Have you checked Fuse 8 ?

 

Yes sorry, I have checked all of the fuses. They are not blown.

 

as i said that blown fuse powers the 4WABS module it goes to pin 20 of the module. the VSS goes through the module. thats why the VSS signal was missing. thats going to cause of the code. what he needs to do is find the issue of why the fuse blown. not trying to find why the VSS signal was lost

Huh? - look again, he said he checked all the fuses.

 

Also I get a code 452, don’t think I forgot anything else!

 

check Fuse 5 (E) in the power distribution box under the hood. it sends power to alot, including the MLPS for the reverse lights and 4WABS module which the VSS signal goes through

 

Didn’t know there was more fuses there, just checked and it was blown! Thanks for the help! Is there anything I need to fix before I put a new fuse in?

 

One thing you may want to look at is your instrument panel.

When I had my truck repainted I completely stripped everything from the outside of the truck so all the nooks and crannies would get new paint along with the rest of the truck. While I wa doing that I also removed the dash and repainted it. I left the dash off while it was going to be painted because there was going to be a new windshield put in as well.

When I went to drive it to the paint shop I noticed the same symptoms you are describing. Before stripping the truck down my transmission shifted just fine. After stripping it down it shifted very hard and very late. I did some testing and plugged the instrument panel back up and test drove it. Once I did my transmission shifted perfectly.
I don't have much knowledge on the relationship of the instrument panel and the engine/transmission, but I do know there is communication between the three while it is in operation. I would assume when the instrument panel is taken out of the link, part of the information needed to synchronize the operation of the engine and transmission is not available to run it properly.

I said all of that to suggest you look into the connection on your instrument panel. If it appears that it is connected properly I would still take the instrument cluster out and inspect the plug in connectors and the electrical contacts on the cluster. When I took mine out and inspected it, the contact surfaces were dingy and had mild corrosion on them. I took some 600 grit sandpaper and buffed them to a nice shiny clean before putting it all back together.

If your contacts are corroded you may not be getting a good enough connection for the cluster to communicate to the engine and transmission. You may want to rule that possibility out.

Just my 2 cents worth....


.

 

Ok awesome I’ll definitely give it a look over, thanks

 

dont worry about the cluster. the instrument cluster on the 92-96 has a PSOM for the speedometer. it converts the signal from the VSS for the EEC to use. the EEC uses it to know when to shift the transmission so if the cluster is unplugged, the VSS signal is missing and the truck wont shift untill it goes into limp mode. but the VSS also goes through the 4WABS module and if the module doesnt get power, the signal will be lost also

something caused the fuse to blow in the first place. everything in that diagram is related to that fuse so any of those are a potential issue for it to blow again. might be a good idea to do alittle snooping around those components and see if you can find a issue before it blows again in worse possible time. i would defiantly have several spare fuses till you find the issue.

 

Ok awesome, thanks I’ll see what I can find!

 

Here's the schematic of the VSS signal from the rear axle to the PCM. This has the pin numbers of the pins in the various connectors notice that the signal passes through C202, three times. The fact you are getting the code 452 means the PCM says you have lost the VSS signal at some time. I had a very intermittent VSS signal loss. By intermittent, I would get the full line pressure shifts once or twice A YEAR! After opening up the connectors to look for corroded pins, opening up splice S246, in frustration, I replaced the PSOM and ran a jumper wire from pin 7 on the PSOM to pin 3 on the PCM an inch or so from the connector. I used a product called liquid electrical tape on the PCM connector (C185) to insure the tap would be weatherproof. I left the rest of the wiring intact.
You may be able to help find where the signal is being lost. If your ABS light is on, you could be losing the signal from between the sensor in the rear axle and the ABS module. If you are getting the ABS light, and you suspect the ABS module, you can jumper around the ABS module, the ABS module pretty much just passes the analogue VSS signal through it.
If you are not getting the ABS light, but after changing the PSOM, you are still getting the code 452 and the speedometer is not working, you are losing the signal between the ABS module and the PSOM, there is about 8' of wire and the C202 connector between those two points. If you are handy with a multimeter and have some long leads, Ohm out the wiring between the ABS module and C202, then between C202 and the PSOM. (disconnect C202 when ohming between the points) Notice that Ohming the male pin 69 on C202, you should also check to see if the wire goes to ground. (Disconnect battery, ohm between the male pin 69 on C202 and a clean engine ground (and a clean chassis point to verify the the frame and chassis ground is good).
Also look at G200, and meter pin 18 on C202 to make sure that ground is good. (female pin 18 on C202)

1996 Ford Bronco '94 EVTM picture | SuperMotors.net

1996 Ford Bronco '94 EVTM picture | SuperMotors.net

 

as i said that blown fuse powers the 4WABS module it goes to pin 20 of the module. the VSS goes through the module. thats why the VSS signal was missing. thats going to cause of the code. what he needs to do is find the issue of why the fuse blown. not trying to find why the VSS signal was lost

 

Yo,
Mikey350,
Apparently, KidWithTruck hadn't checked all the fuses.
Yesterday @ 10:13 PM, Kingfish999 wrote, "check Fuse 5 (E) in the power distribution box under the hood. it sends power to alot, including the MLPS for the reverse lights and 4WABS module which the VSS signal goes through".

@ 0:23 PM KidWithTruck wrote, "Didn’t know there was more fuses there, just checked and it was blown! Thanks for the help! Is there anything I need to fix before I put a new fuse in?"
□□□ @KidWithTruck,
Back-Up Lamps Inoperative, Daytime Running Lamp (DRL) Inoperative, MIL On, Speedometer Inoperative, DTC 172, 173 or 41 for HO2S Failure in TSB 95-5-21 for 92-95 Bronco & F Series; On some vehicles the HO2S wires in the 12A690 (subassembly of the 14B060 battery cable) harness may become chafed.
Publication Date: MARCH 13, 1995
LIGHT TRUCK: 1992-1995 BRONCO, F-150-350 SERIES
ISSUE: On some vehicles the HO2S wires in the 12A690 (subassembly of the 14B060 battery cable) harness may become chafed and the vehicle could exhibit any one of the following conditions:
ABS light on
Speedometer inoperative
Back-up lamps inoperative
Daytime running lamps inoperative
Trailer battery charge relay inoperative
MIL on, displaying Codes: 172, 173 or 41 for HO2S failure
Inadvertent PCM Self-Test

ACTION: Replace the damaged wire harness and HO2S sensor. Refer to the following procedure for service details.

SERVICE PROCEDURE:
1. Disconnect negative battery cable.
2. Disconnect the solenoid terminal and positive battery cable from the starter.
3. Pull the cable downward to inspect the 12A690 harness for chafing, pinholes, etc. If necessary, remove the convolute and tape from the 12A690 harness located next to the lower RH side engine mount.
4. If the 12A690 harness is damaged, replace the 14B060 assembly (F5TZ-14300-EA) and the HO2S sensor (F4UZ-9F472-A).
5. ¥D9ZZ-14526-D).
6. Clear all codes stored in memory.
7. Retest and verify the concern has been resolved.

PART NUMBER - PART NAME
D9ZZ-14526-D Fuse - 15 Amp
F5TZ-14300-EA Harness Assembly
F4UZ-9F472-A HO2S Sensor

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION - DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - TIME
950521A - - - - - Replace Harness Assembly, HO2S Sensor And Fuse "E" (If Overloaded) - 0.7 Hr.
Depiction attached
by Ford via http://www.bbbind.com/free-tsb/

 

nice miesk, thats defiantly a good starting point. shame that harness seems to be unavailable but shouldn't be too hard to repair at least.

mikey, if you read his post jsut after i posted to check that fuse, he said he didn't know about the fuses in the power distribution box and that in fact that fuse was blown.

 

Cool - I read the first half dozen postings and (obviously) didn't see that one. I hope he's (and you) are not offended by my offering him more information than needed.

 

Hey guys thanks for all the advice. So I replaced the fuse and it’s driving great again. I have a reverse camera wired up that triggers when the backup lights go on. I saw that the wire had rubbed up against the side of the frame and the insulation on it was cut, so the wire was touching the frame. Could this be the culprit?

 

Yo KidWithTruck,

I see that fuse E does power the reverse lamps.
See attached wiring diagram.

Also, please fill out your Bronco Info with year, engine size, transmission type, transfer case type (manual or electric shift), locking hub type (automatic or manual) info & major mods such as a Lift, etc. for better responses.
Click User CP
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Ok cool. I’ll fill that out right now. Thanks for your help, and for other posts you’ve done I’ve used them a bunch in the past.