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Clutch Actuator Circuit High P0903 - permanent
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scooby driver
 


Member Since: 02 Jan 2011
Location: London
Posts: 145

2006 Discovery 3 TDV6 S Manual Arctic FrostDiscovery 3
Clutch Actuator Circuit High P0903 - permanent

I have transmission range not available on the dash display with the above fault I think being the key one indicated on my MSV 2 - trying to reset the fault results in the the low and high range lights by the switch flashing and the dashboard lights for hill descent flashing and an orange brake light

Turning ignition off and on again resets the light flashing but the fault returns

Prior to this I had park brake fault and special programs off

Any ideas gratefully received  
Post #12137977th Jan 2014 11:43 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20783

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Check the transfer case ECU for water ingress. Very common issue Thumbs Up My D3 Build Thread

TDV8 Retrofit Build Thread  
Post #12138738th Jan 2014 7:42 am
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Dave^
 


Member Since: 23 Jun 2013
Location: West Yorks
Posts: 706

Make sense going by his avatar! Thumbs Up flickr  
Post #12138808th Jan 2014 8:01 am
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scooby driver
 


Member Since: 02 Jan 2011
Location: London
Posts: 145

2006 Discovery 3 TDV6 S Manual Arctic FrostDiscovery 3

That was a long time ago - it was actually sunny them!!

Cheers I will have a look

I assume it's unlikely to be the actual actuator in that case  
Post #12139868th Jan 2014 12:30 pm
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scooby driver
 


Member Since: 02 Jan 2011
Location: London
Posts: 145

2006 Discovery 3 TDV6 S Manual Arctic FrostDiscovery 3

Took the ECU out no evidence of water ingress all connectors good and no corrosion. Battery voltage is also fine 12.59, 15.50 when running

There are a number of other faults on list on the faultmate for other items such as the ABS comm failure with transfer case in addition to other intermittent comm failures with come the other control units such as vehicle dynamics

I am thinking it looks like I need to replace the transfer case but before I spend the money on that could it be anything else

One other thing i did notice when I took the transfer case out was that it was quite warm (the car had not been used for about 5 hours but I had the ignition on going through the fault codes). Is this normal?

Could it be anything to do with the ABS sensors?  
Post #12149209th Jan 2014 11:15 pm
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scooby driver
 


Member Since: 02 Jan 2011
Location: London
Posts: 145

2006 Discovery 3 TDV6 S Manual Arctic FrostDiscovery 3

Well its definitely the transfer case ecu - I decided to take it apart for interest (chip towards bottom is split and melted)





However if I get a new ecu is this likely to happen to the new box as well its an electrical fault to positive which is very unusual in my experience in a vehicle  
Post #121569211th Jan 2014 12:54 pm
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scooby driver
 


Member Since: 02 Jan 2011
Location: London
Posts: 145

2006 Discovery 3 TDV6 S Manual Arctic FrostDiscovery 3

New ECU fitted and now all Ok  
Post #124446527th Feb 2014 11:18 pm
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CUCO
 


Member Since: 27 May 2011
Location: Spain & Oleee!!!
Posts: 609

Spain 2010 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

did you consider a new chip?

sure so cheap vs new complete module  
Post #124448627th Feb 2014 11:49 pm
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Valhalla
 


Member Since: 23 Oct 2011
Location: Isle of Skye
Posts: 124

Scotland 

It's only a Field Effect Transistor that has blown there. Less than £10 before VAT to buy one of these through the post.

Very rare for an integrated circuit to fail like that, but a FET is on the output to all sorts of things that need switching in the gearbox. Might be worth getting the old unit checked for the pin that is connected to your failed FET, just in case the component being switched is faulty (or wiring to same).  
Post #124452328th Feb 2014 1:20 am
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scooby driver
 


Member Since: 02 Jan 2011
Location: London
Posts: 145

2006 Discovery 3 TDV6 S Manual Arctic FrostDiscovery 3

I checked the wiring for integrity and shorts and all appeared OK - I still have the ECU so could replace the chip but my soldering is not the best

In addition I couldn't read the details on the chip to purchase a new one - if anyone can give me the details I might purchase one and give it a try  
Post #124505628th Feb 2014 11:52 pm
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Valhalla
 


Member Since: 23 Oct 2011
Location: Isle of Skye
Posts: 124

Scotland 

Google BTS244Z, and it will come up with several suppliers of this transistor (strickly speaking, not a chip!!!). I think that there might even be one on Ebay from Littlediode;

Ebay item eBay Item No. 171121081719

These are fairly easy to solder, you just need to be prepared with a clean work area and fresh fluxed-solder to hand. Not as many problems as laying down SMD integrated circuits, etc.  
Post #12450801st Mar 2014 1:21 am
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