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Learning how to build Lotus Seven replicas...together!
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PostPosted: February 18, 2016, 5:23 pm 
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Joined: January 27, 2010, 1:11 pm
Posts: 540
Location: Jefferson City, MO
In my build my donor is a 96 Miata used a cable driven speedo. I am going with aftermarket autometer gauges and sourced a NB electronic speed sensor which I can use for the speedo. While working on my harness I found out the 96 ECU requires a speed input that it gets from the instrument cluster. without this input it will throw a P1502 or P1503 code.

How are those with builds using NA Miatas with mechanical speedo cables and aftermarket gauges getting a signal for the ecu to keep it happy?

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Chris
Build: NA Miata based +221 Se7en


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PostPosted: February 25, 2016, 10:22 pm 
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Joined: July 6, 2009, 11:50 pm
Posts: 177
I'm not sure about the later ones but I know my 1990 Miata doesn't have any speed signal whatsoever going to the ECU.


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PostPosted: February 26, 2016, 9:21 am 
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Joined: January 27, 2010, 1:11 pm
Posts: 540
Location: Jefferson City, MO
yeah the OBD I cars (90-95) don't have any speed signal to the ECU, the OBD II cars do.

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Chris
Build: NA Miata based +221 Se7en


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PostPosted: February 26, 2016, 12:32 pm 
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Joined: October 29, 2013, 5:15 pm
Posts: 176
A bit of cursory googling found a post on another forum that shows that the VSS signal going into the ecu is +5v square wave at approximately 4000 pulses per mile. Seems to me that the simplest option would be to use a hall effect sensor and a trigger wheel on the driveshaft.


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