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[Steve B]

Is this exactly how it works 

The ECU measures the speed of crank angle rotation constantly using the crank sensor.
The Crank Sensor listens to the teeth on a wheel on the crank shaft to pass it by.
There is normally a bigger tooth, or a missing tooth to determine TDC at cylinder 1.
If the Crank sensor detects the speed of one fire stroke is different from another, it regards that as a misfire.

[Steve B]

Is this exactly how it works 

The ECU measures the speed of crank angle rotation constantly using the crank sensor.
The Crank Sensor listens to the teeth on a wheel on the crank shaft to pass it by.
There is normally a bigger tooth, or a missing tooth to determine TDC at cylinder 1.
If the Crank sensor detects the speed of one fire stroke is different from another, it regards that as a misfire.

 

[plym ian]

Mate I think you've got a better chance of finding out how a woman's brain works than working out how a crank sensor works

[al brown]

Mate I think you've got a better chance of finding out how a woman's brain works than working out how a crank sensor works

Definitely, same applies to both. If its working, leave it alone

[Steve B]

Mate I think you've got a better chance of finding out how a woman's brain works than working out how a crank sensor works

Definitely, same applies to both. If its working, leave it alone

Oh i have no doubt what so ever that mine is working 100%

And it does do this too. 
If the Crank sensor detects the speed of one fire stroke to be different from another, it regards that as a misfire
Then you get a 300 code

[Nick W]

The crank sensor doesn't detect misfires! The ECU uses the crank sensor and cam sensor signals(at least to start with) to work out how fast the engine is turning and where in its cycle it is. That information is combined with the output from other sensors like throttle position, MAF, temperature etc, to inject fuel and fire the ignition coil appropriately.


Misfires are calculated from all the above together with information from the knock sensors.

[Steve B]

The crank sensor doesn't detect misfires! The ECU uses the crank sensor and cam sensor signals(at least to start with) to work out how fast the engine is turning and where in its cycle it is. That information is combined with the output from other sensors like throttle position, MAF, temperature etc, to inject fuel and fire the ignition coil appropriately.


Misfires are calculated from all the above together with information from the knock sensors.

Yep agree 100% with that;

And if i put a naffy plug in say cylinder 1,The power produced from that cylinder would be less than the other 5 and therefore the crank sensor working along with the cam sensor would detect this.. and the ECU would chuck a p0301 code up owing to the info it got from them sensors .. Is that correct

[05omegav6]

Yup, but the plug isn't necessarily the cause of the weak spark...

[Steve B]

Yup, but the plug isn't necessarily the cause of the weak spark...

What im saying Al is.. If a cylinder is lower in power than the other 5 you get a 300 code.. regardless of the reason why..
And if the ECU is sure of which cylinder,then you get a 30# code