cam sensor trigger

kopisti · Post by **kopisti** » Tue May 20, 2008 4:13 pm

Could anybody tell me what triggers the camshaft position sensor on a Lanos?
Is there anything at the end of the camshaft which triggers the sensor, or it's only a gap?
It's a 1.4 engine.

Thanks

gse_turbo · Post by **gse_turbo** » Tue May 20, 2008 4:45 pm

the sensor is magnetic and reads off the cam gear. there is a thicker section on the back of the gear that the magnetreads off of when it spins around.

Garrett

kopisti · Post by **kopisti** » Wed May 21, 2008 11:05 am

gse_turbo wrote:the sensor is magnetic and reads off the cam gear. there is a thicker section on the back of the gear that the magnetreads off of when it spins around.

Garrett

Thanks Garrett but the thing is my one is an SOHC engine and the sensor looks like this:

When I took out the sensor I could feel a small gap on the camshaft. So either this is normal and this gap triggers the hall sensor or something has fallen off from here.

gse_turbo · Post by **gse_turbo** » Wed May 21, 2008 4:33 pm

sorry, i didn't see that you put 1.4 on the message.

I don't really know anything about the SOHC small blocks

Garrett

MMamdouh · Post by **MMamdouh** » Thu May 22, 2008 6:55 am

i recon it will work just like any cam sensor... isn't their a metal chunk or magnetic chunk on one part of the cam gear to create the magnetic pulse?

MMamdouh

kopisti · Post by **kopisti** » Thu May 22, 2008 2:30 pm

MMamdouh wrote:i recon it will work just like any cam sensor... isn't their a metal chunk or magnetic chunk on one part of the cam gear to create the magnetic pulse?

MMamdouh

I've checked it there is a metal chunk on the camshaft. I took out the sensor and connected a DVM, moving a piece of metal at the end of the sensor it switches between +5V and GND. When the camshaft is turning and the chunk reaches the sensor the voltage should drop to GND and when leaves the sensor it supposed to be +5V again. I checked the signal with a scope:

+12V, +5V and GND are look OK.
The sensor is new, what are the chances for this one is malfunctioning?
My last thought is that maybe the gap between the sensor and the chunk is not appropriate.

Pir0 · Post by **Pir0** » Thu May 22, 2008 4:05 pm

It's possible that sensor's failed also. Trace the wires from the sensor and make sure they're not broken somewhere.

kopisti · Post by **kopisti** » Wed Jun 04, 2008 10:58 am

I've made another measurement and my 12V looks like this at the sensor:

Could you tell me where is the main relay because I think this can cause such a surge.

Thanks

kopisti · Post by **kopisti** » Thu Jun 05, 2008 3:28 pm

Another thing: occasionally when engine starts the cooling fan switches on with cold engine. After a while it goes off.
I read somewhere if an error occurs the ecu switches on the fan.
I took out the sensor and moved a piece of metal at the end, it was switching like dream. (checked on scope).
Maybe if it has to switch with higher speed the transistor inside can't do this job properly. A hesitation can be seen on the picture I attached earlier. I run out of ideas.

kopisti · Post by **kopisti** » Fri Jun 06, 2008 4:15 pm

Do you know that whether an Aveo camshaft sensor works in a Lanos?

kopisti · Post by **kopisti** » Sat Jun 21, 2008 4:27 pm

Can anybody tell me for sure if there is a magnet on the camshaft which is turning around? (I don't think so)

Daniel · Post by **Daniel** » Sat Jun 21, 2008 4:40 pm

I think your cam sensor is a hall effect one and maybe has a internal magnet. Look under sensors for a explanation: http://apps.bosch.com.au/motorsport/pro ... efault.htm .
But at least you need to have "something different" material/density traveling on it's face.

Daniel