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Does anyone have access to the pcm pinout diagram for an 02 explorer? And possibly the gem module pinout for 98 ranger? I put a 2002 explorer sohc motor in my 98 ranger & im having shift issues im tring to find either the vss wire in the 02 explorer pcm or the vss wire in the 98 ranger gem? Thanks in advance to anyone that might be able to help
I don't have Explorer diagrams just Rangers and not a single diagram for all PCM pins
In 1998 the GEM gets the rear axle ABS VSS signal on pin 9, then sends out the corrected signal on Pin 1 to the speedometer, cruise, and in 1998 to the PCM pin 58
In 2001 and up the GEM didn't do this any more, the PCM was the source of the corrected speed signal, it used the OSS sensor and corrected it to 8,000PPM then sent that signal out on pin 68, to the speedometer and cruise
Thank you ron i was just looking for those before i read your last msg to actually make a new pin 58 wich i did & it unfortunately did not really make any difference with the 97 pcm? Idk maybe ther is smthen else goen on with the trans but whats weird is its different issues with the diff pcms? If i had the same issue no matter what pcm was in it i would be more willing to think it was a trans issue? So i thought i saw in one of your msgs to me that my trans should have another speed sensor above the shift linkage i think is where u said? Well i dont think mine does? The only one i see is the rear one the oss? Idk if that makes a difference? But overall it shifts alot better with the 02 pcm in it although without the 2 speed sensors hooked together it does throw that code? Idk maybe ill just try to find the right trans for this thing could i somehow convert the 02 explorer trans to work?
The sensor above the shift linkage was the ISS(intermediate shaft speed) sensor, NOT input shaft speed(ISS)
It was added to 5R55E in 2001
And from what I was reading the 2002 PCM needs that input to shift correctly, and no way to duplicate it since its an RPM signal used to calculate ratios between input shaft(engine RPMs) and output shaft RPMs(OSS)
The 1997 PCM for 4.0l SOHC and 5R55E should work with your setup
I think I posted the 1997 5R wiring in the other thread, if not here it is
The "Coast clutch solenoid" was changed to Shift solenoid 4(D), drawing still shows CCS, instead of SSD
In 1997 the PCM got the speed signal from yet another sensor, lol, on the tail shaft housing, this was a VSS but ran off the old speedometer gear on the tail shafts of all earlier vehicles, i.e. from speedometer cable days
This VSS had been used since the late 1980s for cruise control and speed signal for computer, speedometer still used the cable thru 1994, 1995 was first year for electric speedo in Ranger
So this VSS was set to do 8,000PPM as is, no conversion, so could run directly to electric speedo and computer
In 1998 the tail shaft VSS was removed, and rear axle VSS was used via the GEM module to do the conversion, so that the only real difference
There is a Ground wire on PCM pin 33 for speed sensor but that should already be hooked up
Do you have an OBD2 Live reader, can you see the speed signal that the computer sees at pin 58?
And the 1997 PCM is for a 5R55E not a 4R55E, that was the transition year for these transmission in explorers and rangers
The pin 33 on my 02 sohc harness has nothing in it? U say its a ground signal? How can i get that signal? Can i just run a ground into that pin or does it need to be from one of the speed sensors?
Yes any ground will do
If you look at the top left corner of the 1997 5R55E diagram you will see the VSS sensor and the Pink/orange wire, it is grounded, Splice 110 and Ground 104, and then runs to PCM pin 33
VSS sensor's generate their own AC Voltage, and AC voltage is a Sine Wave, so 1/2 the peaks are above 0volts and the other 1/2 below 0volts
Ford just uses 1/2 the waves, the + side of the Sine Wave, so 1/2 the pulses.
The 1997 PCM speed circuit inside may need that pin 33 ground I wouldn't think so but..............lol, I have been wrong alot in this conversion
When i swapped the motors i mixed up the trans dip sticks now idk which one goes to what trans? The one i have on it now is basically the only one i could get to fit back ther im assuming its the sohc dip stick? Well idk if im getting an accurate trans fluid level reading? When i first got done with the install i put about a half a quart in the trans just cuz i figured i had lost at least that but then after taking it for a drive it showed way over full so i sucked some out got it back down to the level mark i thought but just checked again & its way over full again? Could this be part of my problem? I saw on another forum or smthen someone who had used the sohc trans dip stick & said they made new cross hatch marks about a inch & a half up higher on the dip stick wich if thats the case i guess its just about right?
Also i do have a scanner i can read the vss with wich i have done & it reads correctly as far as i can tell? But im pretty sure it always has i dont understand what the problem could be now i have the right pcm? Should be wired right? But its basically doen the exact same thing its done since i first put the 97 pcm in even after switching the wires around to where they should be? Its pretty much made no difference at all i wonder if i got a bad pcm or smthen i have a buddy down the rd i just met who has a bunch of rangers & explorers maybe ill see if i can borrow the pcm off his 97 explorer? Just fyi idk if it makes any difference to u but basically when i take off from a dead stop in drive it will take off kinda normal but then right away it will idk almost try to shift too soon then kinda slam back into gear if i take off nice & slow its not that noticeable also it doesnt want to kick down at all & when it does it will kinda bog out for a sec then in will drop way down a couple gears but wont hold it long at all maybe 5 seconds then it will shift pretty hard its definitely not right compared to how it kicks down with the 02 explorer pcm that one it works pretty good except the 2nd to 3rd shift
The 2-3 shift thing with the 2002 PCM is from not having the ISS sensor
Your 1998 5R55E should have a value since its working
So maybe sell it and get a 2002 5R55E and use the 2002 PCM
The 4.0l SOHC was an option in 1997-2000 Explorers, standard engine was 4.0l OHV
But as far as I know they both used the 5R55E trans, the 4.0l SOHC should for sure
There could have been some 4R55E in 1997, the official change to 5R55E was 1998 model year
Would that dakota digital thing work somehow to read maybe the vss signal from the rearend & maybe wire it up to the iss sensor plug? Also about the trans dip stick do u know if using the dip stick from the sohc motor will give me an accurate reading for my original ohv trans? Or should i just drain it & find out what the trans fluid capacity is & just fill it back up off that? Btw i really do appreciate the help!
No, the Intermediate shaft speed(ISS) sensor won't have an equivalent RPM from an external source, even if you change RPMs with SGI-5E it won't match all situations
I.E. when driving the ratio selected in transmission changes the ISS RPMs, and when coasting the RPMs change again, where an external sensor doesn't do that.
What about reprogramming the 2002 PCM to use 1998 5R55E software, so no ISS sensor needed?
Do know about that or if it can even be done
i got a question for ya ron? I just bought another ranger last night off a buddy its an 01 automatic with the 3.0 motor & just for the heck of it i decided to see what would happen if i took the pcm, ignition, & pats transceiver out of the 01 & put it all in my 98 ive been having the shift issues with & somehow it shifts perfect! Do u have any idea how thats possible? & do u think i should try to find one from an 01 ranger with the 4.0 instead & see how that one does?
So i just came out to take some pics of the trans in the explorer to post it on c-list & i dont actually see an intermediate shaft speed sensor on it? At least the one up on the bell housing? I do see a speed sensor that my rangers trans doesnt have above the shift linkage & the one on the rear top the same one my rangers has? Also it definitely has a dip stick idk if that info changes anything but i thought id let ya know. So can u think of any reason not to use the pcm from a 3.0? I would have never considered using one but when i got this other truck i was just curious to see what would happen i havent driven much cuz i wasnt sure if i would hurt anything but the lil i did drive it shifted perfectly
Also the 01 ranger trans must have an iss sensor cuz the od light did start flashing & i got the p0791 code? But the trans shifts perfect! Thats weird i wonder if there is smthen wrong with the 02 pcm?
Ya i just was looking at some pics of the 5r55w & although the pic i saw had 3 sensors i see that the iss is the ine above the shift linkage. Every pic i see of my 98 ranger trans actually shows that stupid sensor but mine only has the one on the rear? Anyways for some reason the truck was running great with that 3.0 pcm but now its throwing a p0340 code for the cam sensor & its running like crap so i guess running a 01 ranger at least the 3.0 pcm isnt gonna work. I know the answer is just to swap my trans but im really trying to avoid having to do that there has got to be a way or a certain yr pcm i can get that will work
Yes, the 3.0l software in the 2001 PCM won't like running the 4.0l engine, 2001 3.0l should have had a 5R44E same trans smaller OD drum
3.0l uses a different style of cam sensor, on a tower in the old distributor hole, like the 4.0l OHV
The 4.0l SOHC uses a cam sensor on the valve cover
They are the same types of sensor, Variable Reluctance, 2 wire, that generate their own AC voltage And I would think they would have the same RPM "signal", one revolution per 2RPM, but may be more to it than that, and getting the P0340 would say yes there is a difference
My check gauges light is always on & has been since i got the ranger running with the new sohc motor (98 ranger) & i thought maybe it was because my gas gauge was stuck at full? but i just chaged the fuel gauge sending unit & my fuel gauge is now working but my check gauge light is still on? I did remove my cluster awhile back & i did pull the needles off & it was a pita to get them all working again or at least o thought they were working but my battery gauge & oil gauge when i start the truck both move up to about half way & then never move again until i shut the truck off even if i rev it up or while driving? Is this normal or did i mess smthen up when i pulled the needles off the cluster? I think tho before i even messed with the cluster the check gauge light was already on so idk what could be the issue? I would very much appreciate any advice anyone has to.try to figure this out thank u!
Oil gauge is an ON/OFF gauge, not actual oil pressure, so shouldn't move with RPM changes
Voltage gauge should also be stable with engine running, only slight change with RPMs, but should be lower BEFORE you start the engine, 12.5volts, then higher after startup 14volts
And needle should jump a bit, down and back up, when you turn on head lights or Fan to High
But Check Gauge light doesn't "look at" Volts, lol
Check Gauge is hooked to and activated by the Slosh module for the fuel level sender
And slosh module is also connected to Oil gauge and Temp gauge
So any of those 3 gauges(fuel, oil, temp) could cause check gauge light to come on
Or a failing slosh module
Is the fuel gauge stable, i.e. does it move up and down when you go around corners?
It shouldn't, thats what the slosh module is there to prevent
03-30-2019
