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Oil pressure light in D4 3.0 and 2.7
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CUCO
 


Member Since: 26 May 2011
Location: Spain & Oleee!!!
Posts: 599

Spain 2010 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4
Oil pressure light in D4 3.0 and 2.7

Anyone knows why the D4 3.0 and 2.7 have not oil press light if there are an oil press sensor?

We dont understand why there is no warning if there is a oil related problem as it could lead to a catastrofic failure.

(the sensor is there, cable too, but no red light in cluster even tested leaving it disconected, bridged to earth, engine on, off, waiting 10 minutes,....,whatever we try: no warning light)

Oil press sensor running ok, tested with multimeter

Various D4 3.0 and 2.7 owners asked: no red light
  
Post #137474317th Nov 2014 12:45 am
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Robbie
 


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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Never seen a D3 or a 2.7L without an oil pressure light and aside from oil pressure failures they have all come on with the ignition and gone off shortly after engine start. D4 3.0L oil level warning is through the message centre and only comes on when there is a detected problem. It would be great if there was a pressure transducer for the oil so you could see real pressure on a diagnostic tool rather than having to screw in a gauge to check oil pressure.
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Post #137475117th Nov 2014 6:57 am
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Dudleydisco
 


Member Since: 20 Jun 2014
Location: York
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United Kingdom 2014 Discovery 4 3.0 SDV6 XXV LE Auto Causeway GreyDiscovery 4

I've just checked mine (MY13 HSE), and according to the handbook, the oil pressure warning light is between the Battery Warning Light and the Red Triangle at the top of the driver's display. However, mine doesn't illuminate with either the ignition on, or at start up as part of the lamp check.

Is this normal, or have I got a bulb failure? Just for info, there's no faults showing on my IID Tool.
 D4 MY14 XXV - RLD/IID BT
D4 MY13 HSE Lux - RLD/IID BT
P38 RR - Sad parting
110 - Even sadder parting
S3 88" - Still going strong after 23 years of ownership Smile

 
 
Post #137482417th Nov 2014 10:09 am
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

As already described above, the D4 3.0L does not appear to have an oil pressure warning to the dash before start, but it does benefit from an oil level warning which is displayed on the message centre.

I'm not particularly convinced of the wisdom of this setup, even though the oil level warning is a good enhancement.
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Last edited by Robbie on 19th Nov 2014 3:53 pm. Edited 1 time in total 
Post #137487817th Nov 2014 12:45 pm
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CUCO
 


Member Since: 26 May 2011
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Spain 2010 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

I don't like too the omission of the red oil press light.

The oil level warning is ok, but, if the engine is on and there is a leak or a filter problem, you couldn't be aware until too late.

there are people here who realised a bad filter install by seeing the oil pressure light flickering for example...so...

I think is a primary mechanical warning for the intregrity of the engine.
  
Post #137489817th Nov 2014 1:12 pm
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CUCO
 


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Spain 2010 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

my helper was bridgeing the plug to earth...touching plastic.....so imposible to the light to be on. Rolling Eyes Laughing

results:

light dont go on when just ignition on, I mean when precheck is performed.(why it don't is on when precheck....is a mystery to me)

light go on when engine on and well bridged to earth.

the light is timed, there is a delay of 5 seconds, so unusable in a road for saving the engine.

here is the light trigered on by a paper clip. no message on the screen


Click image to enlarge
  
Post #137509017th Nov 2014 7:01 pm
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Robbie
 


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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Interesting - so it just needs earthing for 5 seconds or so to trigger the warning?
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
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Post #137509517th Nov 2014 7:08 pm
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Dudleydisco
 


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United Kingdom 2014 Discovery 4 3.0 SDV6 XXV LE Auto Causeway GreyDiscovery 4

Interesting! I phoned LR Customer Relations and spoke to a lovely lady who admitted she wasn't technical! All she could do was recite what's in the handbook and didn't seem to grasp the difference between an oil PRESSURE problem and an oil LEVEL problem. She suggested that I spoke to my dealer, as she didn't have access to LR Technical Rolling Eyes

I then rang my dealer, who let me speak to one of their 'Techs'. His understanding was that in the D4, the oil pressure light wasn't part of the lamp check on startup, but was actually there and would illuminate if there was an oil pressure failure.

I had a look on Topixx, and it was interesting to note that from MY15, the paragraph about the oil pressure light illuminating during startup has been deleted.
 D4 MY14 XXV - RLD/IID BT
D4 MY13 HSE Lux - RLD/IID BT
P38 RR - Sad parting
110 - Even sadder parting
S3 88" - Still going strong after 23 years of ownership Smile

 
 
Post #137516217th Nov 2014 8:29 pm
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Robbie
 


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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Mystery solved!

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 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #137516517th Nov 2014 8:31 pm
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Dudleydisco
 


Member Since: 20 Jun 2014
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United Kingdom 2014 Discovery 4 3.0 SDV6 XXV LE Auto Causeway GreyDiscovery 4

Just to update on this one, I've PM'd Pete@Landrover to ask him for verification of what the Oil Pressure light should do on what model years.
 D4 MY14 XXV - RLD/IID BT
D4 MY13 HSE Lux - RLD/IID BT
P38 RR - Sad parting
110 - Even sadder parting
S3 88" - Still going strong after 23 years of ownership Smile

 
 
Post #137605719th Nov 2014 2:00 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

I guess all Pete will confirm is what is stated on Topix. What we have learnt here is that there is a 5 second delay from the switch being pulled to ground before the light comes on; Topix gives no description of this pause. The early MY owner's manual also appear to be in error, but corrected in the most recent edition.

So that leaves the one big point. The EOP warning on this engine will not detect a fluctuating oil pressure. If this engine experiences a degraded oil flow, such has happened on a number of 2.7L D3s, this indicator will not provide a warning until the oil pressure decays below the switch value for over 5 seconds without even a momentary fluctuation above the switch limit in that 5 second period.

Looks like madness to me, but I would welcome other opinions.

Exclamation
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #137610819th Nov 2014 2:58 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

For those who want to see if their particular model year behaves the same way here is the simple test:

Remove engine cover, remembering to replace the oil cap, and locate the Engine Oil Pressure Sensor. It is a simple pull to ground switch with a single grey (slate) wire located at the front of the left hand bank, near the air manifold split and the EGR pipe:

Click image to enlarge


I should have used a different back-probe colour than black, but a closer shot of the test lead inserted into the sensor plug:

Click image to enlarge


With the car running you can then trigger the warning whilst sitting in the seat by simply grounding the other end of the test lead. There are a number of exposed fasteners in the door jam that provide a good ground.

For my own MY13 after a 5 second pause the light on the dash comes on:

Click image to enlarge


You can simulate a fluctuating pressure by providing an intermittent contact. The light on mine does not latch-on and goes out as soon as the ground is removed, but does not come back on unless it has been constantly grounded for over 5 seconds. Unlike the D3 the sensor warning does not go direct to the instrument cluster and is just an input to the Body Control Module, which in turn sends a signal to the instrument cluster to trigger the light.

This needs a fix otherwise we will have catastrophic failures that could have been avoided. JLR could introduce a revised BCM load that would latch the warning on if the pressure switch signal fluctuates.

Sorry about the grainy iPhone 4 pictures.

Neutral
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 


Last edited by Robbie on 19th Nov 2014 4:14 pm. Edited 1 time in total 
Post #137614019th Nov 2014 3:44 pm
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CRC@LandRoverVerified Account
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Member Since: 12 Oct 2012
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United Kingdom 

Hi All,

Rather than quote TOPIx which I am aware several members will have already looked into, I am looking to see if I can gather some further information regarding this. Please be assured that as soon as I have more information I will be responding.

Many thanks,
Pete
  
Post #137616219th Nov 2014 4:13 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Thanks Pete, having run a few tests this afternoon this does look like a problem with the BCM fault warning logic. The EOP sensor itself is fine.

Thumbs Up
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #137616619th Nov 2014 4:20 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: Waiting for my old avatar to be allowed back... we miss her!
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Can any of the MY15 owners run the same test?
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #137635919th Nov 2014 9:54 pm
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