MSefi.com read only forum (Jan.15,2018)

When i plug in the megastim v2.21 into my megasquirt2 v3.0 the fuel pump light is the only light on. Ive been told this is normal. after loading the firmware it flashes i have been told this is norml. Now i have no control over the coolant temp, intake temp, or throttle position, and i can only turn the air/fuel ratio just a hair to work but anymore it doesnt work. The only thing i can control is rpm's when it is on pnp. Now when i turn the knob for the tach signal the ig light turns on and the I1 and I2 lights start alternating on and off which i would consider normal but the fuel pump light shuts off. I dont think this would be normal bc for the injectors to turn on wouldnt the fuel pump need to be on also? There are three things that i have been thinking about doing that could be the issue. First i ws going to replace the crystal on the megasquirt pcb that is on y1. If that doesnt work i am going to try a new usb-to-serial cable because the one i have is the gigiware brand or something but ill try the one recommened by DIYAutoTune.com. If that doesnt work the only other thing i cn think of trying is to just replace the megasquirt daughtercard itself. Any information anyone can give me at all would be greatly appreciated.

The fuel pump light shutting off after a few seconds is normal. The fuel pump will shut off if it does not receive a RPM signal.
With out a sensor connected to any of the wires you will not have any control over the gauges by turning the pot nobs.

Thank you for the response. When i have the megastim hooked up and i give it an rpm signal by turning the pot the fuel pump light shuts off and the IG light comes on and I1 and I2 alternate turning on. The IG, I1, and I2 being on when i give the comp an rpm signal i would think is normal. but the pump light shutting off right when i give it the rpm signal i dont think is right is it? The pump light is always on after i plug in the stim until i give it the rpm signal by turning the pot then it shuts off. If i turn the rpm signal or pot off all the lights shut off and the pump light comes on again.

Check the signal from the processor to the fuel pump drive circuit - it comes in through the bottom side of R16. It should be 5 volts when the fuel pump should be on - e.g. when you have RPM. If the signal there is correct, sounds like a bad Q2, if the signal there is wrong, check for corrupted firmware.