Camshaft sensor Corsa c ohms reading?

[novalovingned]

Evening all.

I've found the Corsa forums to be utterly useless in the past so I'd thought I'd ask here.

Basically I need someone to tell me what the ohms and ac readings of a camshaft sensor should be on a z12xe 3 pin sensor. I would have thought a Haynes would have had the correct information but I don't own one.

Any info would be great, my eyes are sore looking through google

[Connor]

If this isnt answered by tonight i will have a look on autodata for you tomorrow, but i havent got time as im off to the pub now

[novalovingned]

If this isnt answered by tonight i will have a look on autodata for you tomorrow, but i havent got time as im off to the pub now

Lol good man! Priorities

Tomorrow is fine mate.

[Nobby]

Here you go pal -




Pin 3 is just your signal voltage by the looks of it so doing a resistance check doesnt really come into it you need to do a resistance check on pin 1 where you should get 0 ohms, by checking for voltage on pin 3 your doing a "volt drop" test and if your getting 5 volts there is no drop in volts or resistance if you get me. You can do a " Volt drop" test on pin one by putting the positve on your multimeter on the the + of the battery and then your Negative onto pin1 and if your getting a full 12v reading then you have no "volt drop" or resistance/short circuits. Apologies if im offending as i dont know what you know

[novalovingned]

Na not offending me, I'm thick when it comes to anything electrical!

Tested the ohms earlier on 2 separate camshaft sensors.

1+2 =0 ohms
1+3 =1.3 Mohms
2+3 =1.3 Mohms

2nd sensor

1+2= 0 ohms
1+3= 1.4 Mohms
2+3= 1.8 Mohms

What does this mean I was told that the M stands for million and these readings were massively over what they should be.

These tests were done with the sensor off the car.

[therealnovaboy]

This could be a good reading or a **** reading depending on what your measuring between.

If its Mohms (Mega Ohms) then it means there is a high resistance for current to flow between the two pins. This could mean that the coil is either snapped and has poor continuity between the two ends of the wire (or pins). Or it could mean that you ae going between two seperate wires that are insulated from each other I.E a High resistance between two separated wires so they do not short circuit. Which would be a good thing.

Untill you know what you are measuring your results dont really mean anything.

I would have thought that both are dodgey as at no point do you have continuity. Between any of the wires the current cannot flow between two pins.

Edit: just saw the diagram posted above pin 2 is earth(-ve) and the voltage is induced across pins 1 and 3. pins 1 and 3 is the coil and therefore should have a continuity ( a low resistance). Id have thought if you have your multimeter set to beep it would beep across pins 1 and 3. It should be much lower than Mohms and in the ohms range

[Nobby]

You need to test a known working one ideally pal as autodata only gives you the info for what you should be seeing at the plug not the actual sensor. MOhms is basically open circuit as they usally measure a high resistance but you shouldnt be anywhere near that

[novalovingned]

Ok thanks for everyones input just going to have to buy a new one and hope that it's the sensor and not something else.

[John]

Do you have fault code stored for the sensor? Timing chain ok?

[novalovingned]

Yeah fault code 0340 iirc, camshaft sensor.
Checked the chain, seems fine. It's getting fuel because I can smell it

It was running fine on the driveway and just cut out on idle. Immediately flashed the code.

Wasn't the only code that I got. Also had a faulty accelerator pedal sensor. Changed that, away to do the Tps on the tb just incase. Could be either.