Speed sensor on FB. I think I may be onto something...
#1
Damn, it did start!
Thread Starter
Speed sensor on FB. I think I may be onto something...
In short, the cruise control on the FB used a speed sensor on the speedometer. a signal is sent out from the cruise control box and ran through the "vehicle speed switch" . It would seem that selecting the Vehicle Speed Input using a DPI with the main source as Drive Train Sensor with Edge Select as Falling and calibrated at the Mazda 1024 pulses@ 60 MPH would provide the ECU with a signal.
That is at least my theory.
That is at least my theory.
#2
Rotary Enthusiast
Cool. Where are you getting the value of 1024 pulse count at 60 MPH?
If you have an oscilloscope or DMM with a frequency count function, you could drive the speedo cable with a handheld drill.
If you have an oscilloscope or DMM with a frequency count function, you could drive the speedo cable with a handheld drill.
#3
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i'm not sure what the signal looks like (i think its an AC voltage? ive never bothered, the ecu doesn't need it), but you're on the right track
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