Why my temp signal wire goes into tach ? - Defender Source
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  #1  
Old February 22nd, 2011, 10:28 PM
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Julien Dalbin
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Question Why my temp signal wire goes into tach ?

This is the kind of thing that makes you curse
(again) about british auto electrical systems.

Long story short: i swapped my temp gauge and
sender with the VDO units and since that my temp
is not climbing over... 110/120 F. Outside temp
is around 28 C (sorry northern fellas ) A/C on,
traffic jam, etc... so i finally decided to start the
electrical CSI.
The gauge is working fine, if you plug to ground or negative
the sender connector on the back of the gauge, the needle
will travel all the way. If you by-pass the sender and
make a direct ground between engine (or chassis) and
the connector on the sender, needle will travel about
half the way.
So i started checking the wire and found out that it
goes in and out the tachometer, and this is where
i loose the connection (partially).
So, before i go any deeper, anyone know why in the name
of the rover gods, my temp signal wire has to make a stop
in the tachometer ?
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  #2  
Old February 24th, 2011, 03:08 PM
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Paul McConnell
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The TD5 temperature sender's wiring goes through the instrument pod, where it is 'conditioned' to suit the factory fitted temperature gauge. Consensus is that this 'conditioning' is simply a resistor.


If you have a spare moment (it currently stands at 426 posts long ), have a read of this -

http://forums.lr4x4.com/index.php?showtopic=14892


As you're replacing your temperature gauge and sender for matched VDO items, you shouldn't need to wire it through the instrument pod, just wire it in the traditional way, where the wire from the temperature gauge goes directly to the temperature sender.

.
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  #3  
Old February 24th, 2011, 09:28 PM
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Julien Dalbin
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I just did that, changed the wire routing and by-passed the tachometer and i'm finally getting a coherent reading (200 F).
So if you have a factory Td5 or Tdi wiring harness and you're going VDO, take that precaution. The funny thing is that detail doesn't show up on the wiring diagram, at least on the Tdi diagram.
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  #4  
Old February 25th, 2011, 05:47 AM
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Paul McConnell
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Quote:
Originally Posted by JFD View Post
I just did that, changed the wire routing and by-passed the tachometer and i'm finally getting a coherent reading (200 F).
So if you have a factory Td5 or Tdi wiring harness and you're going VDO, take that precaution. The funny thing is that detail doesn't show up on the wiring diagram, at least on the Tdi diagram.

Up to 300Tdi vehicles, the wiring is direct from the sensor to the gauge.

It's only on TD5 vehicles with the electronic instrument pod, that this new wiring 'feature' is found.

Just to confuse, there is also a TD5 specification vehicle with a 300Tdi engine - this is called the RoW Spec. (Rest of the World Specification), which was made for markets that the TD5 engine was considered unsuitable for.

A wiring diagram for the 2002 TD5 (and RoW 300Tdi) can be found here -

http://exerro.com/oldsites/2009/indi...com/landrover/


or directly to the .pdf, here -

http://exerro.com/oldsites/2009/indi...%20Diagram.pdf


Paul.
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  #5  
Old February 25th, 2011, 06:38 AM
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Julien Dalbin
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Quote:
Originally Posted by PaulMc
Just to confuse, there is also a TD5 specification vehicle with a 300Tdi engine - this is called the RoW Spec. (Rest of the World Specification), which was made for markets that the TD5 engine was considered unsuitable for.
Paul.
My case precisely.
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