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astra g cam sensor fault

Posted By wolfie28 6/14/2010 4:22:08 PM
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wolfie28
 Posted 6/14/2010 4:22:08 PM
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Looking at my friends car today, complained of spanner light comong on, poor idling, revs peaking at 3500 to 5000. Plugged in with snap =on and autoboss scanners and both returned same code. P0340-0 camshaft sensor incorrect signal. Done a continuity check back to the ecu and all three wires check ok. there is a 5 volt feed between pins 2&3. tried a new sensor to no avail. any help as always appreciated!

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AVC
 Posted 6/14/2010 5:00:22 PM
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Do you have a signal from the cam sensor? if so do you have a cam sensor signal at the ECU

Continuity does not prove the wiring is OK.....


Regards Darren


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6/14/2010 5:01:08 PM by AVC
topbloke
 Posted 6/14/2010 5:13:49 PM
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Hi is that sub code 0 (zero) if so this is the definition to that sub code

This category includes standard wiring failure modes, direct

current quantities related by Ohm's Law and quantities

related to amplitude, frequency or rate of change, and wave

shape

 i assume that dont help much BigGrin, okay can you scope the cam sensor, the actual description for that code is the speed signal is recognised (engine) camshaft signal not recognised, basically the ecu cannot sync them so i would check the signal output at the sensor then check it again at the ecu (to make sure the signal is arriving )  Has it had any work done lately we/i have had a surge on these knocking the camshafts out, lobes worn out, has someone changed the camshaft, the other thing to check is the physical relationship between crank and cam (has the woodruff key chewed its self out  not unknown !!!!),Regards TB

wolfie28
 Posted 6/16/2010 4:30:20 PM
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Thanks for your replys. It has had no recent work carried out, but i did strip the belt off and checked all pullys and keys and all were fine. i have a friend with a scope so when i get to look again ill keep you posted!
smh
 Posted 6/19/2010 10:20:30 AM
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Wolfie28

You will have to recheck the voltage supplies at the sensor. You should have 2 5v feeds to the sensor, 1 power and 1 signal, plus a earth. T1 is 5v from ECU power, T2 is 5v signal from ECU, T3 is sensor ground. If as you say you only have 1 5v feed then that loss will be the problem. Sometimes this code is accompanied by an EGR position sensor code, do you have that as well?

smh

Hammond_Auto
 Posted 6/20/2010 7:59:37 AM
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Did you fit a genuine cam sensor? I only ask as I had a similar fault but on an older Astra, the wiring to the original sensor had fallen apart and the wires were touching eachother and the block, I removed and put on a patern part and the car would not start at all, put on another patern part from another motor factor (was told it was genuine but in a different package), the car would run but only after lots of cranking, then I put on a genuine Vauxhall boxed part from my local Vaux dealer and had no problems since then......
rudi
 Posted 6/20/2010 1:52:20 PM
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Getting the right diagnosis is difficult enough, but a post like the one above from "smh" makes the job even more confusing.

Could smh, please, come back and expand a little more on his post.  

rudi

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smh
 Posted 6/20/2010 4:00:11 PM
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Rudi

Not sure why it would be confusing if you understand how the cam sensor works. I gave the terminal numbers to check, the expected results and the identification of the problem if the results he quoted were correct. This would enable correct diagnosis. The question regarding the EGR valve was put due to the fact that the power feed is shared with the EGR potentiometer and may have provided more evidence. All the information is there and if you read the results in his first post then the problem has in fact already been diagnosed.

Perhaps the confusion has arisen because you believe the sensor produces its own voltage and only has one 5v feed. This type of sensor works by controlling  / switching a voltage on and off to earth hence the square wave. This voltage is provided by the ECU as well as the sensor power and earth lines. In point of fact the hall IC actually produces an analog signal not the square wave signal that is seen. This comes from the switching circuitry within the sensor.

Hope this meets with your approval

smh

seancombs
 Posted 8/16/2012 12:49:18 PM
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hi iv got same problem are they on same circuit?
Angus
 Posted 8/16/2012 1:30:28 PM
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sean

This is a dead thread; start your own with full vehicle details and all available information about your fault.


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