Speed sensor question

[chetwagner at uswest.net]

I have a circuit that should work for what you want.  It uses an op-
amp to change the sine wave to a square wave output.  

On 25 Oct 2000, at 1:32, WEG1192 at aol.com wrote:

> Anyone know how to use a stock cruise control speed sensor on a 7747 ECM? I 
> am trying to use a Jeep cruise control speed sensor and interface to a 7747. 
> I measured an increasing A/C voltage with speed that gave 1.7 VAC at 30 MPH 
> with this sensor connected directly to my DVM. I couldn't tell if the 
> frequency was varying also, but it probably is. I was told that the TBI ECM 
> needs a square wave input. Is there a cheap and dirty circuit that will 
> convert this A/C signal to the proper signal without affecting the cruise 
> control box? I'll be glad to pay for any helpful suggestions. I don't care if 
> the sensor gives me the right speed, I just need to reset the idle speed 
> control logic so my IAC motor will work correctly. If I have a legit TCC 
> lockup requirement, I'll spring for the right sensor.
> 
> Thanks,
> 
> JW
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