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Speedo not working; TDaily 2.8 W2000 plate 1998 body speedo fault
Topic Started: Mar 26 2012, 12:21 PM (51,748 Views)
mark hadley
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I know and understand the DIP switches. I have the tables, I have used them and experimented with them. But the maximum that the DIP switches will do is still 13% too low.
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Bazil-S
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The only adjustment which can be done it's from DIP switches.
It is possible that those tables do not include the resulting values after the calculation with that tire size. That tire size is a little unusual, you probably own a 4X4.
What is odd, is the speed difference between tires: 255/80/16 and 255/100/16 is exactly -13%, it is probably a coincidence.

P.S.
There are two gear ratios on 4x4 vehicles: 1/5.222 and 1/6.14
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mark hadley
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Bazil-S
Feb 3 2013, 11:45 AM
The only adjustment which can be done it's from DIP switches.
It is possible that those tables do not include the resulting values after the calculation with that tire size. That tire size is a little unusual, you probably own a 4X4.
What is odd, is the speed difference between tires: 255/80/16 and 255/100/16 is exactly -13%, it is probably a coincidence.

P.S.
There are two gear ratios on 4x4 vehicles: 1/5.222 and 1/6.14
It is strange.It is indeed 4WD both: axles must be the same ratio (I thought there was only one choice 1/6.14). There was mention of a divide by 4 in the box (is that amplitude or frequency?). Do you know why there would be 4 prongs on the gearbox sender - I think there is only wiring for 3. Do you know if there is a choice of gearbox sender?
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yacouz
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Hi everyone,

Forgiving for responding to an old post, but I just read it and I am sure that some of the members would be able to help me. Also you will soon realise that I am not an expert, quite the opposite actually, so please bear with me and my very limited technical knowledge!

I have a left hand drive (I say this in case it's relevant to my question!) 1991 coachbuit camper based on a 2.5 td daily. The speedo has recently developped a fault, it basically works for a couple of seconds every few miles or so. So I bought a second hand speedo which must have come from a right hand drive as it reads in miles. I was very happy to find out that the speedo worked, but I quickly realised this wouldn't be the end of the story. The numbers it reads are basically in kilometers for distance and km/h for speed. For example if I am actually doing 25 mph it reads 40.

So I called the scrapyard where I bought the speedo from and he said I needed to change the so-called "controller box" which I bought from him. Now all I need to do is fit it...probably (and hopefully) easy for any of you guys but not for me!

I would be very grateful if anyone could give me step by step instructions on how to change it?

I have attached a photo of the part, its number is 98418150.

Thank you in advance!
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Attachments: control_box.jpg (67.22 KB)
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Bazil-S
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Hi,

This is the speed signal adapter is located in the fuse compartment in the top 4x2 vehicles, or behind the fuse box 4x4 vehicles.
Remove the connector, then undo the two screws.
But I fear that this is not solving your problem, you will need to go to an workshop for tachographs calibration.

Posted Image

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yacouz
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Hi,

Thank you for the advice Bazil-S, I opened the fusebox today but it doesn't look very similar to the diagram you posted. There is a box behind the fusebox but it doesn't look like it's the same as mine. I also try to look underneath the floor carpet on the wheel arch, again no sign of control box.

I am attaching photos of the fusebox and the box behind it.

I have another question, I was advised by a garage that replacing my speedo by a tachograph would allow to match the mileage to the correct current mileage, and that it would be easier to calibrate it. Is that correct?

Finally, does anyone think that my original speedo could be repaired? Does the fact that it was working intermittently suggest a bad connection?


Any help would be very welcome, thank you in advance!
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Attachments: fusebox1.jpg (143.37 KB)
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Bazil-S
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Hi,

That box is from car alarm.
Being different configurations of Daily the adapter can be located above or on the side, but in the fuse box area.
The speedometer is the same for all versions of Daily (second generation), but they are different models of vehicle, ie, different gear ratios, different wheel sizes, etc. ... so you need a speed signal adapter . This adapter has inside a series of micro switches which can be set in a certain order to adjust the speed signal in accordance with the characteristics of your vehicle.
A Taho technician knows where the adapter is located and have precise tools to measure a speed coeficent necessary to set the adapter.
To set by yourself that adapter.... you need to know the gear ratio of the rear axle, the length of wheel circumference, then you need a spreadsheet specifically for the Daily speedometer. I posted some tables, some time ago, you will have to search the forum.

Yes can be an imperfect contact, but it can be inside the speedometer, or can be on the wiring.
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yacouz
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Hi,

Thank you, it's starting to make sense! It's weird, really can't seem to find the adapter on mine. I am willing to give this as go as I have got the part now. I admit that I would have to be extremely lucky if its configuration was spot on for my vehicle, but I am hoping that the reading might be close enough for now...Would you have any other suggestions on where it could be? It's not the part situated near the gearbox underneath the vehicle, is it?

In the meantime I will try to open my original speedo to see if I can spot an obvious bad connection.

Again thank you for the support, much appreciated!
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Bazil-S
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There must be somewhere in the cabin. It may be behind the speedometer. Take a picture with the connectors from speedometer, please.
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yacouz
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Hi again,

This is depressing, I simply can't find this control box :'(

I opened the speedometer and the revcounter, no sign of it behind it. I also had a look under the bonet and tried to follow the cable from the speedo but again no adapter anywhere. Oh and I also had a look underneath the camper but nothing obvious, although I couldn't see very clearly...I am not an expert but it certainly isn't in any obvious place. Would you have any other idea? Could it look completely differently? Finally, do you think I should just take it to a workshop and they will find it?

Any suggestion welcome, thank you in advance.

PS: some photos attached in case you or anyone can spot anything!
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Attachments: 5.jpg (112.49 KB)
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Attachments: 1.jpg (134.42 KB)
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Bazil-S
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Hi,

I am asked to take a picture with the connectors of the speedometer in my last post. It looks like you made not. The reason was to see the configuration of connectors wires, according to this I can recognize if the speedometer has signal adapter or not.

You can read the codes printed on the wires and tell me their order in the two connectors.
These are the possibilities:
White connector:
pin 1 = 7772
pin 2 = 4444
pin 3 = 8879
pin 4 = not used
pin 5 = 0066, or 3366
pin 6 = 0000
pin 7 = not used
pin 8 = not used

Yellow connector:
pin 1=5514
pin 2=5558
pin 3=5517/5513
pin 4=5516
pin 5, 6, 7, 8= not used
speedo without adapter

or Yellow connector:
only one wire on pin 3= 5513
speedo with adapter
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yacouz
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Hi,

Sorry I had misunderstood your request for a photo of my old speedo, thought you wanted to see the wires behind the dashboard.

Unfortunately I cannot read any number on the wires of my speedo, but I have attached a photo just in case you can recognize the model.

I was thinking about it last night, would it be possible that only the right hand drives need the pulse adapter to adapt it from kilometer to miles? Or is the adapter to adjust for the type of vehicle the speedo it fitted on?

Anyway, here is an update of my current situation: I have spoken with my mechanic and he will fit in a tachograph which he can calibrate for an accurate speed. And he said he can adjust the mileage to the my real mileage and seal it so that it cannot be changed after. Does this sound like a right way to go with this? Any advice welcome, thank you very much!
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Bazil-S
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You misunderstood again, I asked for a picture of the connectors on the speedometer to see the wires, but never mind... was not really necessary.
The tachograph is a solution, the model 1318 should have the same shape, the only thing you need is a plastic diagram as tachograph do not operate into the void (dummy diagram).
It is possible that the adapter be only on 4X4 vehicles and / or RHD, but I doubt it, because through that adapter, the speedometer is configured after vehicle characteristics.
Keep me posted.

P.S.

If the the yellow connector, has a single wire, then the adapter must be somewhere...
Edited by Bazil-S, Apr 29 2013, 08:52 PM.
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my fishtank
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^^ When I had a quite nasty electrical fire my control box got rather burnt & melted but I'd read somewhere that they were only necessary on 4x4s, for what reason I can't remember, so when I replaced a large chunk of wiring I didn't replace the box, it made no difference to the reading on my speedo. Sometime previously I'd replaced a broken tacho with a second hand speedo which always over read, but I thought the only way to cure that problem was by changing the sender on the gearbox which I never quite got around to doing.
Edited by my fishtank, May 5 2013, 02:52 AM.
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tiktok
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Apr 1 2012, 11:31 AM
Hi,

I stopped working on Daily second generation for some years, so my previous information may be inaccurate, but the system basically works like this: there are three devices: sensor, adapter, and speedometer / odometer, or tahograph.

The sensor has four pins: 1 and 2 are for supply and 3 and 4 for signal. Signal is rectangular and has a positive phase (pin 3), and a negative phase (pin 4). The speedometer use only positive phase, which is transmitted on pin 3 corresponding to the wire 5517. Negative-phase signal is transmitted on pin 4 corresponding to the wire 5516 and is only used on tachographs.

The adapter is designed to ensure the voltage for sensor, and adjust and amplify the signal. Previous sensor model operate at a voltage between 6V and 15V max (and signal between -2V, max 13V) , so the adapter will provide a constant voltage of 8V for sensor. New sensor model is operating at a voltage between 6V and 36V, so it does not need a voltage regulator and can be powered directly from the vehicle electrical system (in our case, direct from speedometer).
Also the adapter will split the speed signal to the auxiliary devices.
Here to the adapter occurs the confusion because the signal wire 5517 turns into 5513, the positive wire sensor is 5514, not 7772 or 8879, also appears the wire 5511 which is also positive for the sensor. Earth for sensor is 0058 not 0000, or 0066. Also, in adapter has entered water, which probably made a short circuit between wires and is likely to be sent 12V, or more to the signal wire coming from the sensor. This can damage the sensor.

The speedometer has two connectors, connector A white colour that is used to supply the speedometer. The pins configuration are: 1 - Positive from battery (via fuse) for clock, red with the code 7772. 2 - Positive for instruments light, grey with the code 4444. 3 - Positive from ignition, green with the code 8879. 4 - free. 5 - earthing isolated directly from the battery terminal, used for clock, brown with code 0066 (in some models of Daily this wire is yellow and has the code 3336). 6 - earthing for the speedometer, brown with code 0000.
Yellow - B connector used for sensor: pin 1 - positive for sensor orange - 5514 code , pin 2 - Sensor earth, brown - 0058 code, pin 3 - positive phase signal from the sensor, orange 5517 (5513) code.
In your case, pin no 1 and 2 are not used, because the sensor supply comes from the adapter.

What can you do: check the voltage supply to sensor, on the wires 5514 and 0058, both to the adapter connector and connector from the sensor. Disconnect wire 5517 from the adapter and connects it with 5513 wire, and see what happens (the signal from the sensor will be directly in the speedometer). Check the internal resistance of the sensor between the supply pins must be 1.5K ohms.
Measuring the frequency is inaccurate, because the multimeter measures usually a sine wave, with both phases, and has a very high sensitivity and can measure spurious signals, such as engine speed.
All three components, sensor, speedometer and adapter, contain electronic parts which can be damaged to a short circuit caused by water, so it is hard to find a flaw.




Hi,

I am just starting to trouble shoot a similar problem and this thread has been invaluable so far.

My tachograph speedometer has stopped working, although the illumination light works, the speedo and clock do not. I have had it removed and tested and it works as normal on the test bench.
I don't use the tacho as this is a private vehicle.

My white A connector:
1 Red - 7772 - has 12v feed
2 Grey x2 - 4444 - 12v feed with lights on
3 Green - 8879 - 12v feed with ignition on
5 Yellow - 3336 - no earth, no power - (should this be earthed ?)
6 Brown - 0000 - Has earth connection

My yellow B connector
1 Blue - 5514
2 Brown - 0058 (or 5558 not sure )
3 Black - 5517
4 White - 5516
7 Orange - 5513

A connector - If I connect the brown and yellow, when ignition is off, with a piece of wire then the clock starts working, the 30km red light illuminates when the tacho switch is turned and the speedo does a very very small wobble then rests..

Perhaps this is the problem ? I have yet to take the vehicle for a drive with the yellow and brown wires connected. I see from the downloadable pdf linked to in earlier posts that the yellow is an insulated earth and the brown an earth. Any idea where this insulated earth goes, so I can check the other end ?

If this doesn't work I will carry out the tests recommended in the quoted text on the B connector, but am not sure where the sensor is situated - is this on the gearbox somewhere ? I assume the adaptor is the box behind the fusebox, attatched to the wheelarch with two connectors similar to the connectors A and B in the back of the taco ?

Kind Regards


Edited by tiktok, May 29 2013, 10:04 AM.
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