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C3 Sensomatic Will Not Crank Over


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#1 ww2rupert

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Posted 15 May 2018 - 09:41 PM

Hello
My wife has a 55 plate C3 sensomatic that has had some bad running and occasional stalling, the previous owner took it to a Citroen garage that said the stop start auto alternator connections were corroded and may need a new one, a year or so later i decided to clean the terminals on the alternator and now it will not do anything!!
I didn't know about the battery disconnect procedure and also lost windows radio etc!
I have rebooted the BSI and have everything back but will still not spin over the alternator to start, fault code reader says P1390 auto reverse alternator position sensor.
Have I buggered the alternator by just disconnecting the terminals and cleaning them?
Regards Colin
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#2 paul.h

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Posted 15 May 2018 - 10:07 PM

What code reader are you using ? On here and most other sites,  the fault code definition is P1390 Octane Adjust Pin Out Of Self Test Range. I do not know what this means though. Have you deleted the code and is this what still comes back ?

 

Did you disconnect the battery before disconnecting the alternator, if not then maybe a fuse has blown if live wires touched something.

 

You can check if the key is being recognised by the imobliser by leaving it in the ignition and opening the driver's door. If recognised then you ought to get a warning, if not then maybe the key needs initialising to the car.



#3 ww2rupert

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Posted 16 May 2018 - 07:47 PM

What code reader are you using ? On here and most other sites,  the fault code definition is P1390 Octane Adjust Pin Out Of Self Test Range. I do not know what this means though. Have you deleted the code and is this what still comes back ?
 
Did you disconnect the battery before disconnecting the alternator, if not then maybe a fuse has blown if live wires touched something.
 
You can check if the key is being recognised by the imobliser by leaving it in the ignition and opening the driver's door. If recognised then you ought to get a warning, if not then maybe the key needs initialising to the car.


Hello
I am using a snap on and an Autel scanner, both come up with same code and description, I did disconnect the battery first.
I've tried reinitialising the keys and still nothing! Immobilizer is off according to the scanners as well and keys are recognised.
Is there a fuse somewhere I don't know about?
Colin
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#4 paul.h

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Posted 16 May 2018 - 08:55 PM

As well as the usual fuses, there are maxi fuses which are not normally listed. Do a search to find where they are, I have tried but our internet is not working well.

 

Looking on the internet against that fault code and separately against the fault description does not come up with anything so if you cannot find anything obvious like a fuse or a disconnected sensor, then you may have to involve a Citroen dealer or specialist.

 

Some things on octane adjust pin

https://groups.googl...rer/WnJXnIIa-sg






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