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Speedo not working; TDaily 2.8 W2000 plate 1998 body speedo fault
Topic Started: Mar 26 2012, 12:21 PM (51,750 Views)
Bazil-S
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Hi,

As you see, I do not have a wiring diagram of the speedometer, just for the tachograph, which is different.
Normally, through fuse box do not pass the signal wires, but anything is possible, try to replace the CUI with the old one for test.
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stroppygit
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Hi Bazil-S, I've found a black box!
It was situated behind the fuse box, screwed to the wheel arch. it is iveco part number 98418150. It has leads with some of the same numbers as the speedo ones.

It is also full of water.

Clearly the water is an optional extra.

What is this gizmo? VEXI list it as 'Iveco adaptor' very helpful description!

I have a suspicion that my speedo may work when I've cleaned and dried this thing.

I cannot try the old CIU as it did not survive my attempts to fix it!
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Bazil-S
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Iveco catalog ( speedometer section) says the same: adapter, it is probably a pulse adapter. Inside the box must be a dip-switch for pulse adjustment. Do not disturb him.
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stroppygit
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Yep, it has the dip switch, left as is by me. I'll let you know the outcome of the washing and drying! Thank you for your involvement too.
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Bazil-S
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It was my pleasure, I keep my fingers crossed.
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stroppygit
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Ok, I cleaned and dried that adaptor and reconnected everything.
Still no speedo.

However, I set my multimeter to frequency and tested some more.
Interestingly with one probe on pin 5 of A (0000 and 5508 pair of brown leads) and the other probe on the one and only lead for connector B (5513) I got a reading of 25hz in third gear at just short of 1000 rpm. the reading rose proportionate to revs and goes to zero when you depress the clutch (stationary propshaft).

Does this mean that my speedo is broken or is it not that simple?
Edited by stroppygit, Mar 29 2012, 04:39 PM.
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hannibal
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My speedo went off a few weeks ago. Mine had lost the earth pin 5 connector A. This earth connects to the brown wire on the back of your speedo. I unscrewed the brown wire from the back of the speedos curcuit board and connected it to earth with a length of wire worked a treat....might be the same fault......PS the black box you have found sounds like the thermostarter control box to me. Some wires do have the same codes All perminent live wires are 7772 and all earths are 0000 unless stated so it is not uncommon to find wires with the same codes in a few places on the truck, well on my truck anyway..
Edited by hannibal, Mar 29 2012, 05:54 PM.
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Bazil-S
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Hi,

The impulses for the speedometer have positive phase, is measured with one probe to the signal wire and the other probe to earth.
The wire with the code 5513 is the speedometer output signal used to optional devices such as air suspension, electric door, speed limiter for 4x4 engaged, etc ...
These devices use this signal to limit the speed, or to modify the device operation, eg the air suspension system is switching to automatically mode from manual mode, after exceeding 15 km / h.
This wire is not used in your van, but it has signal, thats means: the sensor is good, the wires are whole, the adapter works, speedometer receives and emits signals, but does not show the speed..... so, pobably is faulty.
Please send me the codes on the wires from the A connector from the speedometer.
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stroppygit
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i'm pretty sure the thermostarter control box is the one to the right of the fuse box it is screwed to the right hand wall above the wheel arch, I wrongly described my black box as being on the wheel arch, it is on the bulkhead directly behind (forward of) the fuse box.

I'm a bit alarmed to see that whoever fitted the receiver for the remote for my door has put the screw through the top of the area where the CIU is into a bunch of wires. Without taking the dashboard out I cannot tell if it has done any damage, I have removed and refitted it about one or two dozen times (not knowing it was stabbing things). Oh dear.
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stroppygit
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Hi Bazil-S
they are
1 red 7772
2 Grey 4444
3 Green 8879 (if you read this earlier I mis read this one as 5879, my apologies)
5 Brown 0065 and 0066
6 Brown 0000

I thought the presence of variable frequencies at 5513 should mean all is well except for the speedo itself. Thanks for thinking likewise!

As my van (her name is Jynx, appropriately) has the electric door so perhaps that's why the wire 5513 is present.






+ + + This does not show that the speedo is receiving anything as the wires were not connected to the speedo when these tests were done.

+ + + Some additional info.
the one and only wire to connector B on the speedo (5513) is connected to 0058 on yet another connector in the dash. That connector has the following wires passing thru it (I think they go to the 'Iveco Adaptor' mentioned earlier.
in no particular order:-
5514
5511
0055 (could be 0066 hard to read)
5517
0058
Edited by stroppygit, Mar 30 2012, 03:42 PM.
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stroppygit
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Some more info on the speedo.

with the yellow (A plug) disconnected:

Pin one is showing a variable frequency output which is proportional to engine RPM, being in gear or not has no effect on this signal.
Pins 2 and 3 show no frequency output.

I double checked and the wire 5513 (which connects to pin 3) is definitely showing variable frequency proportional to road speed (rear wheels off the ground spinning for those that might think that I'm driving around at the same time as peering at a multimeter! ;)
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Bazil-S
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Hi,

On the yellow connector should be (the connector on the speedometer, not the wiring):
1 - positive for sensor
2 - Sensor earth.
3 - signal from the sensor
Measure the voltage between pin 1 and pin 2 of the speedometer, with the ignition on.
Between the sensor and speedometer the adapter is inserted, which is designed to supply the voltage to the sensor and adjust the impulses. Your sensor operates at 8V and the speedometer supplies 12V on pin 1 and 2 of the yellow connector B (your picture).
In a connection without adapter, from yellow connector (speedo), goes directly a cable with three wires to the sensor: 1 - positive, 2 - earth, 3 signal. But you need a sensor operating at 12V (new type),
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hannibal
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Did you try earthing the brown wires on the back of your speedo. Unscrew the cross head screw from the board and connect them to earth......you have got all the symptoms i had with mine
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stroppygit
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Thank you Hanibal and Bazil-S. Just back from a starlit walk with Gerty my dog. I'll do some more investigating tomorrow.
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stroppygit
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Hi folks.

Connector B.

Plug removed.
Engine running.
Pins 1 & 2 (which go nowhere on the plug) 12.5 volts.
Pin 3 nowt.

The wire (5513) which connects to pin 3 - variable frequency proportional to road speed.

I tried your earth suggestion hannibal, made no difference. I have continuity to earth at the battery tiny brown lead in any case.

I think it's reasonable now to assume my tachometer is knackered? I've completely dismantled examined and reassembled it. Cleaned up the contacts between the 7 wires that screw to it on the back and even refitted them to where they belong.

As a spin off to this investigation my headlamp adjusters now work properly. I found the kerbside one needed it's cable socket tightened as it was a poor fit to the servo and the actuating switch in the dash needed it's wiper and pcb cleaned. Wasn't even on my list.

The clumsily fitted radio receiver for the electric door I mentioned. The person who fitted this put the self tapping screw through two quite thick leads. One + and one -ve. LUCKILY it didn't short, my beloved van could have been toast.

Any thoughts on my assumption that speedo is dead? Where to get a replacement without being ĢIVECO poorer?
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