Crank Angle Sensor Infrequent Issue

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Crank Angle Sensor Infrequent Issue

Postby tkdbboy » Wed Aug 30, 2017 4:49 pm

Hey guys,

Approximately once a month, when I go to start the car, it cranks but never turns.

I then unplug the crank angle sensor connector and reattach it, which then results in the car starting smoothly and operating fine.

I guess this points to an electrical / connector issue caused by it coming loose due to vibrations?
When I inspect the connector whilst it can't turn, it seems seated correctly.
When I reattach it, it makes a noticeable 'click' and seats firmly.

Any ideas on the issue?
Could there be a singular pin thats having a contact issue or maybe the wire has been bent too sharply that at a certain position it causes an issue? (I guess me wiggling the wire rather than unplug and plugging it in can determine whether this is the case)
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Re: Crank Angle Sensor Infrequent Issue

Postby jaydece » Wed Aug 30, 2017 9:54 pm

tkdbboy wrote:Hey guys,

Approximately once a month, when I go to start the car, it cranks but never turns.

I then unplug the crank angle sensor connector and reattach it, which then results in the car starting smoothly and operating fine.

I guess this points to an electrical / connector issue caused by it coming loose due to vibrations?
When I inspect the connector whilst it can't turn, it seems seated correctly.
When I reattach it, it makes a noticeable 'click' and seats firmly.

Any ideas on the issue?
Could there be a singular pin thats having a contact issue or maybe the wire has been bent too sharply that at a certain position it causes an issue? (I guess me wiggling the wire rather than unplug and plugging it in can determine whether this is the case)


The sensor if it is "hall effect based" could be faulty by nature and not the connections itself....

Is the sensor connections Burnt? Worn? Blacken? - Could be causing extra resistance for the sensor not to function properly also....
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Re: Crank Angle Sensor Infrequent Issue

Postby tkdbboy » Thu Aug 31, 2017 7:48 am

jaydece wrote:
tkdbboy wrote:Hey guys,

Approximately once a month, when I go to start the car, it cranks but never turns.

I then unplug the crank angle sensor connector and reattach it, which then results in the car starting smoothly and operating fine.

I guess this points to an electrical / connector issue caused by it coming loose due to vibrations?
When I inspect the connector whilst it can't turn, it seems seated correctly.
When I reattach it, it makes a noticeable 'click' and seats firmly.

Any ideas on the issue?
Could there be a singular pin thats having a contact issue or maybe the wire has been bent too sharply that at a certain position it causes an issue? (I guess me wiggling the wire rather than unplug and plugging it in can determine whether this is the case)


The sensor if it is "hall effect based" could be faulty by nature and not the connections itself....

Is the sensor connections Burnt? Worn? Blacken? - Could be causing extra resistance for the sensor not to function properly also....


I haven't removed the actual sensor for inspection yet, nor just removed it all.
I'd imagine it was an issue with the sensor itself that unplugging the connector and putting it back on would have no effect but it has a 100% success rate currently
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Re: Crank Angle Sensor Infrequent Issue

Postby tom_kauf » Thu Aug 31, 2017 1:57 pm

Like jaydece suggested, have a look at the sensor connector. You mentioned a 100% success rate with reseating the connector. Since that's the case, have a look at the pins on the connector. Any dirt or burnt spots on them? Gently pull on the wires and see if anything looks loose.
Put some contact cleaner or cleaning alcohol on the contacts on both ends. If if it's a bad contact, that will help.
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Re: Crank Angle Sensor Infrequent Issue

Postby tkdbboy » Thu Aug 31, 2017 4:19 pm

Apologies jaydece, I was half asleep when I read your reply.

Will do! Cheers
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Re: Crank Angle Sensor Infrequent Issue

Postby jaydece » Sat Sep 09, 2017 9:47 pm

tkdbboy wrote:Apologies jaydece, I was half asleep when I read your reply.

Will do! Cheers


Good luck....hope its nothing major...
~JUSZTN~

** Our Turbo Lag Gives Those v8's A Chance **

Past - MY07 Liberty TBSTI 6SPD Sedan
265kw atw on P100
290kw atw on E85(fuel pump limited)


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Present - MY18 Audi RS3 Sedan (His)
Present - MY17 VW Tiguan 162 R line (Hers)
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