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Home > Technical > crankshaft position sensors keeps failing |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2071 |
Are you using genuine sensors? Hyundai Ioniq 5 Ultimate. The family car.
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6th Jan 2021 3:28 pm |
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impact Member Since: 11 Mar 2011 Location: Perth Posts: 139 |
Yes, all genuine. MY10 TD4 SE Auto |
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6th Jan 2021 3:48 pm |
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Andy131 Member Since: 09 Dec 2009 Location: Manchester Posts: 2175 |
If it’s a three wire device it should have live, negative (earth), and signal. So a faulty earth might cause the signal to go high ie a 12v device might give a 5v signal normally but lose negative and the signal might go to 12v - this should kill the ECU.
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6th Jan 2021 4:06 pm |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1529 |
I had trouble with a brand new sensor. Bought another one from an LR specialist, they told me they only fit genuine LR ones because of problems using others. Been running fine for must be a 18 months or so. |
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6th Jan 2021 7:01 pm |
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impact Member Since: 11 Mar 2011 Location: Perth Posts: 139 |
Thanks very much for the detailed explanation Andy. I’m ok on the tools but intermittent faults can be a real nuisance. With first 2 sensors there would be a brief loss of power while driving and nothing else. The error codes would only appear when sensors where completely dead and the car would not start. This could possibly mean that a code is only triggered when there’s an open circuit. With the current (3rd) sensor, there was a brief loss of power while driving and 2 DTC appeared (p0335 and p0336). So the dynamic is slightly different I thought, and could indicate that the circuit was briefly interrupted. With that in mind, this morning I removed factory earth cable, cleaned it all out (even removed paint at the seat) and bolted it back on (covered any exposed metal in clear). I also installed additional earth strap (400A) from the negative terminal to the bell housing, just in case. Any idea whether ECU gets its earth from the body or the engine block? MY10 TD4 SE Auto |
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7th Jan 2021 6:58 am |
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Andy131 Member Since: 09 Dec 2009 Location: Manchester Posts: 2175 |
wiring diagram is attached
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7th Jan 2021 9:58 am |
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impact Member Since: 11 Mar 2011 Location: Perth Posts: 139 |
Couldn't work out where the ground wire attaches on the vehicle to inspect the connection so I just checked for voltage drop across all earth points I could see (inspired by Scotty Kilmer), and body of the ECU. No voltage drop at all - which is very good I believe. Didn't do the test prior to cleaning factory earth contact as wasn't aware of the method at the time. Hopefully this does the trick.
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7th Jan 2021 1:39 pm |
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impact Member Since: 11 Mar 2011 Location: Perth Posts: 139 |
All sorted. The problem was with the crankshaft sensor connector / plug. If anyone is having the same problem and would like to get it fixed, read my comments here (link below) or send me a message to discuss further:
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1st Aug 2021 2:08 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2071 |
My crank sensor failed 80 miles into a 180 mile journey. There were 2 codes generated (I didn't note them), but were crank sensor related. Luckily I had the old sensor (the one on the engine was only 2 years and 4,000 miles old), so I fitted the replacement sensor, and continued my journey, and back without any more failures, although I do still have the occasional dropout of one cylinder, particularly if I use significant throttle.
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14th May 2022 7:53 am |
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Cherokee Member Since: 12 Jun 2018 Location: Portishead Posts: 76 |
I had drop outs & into limp mode with no EML lights, whilst under acceleration.
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14th May 2022 9:37 am |
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AndyP Member Since: 09 May 2007 Location: Reading Posts: 101 |
I had exactly the same issue, the fix was to tighten the socket pins in the plug. Easily done with a small , watchmakers, screw driver. If you have the replacement pin set mentioned in the other post, then you can gauge whether the socket is a tight push fit using one of the spare pins. Safe in knowledge that if the socket does break you have the spare to create a new one. |
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4th Jun 2022 6:46 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2071 |
I've had a new Delphi crank sensor delivered, along with 2 new plugs with gold plated connectors and 3 lengths of silicone insulated 0.5mm wire, so that I can replace everything from the ECM to the sensor.
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4th Jun 2022 7:58 pm |
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Arctic Member Since: 24 Aug 2016 Location: Westmidlands Posts: 556 |
I have just ordered a couple of crank sensors due to drop out last Saturday on the way to out Nano meet, since then i have had two cut outs, checked battery it was a bit low and seeing it was 7+ years old i have replaced that too.
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31st Jul 2024 9:30 am |
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Arctic Member Since: 24 Aug 2016 Location: Westmidlands Posts: 556 |
Today the new crankshaft sensor was fitted, and all seems well again after a drive, i fitted the Febi sensor below.
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3rd Aug 2024 9:54 pm |
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