Need EEC pinout for 1990 Lincoln Town Car

[Crownvicman289]

Yes, the bastard child 1990 TC. I pulled my donor harness from one and there are a number of wires that aren't identified on www.fordfuelinjection.com. I've tried searching and will continue to do so, but assuming I don't find what I'm after does anyone have access to a EEC pinout to the 1990 LTC?

[gadget73]

the unidentified wires are almost definitely cruise control related. If you can find one for a Mark VII, its probably the same. I unfortunately don't have a 90 TC manual here but i'd bet 90 and 91 Vic / GMQ have the same extra wires as well.

If this is for your 92, and assuming its the same as the 92 grand marq, the only extra wires you actually have use for are the VSS inputs. The cruise control wiring I just didn't bother hooking up at all. The car has stand-alone cruise, much to my utter amazement.

[Crownvicman289]

Funny story here, this SD LTC Harness doesn't match the pinouts for the SD CV/GM harnesses listed on the above website, but according to a pinout provided on CVN, it matches wire colors and all the MAF (CA?) LTC minus the fact that there was no MAF installed on the vehicle. Pins 8 and 44 are data bus wires that don't exist on the lopo SD and EFI SD/88-93MAF cars. Only pins 28, 34, and 39 are not positively identified, but in the GM 5.0HO swap thread an EVTM page indicated that there were 6 wires on the EEC all for the cruise control. I removed the 3 with the plug for the servo leaving only the aforementioned 3 wires. I'm depinning them and not going to lose any sleep over it. Swapping to the 94-95 MAF Mustang EEC from the '87 SD EEC will be simple since the extra wires needed already exist in the Lincoln harness. I'll pull the vic in the garage tomorrow and start swapping, I hope to set some sort of speed record in getting this running. ID'ing the wires on the car ought to be pretty simple since I can follow them all the way into the car. Since the ABS computer is pulled, I had a few unused plugs that I zip tied out of the way. I'm really hoping one of them is a plug for that variable assist solenoid, that'd just be icing on the cake. I should've known all along that the cruise was standalone since it works with my carb which kicks ass.

[gadget73]

34 is fuel flow output to the tripminder / digital dash for instant fuel economy readout
speed control wires are: 2, 3,6,35,38,39,41 50
2 is brake on/off
3 is vss input (you kinda want this one)
6 is tied into the gas gauge somehow (Mark VII manual, no clue if you have this one or what it even does)
39 and 50 go to the buttons on the wheel
35, 38, 41 go to the cruise servo


I could have sworn I'd grabbed the 92 EVTM to get you the plug ID info but it didn't make it home. I guess I laid it down in the shop to do something else, and forgot to throw it in the car when I left. I seem to recall the variable assist stuff coming out of one of the plugs that the ignition and other wiring feeds from. I think the temperature gauge wiring is also in one of those, and the check engine light wire and maybe the low oil level sender (which isn't on this particular engine) and the red oil lamp of death wiring. I also seem to remember one or two completely unused connectors that are now stuffed down there in the corner. They used to go to stuff, but no longer. One was power to the ECM, but I dont know what the other was. There are a lot of wires that go nowhere in the other connectors as well. Unfortunately Ford doesn't give connector pinouts for connectors that don't end at a device, so basically the only way I figured out what went where was to go through that stupid evtm page by page and look for mentions of the connectors, then determine what actually passed through them.

[FatNasty]

You might have already gotten the info you need, but here are the pinouts for '90 CV and GM anyways. May be some help.

[Crownvicman289]

Yeah, pin 5 is my brake switch not pin 2 like every other EEC. I actually have to relocate it to 2 for the swap. 11, 35, and 51 were the servo. 1990 LTC = morphadite bastard. Still no ID for pin 28, I think it's safe to assume cruise control. Those EVTM pages give me peace of mind.

[gadget73]

yeah i've never worked on a 90 so I've never studied their wiring. Makes perfect sense that since its a Lincoln, it would have goofy crap.

[gadget73]

pics of the Grand Marq connectors and some of the adapter harness

The black side of the fuel pump connector is on the 91 harness, the grey side is factory to the 92

I have no idea what function the single wire plug or that wire thats pulled out of the trans harness are for. I think the trans harness one has something to do with the starting circuit feed, but I'm not positive. The starting circuit is the original 92 wiring, but theres a tap in there somewhere to feed the 5.0 ECM to make it happier. It didn't start nicely without that hookup, and I think they don't give codes without the neutral safety switch being hooked up properly.

The round black plug and the big square plug are both 4.6 original. I think the square one has all the instrumentation wiring for the temp gauge, oil pressure sender, probably the VAS, stuff like that. I forget what all is in the round plug but its probably the key-on power circuitry.

[Crownvicman289]

I've identified all but 2 wires on the Crown Vic plugs. They're both on that small black plug. One is plain blue and the other yellow with a green stripe and both lead to the square engine harness plug. Since my engine harness is long gone, this poses a bit of a challenge. I suspect they originate from the fuse/relay box near the battery, so tomorrow (actually today) when I get home from work I'll shoot for power and see if I can't get lucky. Do you know offhand what 5.0 HO vehicles might have had an active pin 34? Even though I have a standalone cruise computer, I'm thinking if the Mark VII computer can run a tripminder/economy gauge I might go that route. I've got the digidash in my car and I'd like to see that economy thingie work again.

[gadget73]

mark 7 and mass air mustangs. I have an A9M and the tripminder I cobbled in works.

[Crownvicman289]

I do have the EEC from a '94 Stang that I aspire to change over to. I also have the MAF for it, just missing the black TFI module. I know it's got the data + and - wires as well whatever they do. The MAF part number starts with F2 which makes me wonder if it's not the same MAF they used on the 4.6's. I plan to swap to the MAF later in anticipation of the P engine, so this might pan out rather nicely.

[Crownvicman289]

I picked up the black remote module today with heatsink and pigtail, I'm going to see about mounting it on the driver's fender like the 4.6 had. I finally figured out my last 2 wires when I went back for the variable assist PS valve pigtail that I forgot the last time. The wire colors were the same and it makes perfect sense! I forgot all about that damn thing even being a factor. Tomorrow I'm going to solder up the 92 connectors on the LTC harness, relocate the TFI module, see about installing a different pigtail on the distributor for the hall sensor, and repin the EEC plug. I don't think I can wrap it up just yet because I have a discrepancy with the O2 ground on the EEC. One source claims pin 49 to be a ground and another claims it's a transmission oil temp sensor.

[gadget73]

is the 94 eec for a manual or an auto? I think a 94 had an aode, which might give you some crap since you're running a 5 speed. I dont think the aode had a temp sensor in it anyway. I'm quite certain the T5 does not have a temperature sensor.

[Crownvicman289]

Yeah, I've been raping google since last night. I'm hitting the junkyard in about 20 minutes to snag up an HO EEC from a 93 T-bird (still had an AOD). That's got the data bus wires and an operational pin 34 fuel flow data pin and uses the same MAF as the 94-95 Mustang, same as 92-94 Panthers. There's dick for software support on it, but the extent of my "build" shouldn't exceed its capabilities. I found out last night that the 94-95 Stang has a TAB/TAD wire in pin 34 so fuck that. I might even grab the distributor as well since that car had a remote mounted TFI module.

[gadget73]

I'm guessing you're using those ECMs since they are available and the A9* models cost an arm and a leg? From what I've been told, the tune for the SN95 and the Tbird/Couger HO brains is a little on the lean side and generally crappy but thats hearsay. I've never really considered using one just because I was too lazy to do all the harness re-pinning required for it.