Engine Codes 511, 212, And 412. Do I Need An Exorcist Or A Mechanic?

[rockandrollfrankie]

Okay, so I did some debugging and here's what I did.

1. Disconnected the harness from the ignition module, distributor, and both at the coil.
2. Checked for continuity to ground on all pins of the ignition module connector.
3. Seeing ground at the red/green wire, which is labeled "RUN" per the diagram. (see pic 1)
   
4. Not seeing ground at the black wire, which is labeled "IGN GND" per the diagram. Maybe my problem?
5. Checked continuity from the IGM SPOUT pin to the EEC SPOUT pin. We're good there.

On step 3, I'm pretty sure I'm getting continuity to ground due to the radio interference capacitor (see pic 2). Am I right? Is the black wire supposed to go to ground? I figured it would, but no beep from the Fluke.

Pic 1:


Pic 2:


Here's a diagram of the ignition module circuit I was using. Is it even correct?

 

[rockandrollfrankie]

P.S. - I pulled the EEC to check the pins and there's definitely a chip in the thing. Kinda hanging outta the back with duct tape over it. What the hell!

 

[rockandrollfrankie]

Wait a minute! Is the "radio interference capacitor" that cap that's attached to the side of the coil? I disconnected that, so in theory, it shouldn't have affected my test if that's it. I think I found the problem.

 

[Willie_B]

Brand new here and noticed you folks talking electrical and I'm needing some serious help with the electrical on an 03 gt. Can you folks help guide me in the right direction?

 

[General karthief]

Brand new here and noticed you folks talking electrical and I'm needing some serious help with the electrical on an 03 gt. Can you folks help guide me in the right direction?

Go to the 96-2004 sn95 tech forums and post your symptoms there and those people with same model stangs will be glad to help ya,
And welcome to stangnet

 

[rockandrollfrankie]

Yeah, I did a little digging and it looks like that cap on the side of the coil is the RFI cap. I'm 99% sure I shouldn't see ground on that red/green wire with it disconnected, but before I start digging wires out of harnesses can someone verify that for me? Also should I see ground on that black wire?

 

[General karthief]

Pics?

 

[rockandrollfrankie]

I got it! Well, almost!

1. Tested for ground at fuse 18 under the dash. Totally got continuity.
2. Unplugged the large breakout connector on the passenger side. No longer getting ground at the ICM, coil, distributor, or RFI cap.
3. Unplugged the connector near the EEC that has the red/green wire in it. No longer getting ground at the fuse block.
4. Checked for ground along the common wire between the breakout connector and the connector near the EEC. There it is!

I have to assume that some stretch of wire there rubbed itself raw and it touching metal. Now I just have to find it! But first, it's pizza time.

 

[rockandrollfrankie]

I get ground here:


And here:


Gotta be a break in that red/green wire between the two.

 

[rockandrollfrankie]

Okay, getting even closer, but I need some help. Where does this connector go? I unhooked it, and ground follows it up into the abyss. Am I looking at removing the fender?




That's behind the glove box, against the passenger side of the car.

 

[Mustang5L5]

Making progress. Unfortunately I'm not privy as to where SN95 wiring runs

However...

https://www.ebay.com/itm/252921601934

 

[General karthief]

Have you looked at veryuseful.com for what you need?

 

[rockandrollfrankie]

I have electrical schematics, but I need to know physically where that wiring goes. Do I pull the fender or the airbag? Ha!

 

[rockandrollfrankie]

Hell, does anybody have a pic of an SN95 with the passenger fender off?

 

[General karthief]

You could pull the wheel and the inner panel out rather than the fender, found one pic of that area but no wiring to anything in there just the purge canister, look like harness came in, split in two then back out. Sorry not much help.

 

[rockandrollfrankie]

Okay, I'm going for the airbag then! It has to go through the firewall somewhere, right?

 

[rockandrollfrankie]

What's the purge canister? That's part of the EGR system right?

 

[General karthief]

Charcoal canister that is hooked to fuel tank throught manifold vacuum, not sure about location on a 94-5 model fox cars are on the passenger side under air box with vacuum hose hooked to a port in the front of upper manifold behind distributor.

 

[rockandrollfrankie]

Oh okay! That's long gone. I can see in the fender there's some vacuum breakout that used to be attached to the EGR inlet on the back of the intake manifold. That ain't hooked up anymore either. Silly 95 emissions crap.

 

[rockandrollfrankie]

Holy crap! Okay, so I just took another stab at it after finding more harnesses. I can actually trace ground back to my fuse block! If I pull fuse 18, which feeds the ignition, I get continuity to ground at the hot side of the fuse. Here's where it gets weird, if I KOEO I get 12v there. Maybe I'm too old school, but shouldn't ignition either be no volts or volts, not ground or volts? Is my ignition switch busted?