seji

i have a 2000 miata running a speedy efi standalone ecu and it is not reading rpm during cranking and it says the wrong coolant temp "180" when the car is off. it has no fuel pressure as it lost it on the highway and the fuel pump is not receiving power.Relay has been replaced and the fuses have been checked

SimBa

Default coolant temp for Speeduino firmware is 180 IIRC. That would mean that your not getting a signal from your coolant sensor.

Did you by chance unplug the adapter harness recently? Make sure you got the pins aligned correctly on the molex connectors.