Im working on a 1995 Motorhome that's on a F350 chassis. The original problem was the speedometer and odometer were not working at all. Put a new cluster in and now the odometer works but the speedometer will only hit about 5mph. Replaced the speed sensor and I am still having the same problem. No matter how fast I go the speedo won't go over 5-7 MPH. Anybody else ever hove this problem or know what the issue could be? Thanks!

 

Does the odometer count up at the right rate? For example, if you were to get up to, say, 30 MPH, would it count up 1/10 mile every 12 seconds?

 

What was the cluster out of?
What is the CAL set to?

I would go and put the old speedometer head into the new cluster with the new PSOM.

 

I haven't watched the odometer honestly. Once I saw it worked I've just been focused on watching the speedo needle.
The new cluster is out of a '95 f250. The frame of it won't work in the motorhome dash so I only used the speedo board in the old cluster.

 

By the way you have an E350 and not a F350.
The frame of the cluster is the same so I do not understand what you mean by won't work in the Motorhome dash because of the frame.
The speedometer goes to 90 in the E-series and 85 in the F-series.(E-series numbers to 85 and F-series to 80)
The E series has an anti-slosh module in the cluster and the F-series does not.
Just to make sure this is a class "C" RV is it not?

 

It's a class A motor home. That's why it won't work in the dash. The way the clear plastic it configured it's different then it is in a e350 or f350. But all the pieces inside like the tachometer, speedo, fuel, oil pressure battery fit into both frames which is why I only used the speedo part cause that's all I needed. The frame/chassis itself is not an actual e350 chassis. Just all the components as far as sensors, gauges, wiring etc.

 

If it is a Ford with a 460 engine you have an F53 and not a e350 or f350.

1. I used a 1992 F150 cluster in my 1995 F53 class "A" Motorhome so I know a cluster is the same and will fit.

2. You say you replaced the speed sensor. The speed sensor in a 1995 F53 is located in the parking brake housing behind the E4OD transmission.

3. You say you replaced the "speedo part" from a 1995 F250 cluster. If you did not reprogram the PSOM (speedo part) it is normal for it to do what yours is doing.
You have to reprogram the PSOM to a Conversion Constant of 1.0 then it will work.
Also the speed sensor must have the same gear on it that your old speed sensor (VSS) had on the end.
Note it has also been know for the VSS drive gear on the brake shaft to melt and need replacing.

The F53 cluster:


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How do I reprogram it?
And yes I know the speed sensor is on the back of the transmission.

 

And yes I'm sure I have a ford. The gauge cluster looks just like yours except the tach is on the right and it has fuel, battery, oil pressure and water temp on the left side.

 

That photo was of my 1995 F53 before I put the 1992 F-150 cluster in with a tachometer.

I have found it a little hard to set another PSOM to CAL 1.0 that I have taken from a F-series 92-97 truck the normal way.

But the way the book says to do it is:
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Reprogram speed conversion constant using the following procedure:

-- Locate the dealer mode programming enable single-terminal connector. The connector is located at the bottom of the instrument panel below the center of the glove box. On all vehicles, the dealer mode enable wire is Circuit #567 (LB/Y).

-- Insert metal clip in service wire panel connector. Clip other end to vehicle ground while the key is in the OFF position.

-- Turn key to RUN (not crank) position while holding down the trip odometer RESET button on speedometer. Release RESET button.

-- Speedometer will prove out (sweep across dial and back). The English/Metric and revision levels will be displayed. The last number of the display is the dealer mode programming lockout count. This count shows the number of allowable conversion constant changes remaining. When the count is zero (0), no additional changes can be made to this instrument cluster. If a conversion constant change is required, a service instrument cluster must be ordered. Refer to this section for ordering information.

-- Press and release RESET button again and PSOM conversion constant (without the decimal point) followed by the word CAL.

-- Press and release the odometer SELECT button as many times as necessary to change conversion constant to the correct value.

NOTE:
Pressing and releasing the RESET button to lock in the new Conversion Constant reduces the number of times the PSOM can be reprogrammed by one count. The module can only be reprogrammed six times. If you change your mind and want to go back to the old conversion constant, turn the ignition switch off before you lock in the new constant.

-- When the correct new value is displayed in odometer window, press and release the RESET button to lock in the new conversion constant.

-- Turn the key off and remove the ground wire. Verify proper speedometer operation.

 

I'll give that a try.
Thank you!

 

Is this the same procedure I would use to change the mileage too?

 

The old EEPROM needs to be removed and soldered into the new PSOM board.
Some have also soldered a socket in the new PSOM board to insert the old EEPROM in the new PSOM board to keep the mileage and CAL.

 

Enable PSOM programming & test connector:


PSOM Wiring:

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The problem I'm having is the CAL only goes down to 500 then jumps back up to 1100