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Discussion Starter #1
i dont drive my bronco often but over the last year ive had to replace my speed sensor on the diff twice, i now have to replace it again.

could there be any reason why this is happening so frequent??
 

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yo 11,
I started a Defective Parts Listing here awhile ago; here is the skinny;

Vehicle Speed Sensor (VSS); also called RABS Sensor & Differential Speed Sensor (DSS) Defective; "... Anyway, the autozone VSS looks almost identical to the ford VSS. They are both now made of plastic. You have to look very closely to see minor differences. However, the magnet inside does not budge in the ford part, no rattling noise at all. The Autozone part rattles when shaken, ie. the magnet has room to move inside the plastic housing.[/b]It's was a big lesson for me. Wrong readings from the VSS can cause so much E4OD problems...erratic shifting, late shifting, hard shifting, feeling like it was in neutral, as well as engine cutting off at stop lights---Even if it registers correct readings on your speedometer..."
Source: by bkne40d at FSB

Vehicle Speed Sensor (VSS); also called RABS Sensor & Differential Speed Sensor (DSS) Defective; "... The VSS was probably working fine the entire time (except the DOA Vatozone ones)..."
by arse-sidewards at http://www.fullsizebronco.com/forum/...d.php?t=303217


VSS SENSOR for 4WABS in a 95; "I got it fixed. I bought another control module from a jy and it didnt fix it so I decided to replace place the new sensor I bought from O'Reilly with the orignal factory sensor for giggles and hit the freeway and to my surprise I had no needle waiver." by ants95bronco 11 JAN 2015

Get one from Ford dealer.
GL!
 

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Discussion Starter #4
What exactly was the original failure? What test did you use to ID the sensor as the problem? Was there visible damage to the original sensor? Did you keep the original? What brand replacement did you buy, and from where? Did it pass the same test that the original failed?
my transmission was not shifting into overdrive and it was shifting rather hard, so I bought a rebuilt tranny and installed it, same issue, my speedometer wasn't working so I went on ahead and replaced the speed sensor and low and behold the transmission shifted beautifully. then a few weeks later the speedometer stopped working and the trans shifted like garbage again

I purchased the sensor from oreilly auto parts, I did not keep the original
 

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yo 11,

Here is an excerpt of my post; http://fullsizebronco.com/forum/showthread.php?t=201477
"...Before buying any parts;
This problem could be caused by a # of things;
bad vehicle speed sensor (VSS) (also called ABS,, DSS sensor) on the 8.8 (rear differential)/ or corroded Connector/ wires inside connector;
or cruddy/damaged tone ring in the 8.8.
bad 4WABS Module - It is located below ws wiper fluid/coolant recovery tank. So, the connector can be corroded by leaking fluid
bad PSOM (Speedo)
bad wiring/shorts /connectors from VSS at firewall, at 4WABS Module and /or at PSOM and then onto the PCM

The locations of the connectors along the path from VSS to 4WABS and up to Instr Cluster & PSOM are;
C404 VSS On rear axle sensor (A7) Terminals: 02

C205 LH rear of engine compartment, in safety wall (Fire Wall) Terminals: 24 In-Line

C202F & M LH rear of engine compartment, in safety wall (A8) Terminal: 7 In-Line

C119 LH front corner of engine compartment on 4WABS control module (E10),Terminals: 40

O/LB to:
C202F & M LH rear of engine compartment, in safety wall (A8) Terminal: 7 In-Line

C252 Programmable Speedometer/Odometer Module (PSOM), Behind top LH side of I/P, on PSOM (A7) Terminal: 12 Color: B at Pins 4

LG/Y to Splice S107 Engine control sensor harness, from C119 near T/O to G101 (G101 RH side of Radiator support); to PSOM Pin 5
C202 F and M
and spliced to Ground G100 (BK)
G100 & G104 (tied together in diagram) G100 @ LH front of engine compartment, on upper radiator support

G100 Serves Component:
Fuel Pump Module
Inertia Fuel Shutoff
Misfire Sensor
Misfire Sensor Shield
Output Shaft Speed (OSS) Sensor
Powertrain Control Module (PCM), 5.0L

G200 Behind bottom of RH cowl panel
Serves Component:
Air Bag Diagnostic Monitor
Electronic Shift Control Module
Instrument Cluster
Programmable Speedometer/Odometer Module (PSOM)
Remote/Keyless Entry Module
Speed Control Servo/Amplifier Assembly

From PSOM Pin 7 (GY/BK) to Splice S246 Main harness, near T/O to speed control amplifier to
C185 PK/O @ PCM 5.0L Powertrain Control Module (PCM) LH side of safety wall, on powertrain control module (PCM) (C10) Terminal: 104 Color: GY
C185, 5.8L Powertrain Control Module (PCM) LH side of safety wall, on powertrain control module (PCM) (C10) Terminal: 104 Color: GY

C185 @PCM to C202 F and M
Splice 216 to Ground G200, Instrument Cluster ground is inside passenger side kick panel

and on to C185 @ PCM PIN 58 (GY/BK) and from Pin 46 to MLPS (TR) Pin 2
Verify PCM & MLPS wiring & Pin numbers using following WIRING DIAGRAMs by Ford via Steve83

http://www.supermotors.net/registry/media/95931_1



PSOM diagram for '96 Bronco. '93-95 similar by Ford via Steve83
=============

Odometer & Keyless Entry Inoperative; Fuse 8 Overload, Possible Short In Circuit 54 TSB 95-14-11 for 94-95 Bronco & F Series; also affected Inoperative Courtesy, Map, Engine & Glove Compartment, Dome, Vanity, & Cargo Lamps & Inoperative Power Mirrors
http://www.thedieselstop.com/faq/949...les/951411.pdf
===========

Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19 @ http://broncozone.com/topic/14269-co...&mode=threaded

The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.
Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accessories/lights, etc.

Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch.

Do Key On Engine Off (KOEO) portion first.

And Post them here according to:
KOEO
&
KOER
----------


..." READ MORE
 

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Discussion Starter #6
this is very helpful, ill definitely be utilizing this

thank you
 

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NMG2887 - I've been fighting issues with hard shift thru gears with delay, seems like misfires &/or rich running too, or thought could be transmission issue, but was guided by mech I took it too a couple yrs ago for code read and analysis that it was likely fuel injector related (I had already done basics of plug wires, cap, rotor & plugs). It seemed to do better immediately after plug changes on a couple of cylinders temporarily - so I thought and went with the injector strategy when I could get to it. This rig has been a rarely driven one for those 2 yrs now, and just wrapping up complete injector refurbish with my 16 yr old son. I haven't touched the transmission but have noticed a non-pressure leak in gen area of rear of engine or tranny. After reading about another Bronco for sale near me today and it mentioning Speed Sensor VSS (which I had not seen or heard about in my earlier research) change out I researched at lunch and saw your post. This sounds too similar to some of my issues (120K miles on 95 XL). I'd love to have Miesk5 or Steve83 come over for a few free beers and tear into it, but what were the results of your efforts - curious to see if resolved?
 
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