I bought my 1990 Miata a year ago with the Link already installed and have just
gotten around to datalogging. I was horrified to find I had no knock signal
showing in the logs. The display when checked shows a zero level of knock at
all times. The wiring from the knock sensor to the MAP/knock box tests okay
with an ohmeter. I took the knock sensor off the motor mount, connected it to
the MAP/knock box and tried tapping on it - still 0 levels on the display. I
tried connecting an audio source, an mp3 player, directly to the RCA jack on
the MAP/knock box and still the display on the main ecu reads 0. It seems as if
the knock circuit in the MAP/knock box is hooped.
I had a look at the circuit board in the MAP/knock box and saw nothing obvious.
Does anyone know the voltage sent to the main ECU from the MAP/knock box at 0
knock?
Thanks
Cliff
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