 | Home > Puma (Tdci) > 2.4 Oil pressure warning light operation |
 
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| 4wd-junky Member Since: 31 Aug 2014 Location: UK Posts: 89  
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Over 70 views and no response
Maybe I should just be happy the light always goes out  |
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17th Jul 2017 1:29pm |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816  
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Only thing I can say is that on my Puma 2.4 the oil light always goes out immediately, irrespective if I start from cold, or restart from warm.
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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17th Jul 2017 2:38pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
if you think have problem use oil presser gage and check the oil presser
workshop Manuel below https://1drv.ms/b/s!AtZSoWFHDgnGhQoLf-ZCjkI5M0R7 |
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17th Jul 2017 2:59pm |
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| 4wd-junky Member Since: 31 Aug 2014 Location: UK Posts: 89
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Thanks Eric, that's interesting and makes me think I probably need to investigate this further.
Thanks dorsetsmith, that's a good idea, will need to invest in a gauge. Also, I've been thinking about connecting a temporary warning light directly to the switch in the conventional way to test if the ECM was actually causing a delay. |
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17th Jul 2017 4:15pm |
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| Thon Member Since: 22 Nov 2015 Location: Salisbury Plain Posts: 696
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If I start mine using the glow plug sequence the light goes out immediately. If I skip the glow plug sequence and simply start it, and I also get a delay.
AFAIK the oil pump is entirely mechanical so the likelihood is that it is not an oil pump problem. |
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17th Jul 2017 9:09pm |
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| 4wd-junky Member Since: 31 Aug 2014 Location: UK Posts: 89
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Thanks Thon, that's what I'm seeing.
It's like the ECM/IPAC is doing other things before it decides to turn out the light. From the manual: Low Oil Pressure Warning Indicator The low oil pressure indicator is controlled by the instrument cluster software and illuminated on receipt of a high speed CAN bus message from the ECM. The indicator is illuminated in a red color when the ignition switch is turned to position II. When the engine is started and the oil pressure increases the low oil pressure indicator should extinguish. If the indicator remains illuminated or illuminates when driving the vehicle should be stopped at the earliest opportunity and the engine switched off until the fault is rectified. |
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17th Jul 2017 9:28pm |
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| Thon Member Since: 22 Nov 2015 Location: Salisbury Plain Posts: 696
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Forgot to mention that if I skip the glow plug sequence the glow plug light also remains lit with the oil pressure light, and extinguishes at the exact same time as the oil pressure light.
I think it's just an anomaly of the instrument, and not indicative of low oil pressure. |
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18th Jul 2017 4:55am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638  
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I have not ever seen what the OP describes in my Puma, despited various types of restarts - hot, cold, medium, etc.
Check oil pressure sensor and connections? Any faults appear during a scan? -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged 
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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18th Jul 2017 6:29am |
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| Thon Member Since: 22 Nov 2015 Location: Salisbury Plain Posts: 696
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It's not to do with the temperature, it's to do with the starting sequence.
If you wait for glow plugs light to go out, then the oil pressure light extinguishes as the engine fires. If you skip waiting for glow plug sequence, the glow plug light and oil pressure light remain on for a second after the engine fires. No fault codes stored. I don't believe it is a "real" fault as the oil pump is entirely mechanical - it's just an anomaly with the way in which the instruments work. It's so consistent on my 110 with the starting sequence I just ignore it. Some might call it character ....  |
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18th Jul 2017 6:52am |
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| 4wd-junky Member Since: 31 Aug 2014 Location: UK Posts: 89
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Thanks again Thon and Naks
I wonder if the different low oil pressure warning light operation behaviours are software revision related? |
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18th Jul 2017 8:13am |
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| Thon Member Since: 22 Nov 2015 Location: Salisbury Plain Posts: 696
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I think it is entirely possible that it's software, but as mine has the latest available since it was serviced in March I don't think it's a known problem with a developed solution.
I just ignore the anomaly during starting but once running would obviously take notice and act accordingly should it light up. |
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18th Jul 2017 8:52am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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Just a note that when the oil pressure light comes on, it might be too late for your engine.
Rather fit an engine monitoring system like Madman, so that you can see the actual oil pressure in real-time. You can then set an alarm if it dips below 1.0. -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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18th Jul 2017 8:58am |
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| 4wd-junky Member Since: 31 Aug 2014 Location: UK Posts: 89
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Thanks Thon ....... I agree
It's amazing how something as simple as a low oil pressure warning light can get over engineered to the point it's operation is misleading  |
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18th Jul 2017 9:02am |
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| Thon Member Since: 22 Nov 2015 Location: Salisbury Plain Posts: 696
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Of course it might already be too late, but it's better to have the light than waiting for a rod to appear through the bonnet 
IIRC PUMA 2.4 motors are no more susceptible to oil pressure failure than most, and there was a story on here recently about an ex-development engine taking 30 miles to seize when run without any oil. It's not a pleasant situation to be in but a full crank seizure happened to me in our Subaru, on the A34 at 70 mph in the 2nd lane so i'm thinking statistically it's unlikely to happen to me again. Oh, and the same car did exactly the same to my wife on the A303 3 months later after it was "repaired", so i'm doubly covered. |
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18th Jul 2017 9:12am |
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