!

Heribert

[my0wn3ds]

OK, i see)

Like on image below?

[DonTZ125]

That's it! Like Heribert said, be REAL sure you have the +12v and GND wires properly identified, or else you're basically installing a short circuit.

[my0wn3ds]

OK, got it
Thanks!

[my0wn3ds]

I have stock diode on my Idle speed solenoid.
Will it work with MS?

[Heribert]

Yes, it will.
Just make sure that you get the polarity right, the schematic in this thread says it all.

Best regards

Heribert

[my0wn3ds]

Anyway my Idle solenoid doesn't work... with stock diode or with 1N4001...

I'll try to replace it.