04-07-2014, 08:41 AM
Join Date: Feb 2012
Location: Johnson City, Tn
Total Cats: 1
No crank signal - with 36-2 trigger wheel
I have posted thsi on other forums, but I probably need a Miata expert
I have a MS3 with MSx on an 03 Miata engine. Using latest firmware and tunerstudio.
I am using a Flyin' Miata 36-2 timing wheel and am using it in TS as well.
It looks like I am getting a CAM signal but not crank signal. I have seen that I am getting 12v and good ground to the sensor, but do not have an oscilloscope to see if I am getting something out. I have adjusted the pickup so it is VERY close to the timing wheel. I verified that the sensor wire runs from the connector to pin 25. I have verified ground and 12v as well (all of my grounds go back to the same few connections as I checked the MS and they all were the same)
I have set the MS3 up as:V3.0 board - VR Input with pullup for hall sensors, LS2/58X, optical sensors or points
a) Solder a link between VRIN and TACHSELECT
b) Solder a wire between VrOUT and TSEL
c) Install a 1k resistor (any value 470R - 2k2 is likely ok) in the proto area. Connect one end to the 5V hole and join the other end to VRIN with a jumper wire.
d) With a small screwdriver, turn the pots, R52 and R56, about 12 turns anticlockwise (sometimes you may feel a "click" when the end position is reached, they can't be damaged by turning too far.) and then turn R56 back about 6 turns clockwise.
BTW, I am fairly confident in the circuit as it works with the JimStim as a 99-00 Miata
I am leaning toward it being a bad crank angle sensor but not sure. Seems like if I have 12v and good ground going to the sensor and the signal wire is in the right spot, that I should see something in TS.
I know that I am missing something simple, but am brain dead.