MNR-0

Concerning a crank signal from an LS1 (24x reluctor wheel) we observe a typical hall effect square wave output. There is a hires and lores period. Which is what?

The reluctor uses 2 different width notches (12* and 3*) that are 15* apart.

So for example...

|'|_|'|,||_||_||_|'|,|'|,|'|... etc

96 Comp T/A

iTrader: (8)

Go here and see the diagram I posted. It details the trigger pattern degree by degree for both the cam and crank sensor. Applicable to the 2005 and earlier LS series engines.

http://www.msextra.com/viewtopic.php?p=155569#155569

If triggered off the trailing edge, you will end up with equidistant 15 degree events, 24 x per revolution.

joecar

I couldn't see your picture on that website... could you repost it here, please, thanks...?

96 Comp T/A

iTrader: (8)

Here you go. I took this from a Holden document I found out on the interweb. When I get home later this week I will try and find it and post a link.

MNR-0

Thanks "99 Comp T/A".

But it still deosnt tell me what is referred to as the hires and lores signal? Or am I missing something?

Is the lores signal the pulses which occur while the cam signnal is low (0v)?

96 Comp T/A

iTrader: (8)

The crank signal is high resolution, The cam signal is low resolution.

LS1curious

There are actually 3 patterns on that wheel with a unique 1/2 rotation identifier for determing cylinder pair is up within 1/2 rotation.

there is a 4x rising edge 8x trialing edge 24x trialing edge. The reason for the dual wheels opposing is to make sure there is no misignalling in the sensor from noise.

The sensor is a dual pole Hall Switch. Each pole sits on a sensor track.One when is high the other is pulled low.

this flips a transistor to either on or off. when the sensor is high the transistor is off and voltage goes to 5v when it on it pulls it to ground the transistor is on and the signal is pulled low.

for the life of me i cannot remeber which is which at the moment. If I am correct on this though it should be the wheel clossest to the front of the engine that is the actual wheel it reads from.

the camshaft position sensor should go High when cylinder 1&6 are up but only #1 is on TDC power stroke. The sensor should go low when #6 is on its TDC power stroke and #1 is on the exhuast stroke.

there is also a TDC marker in the crank wheel for pairs 1&6 at TDC for both cylinders. the cam orientation detrimines which is 1 tdc and which is not.