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squirrelhunter
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I haven't checked the gauges really but I know the check engine and airbag lights work and the buzzer for the key in the ignition and the door open. It doesn't have a security system. I'll check tomorrow. I've got a big circle connector between the steering column and fender where a bunch of wires go in from the engine and fuse box in the engine compartment but that's the only big connector out there that I've seen. Once it's inside it splits up and goes multiple directions but with the steering column,gauge cluster and all the a/c duct work I can't really tell where all it goes until I get more out of it. I'll probably have to take it about all out anyway to find the short,there's a lot of wires. It's an automatic and the electric shift is on the fuse too in addition to the cluster.

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Posted: Sun Dec 13th, 2020 10:05 am

52^nd Post

squirrelhunter
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Yeah the gauges work.

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Posted: Sun Dec 13th, 2020 11:14 am

53^rd Post

Idahome

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try unplug one thing at a time until the fuse no longer blows
Possibly the ESOF computer/brain

The wires go through whats called the BWP, or the big white plug
this was used 89-94 on these trucks as the wiring through firewall connector.
The short is usually inside a component like the esof computer or right at the back of the fuse panel
dead short can be really fun to find under there! Easiest way to start is just unplug things on that circuit until the fuse no longer blows, sometimes you win and the culprit shows itself right away!

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Posted: Sun Dec 13th, 2020 11:41 am

54^th Post

squirrelhunter
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I was planning on unplugging things until the short went away. I figured it was probably in a component,probably the PCM. The thing is,the short isn't blowing any fuses,they're all good,the short is only 2v. Maybe it's suppose to be that way but I doubt it,I've never seen voltage to both sides of a fuse before,but I don't know a lot about the computer systems either. What do you mean by the ESOF computer,the PCM?

Last edited on Sun Dec 13th, 2020 11:42 am by squirrelhunter

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Posted: Sun Dec 13th, 2020 11:45 am

55^th Post

Idahome

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Sorry, ESOF is Electronic Shift On the Fly = 4x4 computer
the 4x4 computer is on that 15 amp fuse so it is suspect

it is common to have some voltage on both sides of a fuse with the key on, I have seen up to 5v on some systems like the fuel pump

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Posted: Sun Dec 13th, 2020 12:25 pm

56^th Post

squirrelhunter
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Oh I understand now. Now I wonder where that computer would be or what it would look like. Well if it's suppose to be like that,maybe that's not the problem then. Now I'm back to square 1. I wish I knew more about these stupid computer systems. I found the PCM,it's under the hood on the driver's side between the big circle connector and the inner fender well,down on the bottom. I'll post a picture once I get it uploaded. Would the shift module be on the transfer case or could it be anywhere? It seems like I read it was close to the push button for it but I'm not sure,I'll have to look into that. I bet it's the little module thing I found close to the steering column,I'll follow the wires and see.

Last edited on Sun Dec 13th, 2020 12:39 pm by squirrelhunter

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Posted: Sun Dec 13th, 2020 12:31 pm

57^th Post

squirrelhunter
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Posted: Sun Dec 13th, 2020 01:18 pm

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Idahome

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Yes that is the PCM on the 94 ranger
powertrain control module or EEC (electronic engine control)
That controls the engine and trans
However it is not on that fuse circuit

We are looking for the ESOF, the 4x4 control module
In 94 ranger I believe it is in the drivers rear cab corner behind jumper seat looks like this
http://www.therangerstation.com/tech_library/images/4wd_module2.JPG

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squirrelhunter

Posted: Sun Dec 13th, 2020 02:10 pm

59^th Post

squirrelhunter
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Oh ok,I remember,I saw that yesterday.. I figured everything having to do with the PCM was on the EEC fuse too. Isn't the 4x4 system run through the PCM or is it run through the EEC system only? What's on the EEC fuse then? The short I'm talking about is between the EEC fuse and the fuse I showed on the fuse box for the Electronic shift. I'm getting confused but that don't take much lol. I thought the PCM was the main computer for the EEC system. I'm really confused on this whole computerized vehicle situation,bring me back to the 70s. I thought the codes came from the PCM too,which I'm not getting any codes at all.
Is the diode in the engine compartment fuse box removable and could it have anything to do with it?

Last edited on Sun Dec 13th, 2020 03:53 pm by squirrelhunter

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Posted: Sun Dec 13th, 2020 07:10 pm

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Idahome

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the diode inside the under hood power distribution box is important,
yes it comes out, but it needs to be there
Diode makes sure power can only flow one direction

The EEC fuse is for the EEC relay and basically this powers up the trucks computer when you turn the key to on The eec fuse and relay are located in the under hood fuse box
You turn the key to on the ignition switch in your steering column sends power to the eec relay. The eec relay then clicks on and powers up the trucks engine computer (eec or pcm)

The 4x4 electronic shift computer in 94 is independent of EEC system and is fed by the 15 amp fuse circled earlier in from the interior fuse panel

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Posted: Sun Dec 13th, 2020 07:52 pm

61^st Post

squirrelhunter
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So then if I'm getting 2 volts at the EEC fuse when the 15 amp fuse for the 4x4 electronic shift computer is in,that definitely means there's a short somewhere right? Would that be enough to fry the PCM? But if there's a short in the 4x4 Electronic shift computer,with it being independent of the EEC,how is it getting to the EEC unless there's a short somewhere else,like maybe the ignition switch or a wiring harness instead of the 4x4 computer?
I'll see what happens when I unplug the 4x4 computer dash cluster and go from there.
I'll try checking the Diode too just to make sure it's ok.

Last edited on Sun Dec 13th, 2020 07:58 pm by squirrelhunter

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Posted: Fri Dec 18th, 2020 12:22 pm

62^nd Post

Idahome

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I don't think that automatically means you have a short
I believe the PCM has some residual power that you will find throughout the wiring harness depending on how sensitive your meter is
Don't quote me on that but any millivolts or volts under like 2, I don't worry about usually..... you could try disconnecting the pcm and see if you still have those 2 volts just for curiosity sake
The Short is most likely on one the protected circuits on that fuse, or on the power feed side of that fuse (the interior fuse panel gets its power from the under hood fuse box and some from the ignition switch)

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Posted: Fri Dec 18th, 2020 02:19 pm

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squirrelhunter
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Well if 2 volts isn't anything to worry about,I'll still unplug the PCM and see what happens,plus check the interior fuse box for voltage on both fuse sides like I did the box under the hood and see what it shows. I just don't want to spend a couple hundred on a new PCM,just to have it burn up as soon as I plug it in. I know they can just go bad but I also know other things can go bad and cause them to go bad too.

Last edited on Fri Dec 18th, 2020 02:29 pm by squirrelhunter

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Posted: Tue Dec 22nd, 2020 08:48 pm

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squirrelhunter
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I got the PCM out but everybody's saying they can't check it out of the vehicle so I'm going to put it all back together and tow it over to a garage a couple miles away and let him diagnose it,he use to work at a Ford garage and I've known him his whole life.

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Posted: Tue Jan 5th, 2021 04:41 pm

65^th Post

squirrelhunter
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Last edited on Tue Jan 5th, 2021 05:32 pm by squirrelhunter

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Posted: Wed Jan 6th, 2021 10:05 pm

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VelociRanger
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How is this going?

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1983 Ranger, reluctantly taking apart. Donor/project vehicle.

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Posted: Thu Jan 7th, 2021 09:00 am

67^th Post

squirrelhunter
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I'm waiting on my son to come over to help me pull it over to Randy's. In the meantime I found out my right rear turn signal isn't working,bad socket, it'll be here this morning.

Last edited on Thu Jan 7th, 2021 09:01 am by squirrelhunter

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Posted: Thu Jan 7th, 2021 03:02 pm

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VelociRanger
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Good news. Hopefully it's nothing major.

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Posted: Thu Jan 7th, 2021 06:55 pm

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squirrelhunter
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It's just a bad socket,a loose connection. The bad news will probably come after Randy finds out why the PCM isn't giving codes and the fuel pump's not working :hammer

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Posted: Fri Jan 8th, 2021 09:41 am

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Idahome

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fuel pump fuse and relay
Inertia switch

Those are easy enough to test!
Keep us posted on what they find at Randy's!!

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Posted: Fri Jan 8th, 2021 04:42 pm

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squirrelhunter
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All of those are ok,there's something wrong with the Computer system,it won't even give codes anymore. I'll let you all know what Randy finds out.

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Posted: Wed Jan 20th, 2021 12:54 pm

72^nd Post

squirrelhunter
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Randy called and I couldn't understand him at first,but something about the computer's not getting power and grounding right through 1 of the pins so the first thing he needs to do is get a computer. None of the parts stores has 1 available. He said there's a place in Ft. Wayne that can rebuild them for around $300 so that's probably what we'll have to do. He's going to call some junk yards and see if he can get a used 1 somewhere.
More updates to come.

P.S. He couldn't find 1 so he's sending it in to be rebuilt.

Last edited on Wed Jan 20th, 2021 04:59 pm by squirrelhunter

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Posted: Tue Jan 26th, 2021 04:20 pm

73^rd Post

squirrelhunter
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Here's the update. I guess I didn't have the inertia switch right or it tripped when I put it back in,there was also a couple of wires he had to fix somehow,but it was mainly just the computer. It's all fixed and running good. Only cost me $597.62,not bad I didn't think.

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Posted: Tue Jan 26th, 2021 05:21 pm

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VelociRanger
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Good news it's working. Yeah, that price doesn't seem too bad. PCM work/diagnosis is expensive.

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Posted: Tue Jan 26th, 2021 09:03 pm

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squirrelhunter
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To rebuild the PCM was $300 of it and he did it in 24 hours.

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