Home > Technical (L322) > disappearing fault when switching engine off/on - p023d (22) |
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Jayk69 Member Since: 08 Feb 2018 Location: Daventry Posts: 601 |
the code is an indication of sensor failure. you state that the MAP & MAF's have all been replaced. Were they replaced with genuine LR parts or were they OEM made by Bosh or one of the OEM mfr's?
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23rd Nov 2022 8:15am |
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jimmie Member Since: 19 Jul 2014 Location: Warsaw Posts: 162 |
iid tool or any other which can draw graphs will be helpfull. Draw the sensors values and turbo valves, and try to find when it goes wrong and what parameter fails first. |
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23rd Nov 2022 8:21am |
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GraemeS Member Since: 06 Mar 2015 Location: Wagga area Posts: 2486 |
Swap MAPT and MAF sensors left and right to see if the fault swaps sides.
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23rd Nov 2022 10:00am |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
HI Jay Absolutely agree, I have only used parts from main dealer. Have learnt that early on. If it was sensor then why would the fault go by switching on/off and not come back no matter how many times tackling the same hill. Only when removing the key and starting up again, does it happen again. Thanks for the response. |
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23rd Nov 2022 12:03pm |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
Hi the techs have said they have looked at this and it's not helped them. I have not looked into this myself. |
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23rd Nov 2022 12:04pm |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
Hi, thanks for the reply, iv had three smoke tests at two different garages. It's all tight, nothing highlights even the slightest leaks. Swapping the sensors doesn't change the side, it's always side A. (Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation) Thanks for the reply. |
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23rd Nov 2022 12:07pm |
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GraemeS Member Since: 06 Mar 2015 Location: Wagga area Posts: 2486 |
Could be caused by sticky turbo actuator linkages. |
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23rd Nov 2022 7:41pm |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
Hi Graeme, there were both checked over by tech and said they moved freely, also had drivers side oiled recently whilst car went in for front linkage arm, aparantly n/s is harder to get too. But with the fault code throwing up an A side sensor which would indicate a fault on drivers side on rhd car, I thought best to get it oiled.
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23rd Nov 2022 8:24pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
Has anyone measured the actuator commanded position & current, ideally with a scope? there are specific waveforms to look for if the actuator control detects a potential jam and runs an 'unstick' routine - there are no DTC's set by this process, only by a failure to achieve required boost. Even if the actuator & arm are 'free' then it's possible the turbo vanes and gimballs are sticking or causing excessive current draw under certain load / temperature conditions. |
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23rd Nov 2022 8:38pm |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
Hi Phoenix, the turbos are new. And the actuators have been ruled out by the turbo specialist, now they didn't charge me and could have billed me just to strip them down to get them out and I would not have been the wiser, so that's why I think it's definitely not actuator related.
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23rd Nov 2022 8:57pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
I'm not saying the actuators are potentially the issue, they may be drawing excessive current due to the vanes / gimballs in the turbo not moving under specific conditions. Just looking at the actuators & link rods is confining the inspection & testing to only half of the mechanism, although you say 'hot or cold', obviously the turbo will warm up pretty quickly with hot exhaust gases and friction. sdo in reality it's 'hot or hotter'.
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23rd Nov 2022 9:16pm |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
Hi Phoenix, you make some good points.
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23rd Nov 2022 9:33pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
That's a good point about the vacuum system - has it been thoroughly checked? I see a lot of turbo / EGR / control system faults that come down to vacuum leaks, defective valves / solenoids, even vacuum pumps. The brand I'm currently working for (not JLR!) has a lot of issues with oil ingress and contamination that manifests itself with DTC's pointing in entirely the wrong direction.
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23rd Nov 2022 9:47pm |
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RRR4J Member Since: 22 Nov 2022 Location: West Midlands Posts: 12 |
Yeah, the vacuum system has been ruled out since.
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23rd Nov 2022 10:06pm |
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