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94'bronco a/t the speedometer is surging,abs lite is on,tranny is shiftin funny...yes replaced speed sencer, tone ring. all but the psom in dash.iam runnin 35''an 4.56 gears with detrot lockers.ive researched this problem. someone talked about the abs module not sure thanks:banghead
 

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Welcome to FSB :twotu:


You have a couple issues here. One, it sounds like you've got it narrowed down to the ABS module. Here is a link<----click to show you how to bypass the module to rule that out.

Also, with running 35's, you need to program your PSOM. To learn how, click here. This will improve your shift patterns and calibate your speedo due to the 35 inch tires.
 

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penis
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O.K.
Start here Remove, clean, replace the VSS. Located on the top of the rear diff. there is a plug going to it.
Pull codes list them here,
see if the needle stops bouncing
KOEO (Key On Engine Off) and a KOER Key On Engine Running)
More then likely replacing the VSS (vechicle speed sensor may also be called a(n) ABS sensor) will resolve the bouncey speedo issue Depending on how long it has been in the rear diff. you may need to force it a little to get it out.
To pull codes is simple for the self test just take a piece of wire and jump from the grey connector to the lead in the pic, (sorry about the quality)

Below is on how to read the codes
Wire from the upper terminal lead to the grey connection will start a self test of the ECU, you will get a code 111 for the KOEO test.
Here is how you preform the KOER test:
The first set of flashes you will see is the Engine ID code. For gasoline engines, the engine ID code equals half the number of cylinders (4 pulses = 8 cylinders). Diesel engines have an ID code of 5 flashes. These codes are used to verify the proper PCM is installed and that the KOER Test has begun.
7. After the engine ID code you need to test a few items for the computer. You’re vehicle might not have any or all of these items to test.
a. Brake On/Off (BOO) circuit, the brake pedal MUST be depressed for 1 second and released.
b. Power Steering Pressure (PSP) switch, quickly jerk the steering wheel one-half turn and released. Power Steering Pressure Switch (5.0L Without E4OD Only); The Power Steering Pressure Switch signals the EEC Module when power steering pressure exceeds 350 psi ±50. The engine then increases idle speed to compensate for the additional load. It appears the switch was deleted from the '94 model year. It only shows up in the diagrams until '93. the switch is directly above the steering box." Source: by Sportruk
c. Transmission Control Switch (TCS) for the E4OD or 4R70W auto transmission, press the O/D off button 2 times, turning it ON and OFF.
8. The computer will begin to test many components; you will hear the idle change watch the check engine light closely.
9. After many tests the computer will flash once, indicating a Dynamic Response test. This single flash is prompting you briefly push the gas pedal all the way down (do not over rev the engine).
10. After a little while the check engine light will start flashing codes at you.
11. After you�ve gotten all the codes turn the engine off, and remove the ground wire from the STI.
 

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penis
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Use the search feature for one, It is EGR related most people from what I have read said clean it and everything was fine, Did you do a KOEO and a KOER test or just one? That doesn't explaing the bouncing speedo look in the noob section I have several post there look for the one relating to bouncing speedo I gave some good info about what was going on.
 

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yo,

Here is dabranco's PSOM Problem Question;
http://fullsizebronco.com/forum/showthread.php?t=176386

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Did you ever try what sackman9975 advised to Rule-Out the 4WABS Control Module (as the fault)?

And this is what I previously posted here and over-wrote
there could be other factors causing the PSOM needle to jump, ABS AMBER light, Hard erratic E4OD shifts; such as;
a damaged ABS tone ring/or shavings in the rear differential
a bad ABS (also called VSS) Sensor or it/s connector/wiring (corroded connections/conductors)
& other connectors along da path thru the 4WABS Control Module & then up to da PSOM (Speedo/odometer) and then to the EEC/Cruise Control/ Overhead Console
& of course a faulty PSOM; sometimes due to a loose or bad solder joint inside

My ABS Module was fried and caused the PSOM needle to jump wildly, tranny to downshift suddenly and AMBER ABS light to turn on; also had a DTC and check engine light
so do what Sackman advised.

DTC 311 - Thermactor air system inoperable
There are several components that make up this system. The initial component is the smog pump. The first checks I would make are the hoses and plumbing from the smog pump back to the diverter valve (behind the pass. cylinder head) and then on to the crossover pipe at the back of the heads and down to the catalytic converter. The check valves that are at the center of the cross over pipe and the top of the metal tube from the cat are often the culprits as they can and do snap in half as the get old. If the plumbing looks to be in good order we can discuss the slightly more complicated aspects of the system.

The diverter valve also has two vacuum lines running to it. Make certain they are in place and intact. (Computer needs to be able to control the flow of fresh air by the Thermactor system
Visually inspect vacuum lines for disconnects in the AIR system. Visually inspect for proper vacuum line routing. Refer to VECI decal. Visually inspect Air Pump for broken or loose Air Pump Belt. -------


TAB/TAD Solenoid Location pic
Source: by Ryan M (Fireguy50) at fordfuelinjection.com
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Overview & Diagram; "...Secondary Air Injection system consists of a belt-driven Air Pump, single or dual AIR Diverter (AIRD) valve(s), an AIR Bypass (AIRB) valve, and AIR Bypass solenoids, air silencer/filter, Powertrain Control Module and connecting wires and vacuum hoses. The Belt-Driven Secondary Air Injection system provides either upstream/bypass air or upstream/downstream/bypass air. The number of these system configurations vary significantly with AIR Bypass (AIRB) and AIR Diverter (AIRD) valve combinations (Figure 179). 2. The PCM provides one or more signals that enable one or more AIR Bypass solenoids. 3. The AIR Bypass solenoids control one or more AIR Bypass valves and/or AIR Bypass Diverter Valves in order to route secondary air depending upon the specific configuration. 4. The belt-driven Air Pump is operational any time the engine is running.
The 2ndry air system is known to fail in a wide variety of ways. The check valves that prevent hot exhaust from entering the rubber hoses age, rust, leak, & crack open melting the plastic TAB & TAD valves, creating exhaust leaks that can damage other components, raising exhaust oxygen levels (setting lean codes or rich adaptive limit codes), and making rattling noises. The hard steel tubing between the exhaust & the check valve can rust or crack (especially the infamous "crossover tube" on the backs of V8 heads). The vacuum controls leak (including the coffee can reservoir on the R wheelwell) (Miesk5 NOTE, this is the Vacuum Reservoir (VRESER), it stores excess vacuum to prevent rapid fluctuations and sudden drops in a vacuum signal, such as during acceleration) get misrouted during other repairs, or the diaphragms rupture. The electronics that control the vacuum controls can fail electrically or mechanically, or the wires can be damaged. But all of these failures are either A) relatively cheap & easy to repair, or B) cheap & easy to prevent with normal inspection & maintenance..."
by Steve83 (Steve, That dirty old truck) at SuperMotors.net

by Steve83
 

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yo,
I see that you bought another PSOM or cluster w/PSOM.. hope it solves the problem... btw never store the cluster in any position except for gauges facing Up.
Leaving the cluster face down may result in a loss of dampening; The lost fluid could stain the cluster face or result in excessive pointer waver..."

Gauge Removal info & pics in 80-96; "...The PSOM, lens, blackout ring, terminal clips, shifter plates, bulbs & holders are interchangeable between cases. 87-96 gauges are only held in by their terminal clips, except the speedo. 80-91 speedos are held in by 2 screws; 92-97 PSOMs are held captive by the surrounding gauge faces. 80-86 use the same case for tach & non-tach, with a blank face for non-tach. 80-86 gauges are held in by stamped nuts on threaded studs. The fuel, oil, & temperature gauge bodies are identical & interchangeable by prying the needle off & removing the 2 screws holding the body to the face plate. To reinstall the needle, the gauge must be powered & have a known signal applied (usually the minimum) before stabbing the needle so it points to the proper reading. The screws are 5.5mm (7/32") hex with T15. Note that both cases have a molded socket for an anti-slosh module (low fuel light, which was never installed at the factory) and both film circuits have 4 traces for the socket..."
Source: by Steve83 (Steve, That dirty old truck) at http://www.supermotors.net/registry/media/774679
 

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based on this discussion i assume it would be a problem if two of those colored lines were severed. behind the plenum along the firewall there is a rubber intersection where all the lines are organized together... after that the yellow and green(?) are severed.
 

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Ok this might sound dumb but I had a door switch go bad on my 94 /5.8 I removed the fuse so that the dome light would go out that fuse also runs the speedo and tells the trans what to do. I found this while tracing down wiring diagram. It may sound like Im crazy but without the fuse the trans did shift but it wasn't pretty and its some thing easy to look at .
 

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Ok this might sound dumb but I had a door switch go bad on my 94 /5.8 I removed the fuse so that the dome light would go out that fuse also runs the speedo and tells the trans what to do. I found this while tracing down wiring diagram. It may sound like Im crazy but without the fuse the trans did shift but it wasn't pretty and its some thing easy to look at .

Yo, Exactly; & Ford addresses this in:
TSB 94-09-12 Visor Screws
TSB 95-14-11 Dome Lamp Screws
Publication Date: JULY 17, 1995
LIGHT TRUCK: 1994-95 BRONCO, F SUPER DUTY, F-150-350 SERIES
ISSUE: Some customers may have concerns that the following features are inoperative:
* All courtesy lamps
* Map lamps
* Engine compartment lamp
* Glove compartment lamp
* Odometer in the instrument cluster
* Dome lamp
* Power mirrors
* Lighted vanity
* Cargo lamp
* Remote keyless entry
This is due to insufficient clearance between the outer roof panel of the cab and a map/dome lamp mounting screw, causing a short in Circuit 54, which causes Fuse 8 (15 amp) to become inoperative. This fuse protects the wiring for the above vehicle features.
ACTION: Replace existing dome mounting screws with new, shorter screws. Refer to the following procedure for service details.
BACKGROUND
Three (3) screws (52814-S36) are required to mount the map/dome lamp to the inner roof panel of the cab. Two (2) of the three (3) screws are used to complete two (2) electrical circuits, 53 and 54. Circuit 53 is after the lamp switches and is "cold" ("cold" means that 12 volts are not present) and Circuit 54 is before the lamp switches and is "hot" at all times ("hot" means that there are always 12 volts present).
The 52814-S36 screw is approximately 25.4mm (1") long. When there is a sufficient amount of downward force applied to the outer roof panel of the cab, the panel will make contact with the screw that has Circuit 54 (12 volts) on it. For example: When the brushes and dryer pass over the roof of the truck in a car wash or when traveling at highway speeds. As the roof panel contacts the screw, it causes a direct short-to-ground. When this occurs, Fuse 8 will be overloaded (15 amp), open and disable the listed features.
SERVICE PROCEDURE
1. Carefully pry pillar/dome lamp lens from interior lamp body.
2. Remove screws retaining interior lamp (map/dome) to roof trim panel.
3. Install new screws (52802-S36, 19mm).
NOTE: ANOTHER OPTION WOULD BE TO REMOVE OLD SCREWS AND CUT/GRIND APPROXIMATELY 6.35mm (1/4") OFF THE END AND REINSTALL.
4. Reinstall pillar/dome lamp lens.
PART NUMBER PART NAME
52802-S36B Screw (19mm)
OTHER APPLICABLE ARTICLES:
95-2-11
WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
951411A Replace Dome Lamp Mounting Screws 0.3 Hr.
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TSB 94-09-12 Visor Screws
Publication Date: MAY 4, 1994
LIGHT TRUCK: 1994 BRONCO, F-150, F-250, F-350
ISSUE: The Instrument Panel Electrical PSOM (Programmable Speedometer/Odometer Module) may be inoperative or not function properly and the #8 fuse may be blown. In addition, if the vehicle is equipped with an E4OD transmission, it may exhibit a harsh shift. These conditions may be caused by trim screws installed through the 17K745 visor wire between the left hand "A" pillar and the left hand visor bullet connector.
ACTION: Tape the damaged or exposed wire conductor and add scrolling to protect the wiring from trim screw shorts. Refer to the following service procedures for service details.
SERVICE PROCEDURE
1. Remove the garnish moulding. Refer to the 1994 Econoline, F-150-350, Bronco F-Super Duty Service Manual, Page 01-05A-5, for the removal procedure.
a. Inspect the wiring condition against the trim screws.
b.Check screws for burn marks.
2. If burn mark is found, use electrical tape to protect exposed/damaged wire. Add 1/4" (6.35 mm) scrolling to maximize protection.
3. Replace #8 fuse.
4. Reset the PSOM to see if it is functioning properly. Refer to the 1994 Econoline, F-150-350, Bronco F-Super Duty Service Manual, Page 13-01A-8, for the reset procedure.
5. Reinstall trim. Refer to the 1994 Econoline, F-150-350, Bronco F-Super Duty Service Manual, Page 01-05A-5, for the installation procedure.
6. Recheck fuse #8 and PSOM final verification.

PART NUMBER PART NAME
D4FZ-14A099-B 1/4" Scrolling (25 Ft. Roll)
D6AZ-19627-A Electrical Tape
D9ZZ-14526-D Fuse
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of The Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME
940912A Check And Repair Wiring 0.6 Hr.

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Also; other issues that affect the PSOM are
TSB 95-5-21 Fuse "E" Inoperative - ABS Light On - Back-Up Lamps Inoperative - DRLs Inoperative - MIL On - Speedometer Inoperative
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. Inspect Fuse "E" and replace if necessary (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
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PSOM & Odometer Not Working & E4OD Harsh Shift TSB 94-09-12 for 94 Bronco & F Series; "...PSOM (Programmable Speedometer/Odometer Module) may be inoperative or not function properly and the #8 fuse may be blown. In addition, if the vehicle is equipped with an E4OD transmission, it may exhibit a harsh shift. These conditions may be caused by trim screws installed through the 17K745 visor wire between the left hand "A" pillar and the left hand visor bullet connector..."
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all above by Ford via Steve83
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PSOM Pointer Waiver TSB 96-21-11 for 92-96; "..The speedometer needle may waver and or a light surge may occur on some vehicles...This may be due to slight dents/chips in either the exciter ring or the Vehicle Speed Sensor (VSS) and air gaps between the VSS and the exciter ring. Any slight dents, chips, etc., in either the exciter ring or VSS will create needle waver. Measure air gap between the VSS and exciter ring. It should be 0.38-0.51mm (0.015-0.020"). Check exciter ring runout per the same ring gear backface runout procedure of the appropriate model 1996 Powertrain/Drivetrain Service Manual, Section 05-00. Make sure the exciter ring is mounted correctly to the ring gear. If runout is more than 0.1mm (0.004"), perform the differential runout check per the procedure in the appropriate model 1996 Powertrain/Drivetrain Service Manual, Section 05-02A or 05-02D, to find cause and repair as needed. If all items listed above check good, replace the Instrument Cluster Assembly. Obtain the correct service part number from the Parts Catalogue and then contact the Electronic Odometer Exchange Center at (800) 259-9700 for U.S. Dealers and (800) 663-9974 for Canadian Dealers..." read more Source: by Ford via miesk5 at cc
 
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