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cam angle sensor 

 

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 Post subject: cam angle sensor
Posted: Sat Dec 16, 2006 4:40 pm 
Oompa Loompa
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backprobed the cam angle sensor on the ef and on each revolution the voltage stays the same ie. within first revolution the voltage was always 8.66v and within the next revolution the voltage was always 0.12v, seems to be alternating on each revolution. ive read that it supposed to be over 8v between 5 degrees BTDC and 45 degrees ATDC and under 1v at other times. im having cold idling issues, could this be the problem.
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Posted: Sat Dec 16, 2006 4:59 pm 
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Got access to a CRO? That would confirm/deny your suspicions.
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Posted: Sat Dec 16, 2006 5:10 pm 
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This is used by the ecu to determine which stroke cylinder one is on. It will be high on one stroke and low on the next. What you are seeing is correct.

 

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Posted: Sat Dec 16, 2006 8:53 pm 
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im no expert just trying to work out the problem im having myself, dont know what a cro is but if thats the way its suppossed to work then i wont worry about it.
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Posted: Sat Dec 16, 2006 9:23 pm 
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Might be your injector seals allowing air in.

 

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Posted: Sat Dec 16, 2006 9:26 pm 
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twason wrote:
This is used by the ecu to determine which stroke cylinder one is on. It will be high on one stroke and low on the next. What you are seeing is correct.


AFAIK thats not how it works. It just sends one short pulse around about the time that cyl 1 is a tdc on compression.

 

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Posted: Sat Dec 16, 2006 10:11 pm 
Oompa Loompa
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if there was a vacuum leak dont they usaully idle higher, im getting low idle on cold startup.

So if its suppossed to give a short pulse around tdc then what ive read is right and what im getting isint, i think.
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Posted: Sat Dec 16, 2006 10:22 pm 
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The cam angle sensor gives out a 12v square wave - it has a rising voltage around 5deg BTDC - 45deg ATDC and stays high till the next occurance of TDC, then it drops til next TDC and goes high, and so on.

So it does sound from what you've found is okay.

 

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Posted: Sat Dec 16, 2006 10:49 pm 
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ah ok, its alright then, thanks.
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Posted: Sun Dec 17, 2006 2:45 am 
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ive been told the cam angle sensor doesnt do a lot of the EF's? they will even run if its disconnected. true?

 

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Posted: Sun Dec 17, 2006 8:46 am 
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On LPG it won't matter squat if what i've been told is true - and thats that the cam angle sensor is responsible for working out when the injector should fire.

 

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Posted: Sun Dec 17, 2006 11:22 am 
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yes ef's do run fine without the cam angle sensor

 

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