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Old 01-09-2006, 03:01   #1 (permalink)
Jacqui
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Re: 1995 Discovery 2.5TDi - ECU codes


Marc Draper wrote:
> In message <1135209717.720591.171610@g14g2000cwa.googlegroups.com>,
> Jacqui <jasnook@ntlworld.com> writes
> >Marc,
> >
> >I thought I would go with your option but I cannot find the ECU. Tried
> >under the dash behind the glovebox, under the passenger seat and to the
> >right of the steering wheel but no luck. I have found an EGR ECU by
> >the steering wheel. Any idea where else I should look?
> >
> >Tim
> >

>
> Are we talking a UK car?
>
> If so then it is located behind glovebox. It is the biggest "box" behind
> there and has WABCO written on it. It has a very large ECU plug that
> faces you and is easy to unplug.
>
> Good luck
>
> --
> Marc Draper


Marc,

I have found the ECU, thank you. I have also been in touch with Wabco
and they have given me the blink codes to get more diagnostic help. Do
you know where the diagnostic plug is - I think it is supposed to be
blue in colour to strap pin 14 to ground to get the ABS light to reveal
the error codes? I see from the Wabco document that it has an ISO 9141
interface and pin 13 is the K - line. This all smacks of OBD
compliancy so should I be looking for a J1962 connector rather than a
5-way blue socket?

Tim

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Old 01-09-2006, 11:01   #2 (permalink)
Marc Draper
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Re: 1995 Discovery 2.5TDi - ECU codes

>
>Marc,
>
>I have found the ECU, thank you. I have also been in touch with Wabco
>and they have given me the blink codes to get more diagnostic help. Do
>you know where the diagnostic plug is - I think it is supposed to be
>blue in colour to strap pin 14 to ground to get the ABS light to reveal
>the error codes? I see from the Wabco document that it has an ISO 9141
>interface and pin 13 is the K - line. This all smacks of OBD
>compliancy so should I be looking for a J1962 connector rather than a
>5-way blue socket?
>
>Tim
>


On a RHD it will be tucked up around the area of the fusebox. Can be
tricky to find.



--
Marc Draper
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Old 01-09-2006, 16:01   #3 (permalink)
Pete S
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Re: 1995 Discovery 2.5TDi - ECU codes


"Marc Draper" <marc@mdeng.demon.co.uk> wrote in message
news:rIJjwECISkwDFwzK@mdeng.demon.co.uk...
> >
>>Marc,
>>
>>I have found the ECU, thank you. I have also been in touch with Wabco
>>and they have given me the blink codes to get more diagnostic help. Do
>>you know where the diagnostic plug is - I think it is supposed to be
>>blue in colour to strap pin 14 to ground to get the ABS light to reveal
>>the error codes? I see from the Wabco document that it has an ISO 9141
>>interface and pin 13 is the K - line. This all smacks of OBD
>>compliancy so should I be looking for a J1962 connector rather than a
>>5-way blue socket?
>>
>>Tim
>>

>
> On a RHD it will be tucked up around the area of the fusebox. Can be
> tricky to find.
>
>
>
> --
> Marc Draper


Look under the stearing wheel below the fuse box cover. There is a socket
that looks just like an ODB connector.
My 96 300 TDi has Electronic Diesel Control and this connector is where
testbook is plugged in.

Peter


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Old 01-10-2006, 02:01   #4 (permalink)
Marc Draper
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Re: 1995 Discovery 2.5TDi - ECU codes

>Look under the stearing wheel below the fuse box cover. There is a socket
>that looks just like an ODB connector.
>My 96 300 TDi has Electronic Diesel Control and this connector is where
>testbook is plugged in.



He already knows where the OBD socket is.

But that said it he has and OBD socket there is no real need for the
blue ABS diagnostics plug
--
Marc Draper
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Old 01-14-2006, 12:01   #5 (permalink)
Jacqui
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Re: 1995 Discovery 2.5TDi - ECU codes

Marc,

Thank you for the info. As you say, I can see the OBD socket below the
fuse box cover but uncertain exactly to which ECU it connects. When
hunting for the ABS ECU under your guidance, I came across yet another
OBD-like plug hanging about behind the Glove Box. It gave no clues
what ECU that comes from.

Unlike Peters 96 Disco mine has plain old mechanical diesel pump
control so it is not exclusively for that!

If only someone could give me the details of what is what with all
these plugs and the "wake up" byte codes for this stuff I would go
ahead and write a computer program to suck all the error codes out and
done with it. Already got the baud rate issue sorted but certainly
Wabco is uncooperative on bytecode information.

Anyhow, I will keep on searching for the blue plug.

Tim

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Old 01-15-2006, 04:01   #6 (permalink)
Marc Draper
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Re: 1995 Discovery 2.5TDi - ECU codes

In message <1137263421.157579.139040@g49g2000cwa.googlegroups.com>,
Jacqui <jasnook@ntlworld.com> writes
>Marc,
>
>Thank you for the info. As you say, I can see the OBD socket below the
>fuse box cover but uncertain exactly to which ECU it connects. When
>hunting for the ABS ECU under your guidance, I came across yet another
>OBD-like plug hanging about behind the Glove Box. It gave no clues
>what ECU that comes from.
>
>Unlike Peters 96 Disco mine has plain old mechanical diesel pump
>control so it is not exclusively for that!
>
>If only someone could give me the details of what is what with all
>these plugs and the "wake up" byte codes for this stuff I would go
>ahead and write a computer program to suck all the error codes out and
>done with it. Already got the baud rate issue sorted but certainly
>Wabco is uncooperative on bytecode information.
>
>Anyhow, I will keep on searching for the blue plug.
>
>Tim
>



There will only be one OBD II plug that is the whole point. The OBD II
plug connects to all ECU's in the car. But yours is a bit of a change
over car.


As for writing your own software, I would not waste your time. wabco C
Type 3 on that age of landrover is hard enough to get the fault codes
from when using the genuine equipment. So you would be fighting a
loosing battle.

Just out of interest.....If you can't find the ECU and you can't find
the blue plug ......Are you sure you have ABS fitted??????

On a DIY basis you can get the flash codes once you have found the blue
plug.

My diagnostic system does say the blue plug can be found under the seat
but I have only ever found this to be true on Range Rover Classic.

The pin outs for the OBD II socket are:


Pins: 1,2,3,6,9,10,11,12---Not Used.
Pins 4,5--Ground.
Pin 7 Channel A bidrectional data(k line) for ABS and all EMS.
Pin 8 Channel D Lucas 10 AS Alarm
Pin 13 Channel B data in (L line) Used for airbag
Pin 14 Channel B data out (K line) Used for air bag
Pin 15 Channel A data in (L line) only used for wakeup on some systems
Pin 16 12 volts power.


Save you self a huge amount of time and get it booked into a good
independent specialist.
--
Marc Draper
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Old 01-15-2006, 06:01   #7 (permalink)
Jacqui
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Re: 1995 Discovery 2.5TDi - ECU codes

Marc,

Ok, Marc, I will give in with the software interface. I have finally
fixed the system using a multimeter on the 35-way plug. Wabco were
good enough to give me the pin-outs so I disconnected the plug,
connected the multimeter to each of the sensor connectors in turn and
drove around until I spotted an open circuit reading. Swapped out that
sensor and job done! As you say a new sensor is outrageously priced
but I managed to get a second hand one for 70.

You have confused me a bit with your OBD pinouts. Are you saying this
is how it is on my 1995 Disco or for OBD II later models?

Tim

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Old 01-15-2006, 07:01   #8 (permalink)
Marc Draper
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Re: 1995 Discovery 2.5TDi - ECU codes

In message <1137329124.899491.69390@g49g2000cwa.googlegroups.com>,
Jacqui <jasnook@ntlworld.com> writes
>You have confused me a bit with your OBD pinouts. Are you saying this
>is how it is on my 1995 Disco or for OBD II later models?



Glad to hear you have sorted it.

This is the problem with your age of Disco. The pinouts cover all Disco
300 tdis but if your disco is before the 95-96 change then you need to
use the 4 pin blue plug to diagnose the ABS with. As a rule of thumb if
the alarm fob has two buttons on it then you can use the OBD II
socket.....But as always with Landrover nothing is ever certain.

Good luck.
--
Marc Draper
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Old 01-15-2006, 10:01   #9 (permalink)
Jacqui
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Re: 1995 Discovery 2.5TDi - ECU codes

Marc,

Again, your help much appreciated.

Tim

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