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Old 02-07-2009, 09:52 AM
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Crank Trigger and Cam Sensor

Wondering what the computer expects to see when it receives the crank trigger and cam sensor signals, Ford Mod Motor and GM LS. Where's the missing tooth supposed to be? Why does the computer need to see the cam

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Old 02-07-2009, 10:09 AM
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The ecm needs to know as they sequential fire the injectors. It needs to know where number one cylinder is.
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Old 02-07-2009, 12:13 PM
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Okay, I understand, but where in degrees is the missing tooth located, is that No. 1 at TDC or elsewhere? also, why does the computer need to know where the CAM is, to determine that No. 1 is in the compression stroke? Where in degrees does the cam sensor trigger?
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Old 02-07-2009, 01:02 PM
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What engine are we talking about here? Ford use a 36 minus 1 reluctor wheel and the place missing a tooth represent cylinder number 1. One tooth equals 10 degrees of rotation, 360 degrees divided by 36 teeth. Don't forget these are 4 stroke engines and the cam sensor is needed to determine which stroke the cylinder is on, be it intake, compression, combustion or exhaust. The LS1 used a 24x reluctor wheel, then switched to a 58x one later on.
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Old 02-09-2009, 03:48 PM
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Makes sense. Thinkin' about a 4.6 FORD Mod motor. Is it a fair guess that the missing tooth is TDC on No. 1?
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Old 02-09-2009, 04:55 PM
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Quote:
Originally Posted by tomtruty
Makes sense. Thinkin' about a 4.6 FORD Mod motor. Is it a fair guess that the missing tooth is TDC on No. 1?
Yes! You could make it any cylinder depending how you align the sensor.
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Old 02-09-2009, 05:59 PM
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Typically the cam sensor will be telling the ECU when #1 is approaching TDC for injector firing purposes. Crank trigger controls spark. You can make them anything you want but anything except what's correct will mean a non running engine.
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