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2003 4.0l ranger v8 swap, need help with       #: 2580
 Moderated by: Mike69, MaDMaXX, Page:  First Page Previous Page  1  2   
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 Posted: Thu Dec 8th, 2022 07:06 pm
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JAMMAN

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 The heater circuit might be a fuse. It is a relatively high amperage fuse, it is PROBABLY marked "HEGO" . I would check where the O sensors are connected, see if a wire is pulled.

I'm pretty sure the upstream and downstream are the exact same sensor, perhaps with different length connectors. Borrow one of your downstreams and switch them out.

If you can get them out.


The thing is... none of those would cause it to run like it does. You're missing something very simple I bet like a one wire thing.

A MAP sensor would do that too... I don't think they started map sensors till 2001.


I'm kinda lost without 2 full manuals.



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 Posted: Fri Dec 9th, 2022 03:52 pm
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showdotrun
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 went ahead and checked my plug wire order, condition, and made sure i was getting spark at each cylinder. unplugging each cylinder one by one resulted in an obvious change, so pretty sure those are in order.

Checked for a vacuum leak, sprayed all the possible leakage points to see if there was any change in idle, nothing changed.

hope to be able to check fuel pressure soon.
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 Posted: Fri Mar 24th, 2023 03:03 pm
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showdotrun
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 checked fuel pressure finally,

25psi...... should be around 60. replaced fuel pump and filter, now truck runs great.

......however:

transmission will not shift.

have the following codes for the transmission:


P1747 refers to a transmission issue.
The PCM has detected
a malfunction within the EPC
(Electronic Pressure Circuit) circuit.

P0750 indicates a malfunction
for a transmission shift solenoid.

p0755
indicates that there is a problem with the
transmission's shift solenoid B

p0743
Low transmission fluid level
Faulty Torque Converter Clutch (TCC) Solenoid

transmission fluid is where it should be. i think i have a power delivery issue to the transmission itself, hince all the codes. Transmission was fine when i pulled it from the mountaineer.

I unplugged the transmission plug on the right side of the trans, and that caused the O/D light to blink, so i think im getting power there. 
Can't manually shift from 1st to 2nd either. just sits in 1st.
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 Posted: Sat Mar 25th, 2023 09:10 pm
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JAMMAN

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 Hi, I re read the entire thread to get a feel for it. Really glad you checked the fuel pressure!

OK I read you re used the engine bay harness. If this means from the ECU to the plugs in the engine bay (one for the chassis one for the transmission) there is a wiring difference in the plug for the transmission. Again I do not have a diagram for this vehicle but the trans is simply not getting the signal to shift and it looks like nothing is getting back to the ECU.

If you used the mounty plug going into the ECU and used the plug going in to the trans it should have worked.

Again your next step needs to be e-bay, an electrical diagram for the 03 ranger and the 00 mounty. Somewhere the trans isn't getting the signals it needs OR can't report those signals back to the ECU to let the ECU know it is OK to go on to the next range.

By the time this is done you will be a wiring guru!



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 Posted: Fri Mar 31st, 2023 10:02 pm
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showdotrun
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 I've found all the wiring diagrams for both online, so i've been pulling info from each for the last week or so.

Everything should have worked though, i used the ECU, engine harness and transmission harness from the mounty, I kept the engine bay fuse box from the ranger though, and i think that might be where my problem is. 

Hopefully i'll start digging into wiring this coming week now that weather has changed.
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 Posted: Wed Apr 5th, 2023 03:34 pm
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410customs

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 Cool build!! Okay so let's start off with a couple of things 
The trans codes

96-97.5 4r70w wiring is different from 98-01 4r70w  at the solenoid s
What year did your new trans harness come from? It must be from a 98-01 5.0 since you are using a 2000 4r70w

If your harness is from a 96-97.5 then you will have some changes to make at the white plug passenger side of transmission behind the heat guard. Access to this plug and wires is easiest through the floor
Plate

Your
Pcm
Cannot talk to the shift solenoids and control the epc solenoid you must solve this before trans will work

We can get rid of all codes here even the Evap ones lol



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 Posted: Sun Apr 9th, 2023 06:04 pm
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showdotrun
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 Hey Idahome, thanks for popping in. 

The engine/trans/and engine harness/ trans harness are all from the same mountaineer, which all worked before i pulled it, so there shouldnt be any issue with the wiring.
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 Posted: Mon Apr 10th, 2023 10:54 pm
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410customs

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 Oh I see you used the junk yard harness parts to re pin your original broken plug! Sorry had to read it again! Staying tuned



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 Posted: Thu Apr 13th, 2023 05:06 pm
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showdotrun
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 i unpinned the harness i replaced the plug on, and just used the wiring diagram to plug the pins directly in, as a test. 

Still throwing all the same codes, but now i have a second gear..... only shifting from drive to 2nd. no change from 1st to 2nd.
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 Posted: Wed May 24th, 2023 03:03 am
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showdotrun
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 Finally done some more research. i found i did not have 12v power on pin 4 on the 10 pin connector that plugs into the right side of the transmission, the book calls this C180.

I spliced into the wire at the engine 42 pin connector, and fed it 12v directly from the battery, just for testing purposes. 

truck runs better, only throws 1 code instead of 4.

P0755 "Shift Solenoid B". 

will shift from 1st to 2nd, but never goes into 3rd, even starts to just free rev after that. I assume this is because I don't have a speed signal, as i haven't found a way to convert the 00 VSS signal to the OSS version the 03 ranger expects. does this seem correct?
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