Megasquirt diypnp wont start anymore
#1
Megasquirt diypnp wont start anymore
installed diypnp for my 2001 miata and I had it idling nicely and fine, then it stopped starting. It will idle for about a second then die. It runs perfectly fine with the stock ecu. The only thing I can remember changing was under idle settings from 15 minute iac to pwn warmup. Must have ruined my iac valve because it makes no difference in idle with stock ecu, and hums when car is in standby ignition.
Also If i run it for a while on the stock ecu then switch to megasquirt, it will idle for about 5 second...the fuel pump also doesn't turn on when the battery is plugged in with ms...it used to. When I rev it doesn't make a difference to the idle, it must not be getting fuel? Required fuel is still at 13.2 which is how it always was and ran fine.
Also If i run it for a while on the stock ecu then switch to megasquirt, it will idle for about 5 second...the fuel pump also doesn't turn on when the battery is plugged in with ms...it used to. When I rev it doesn't make a difference to the idle, it must not be getting fuel? Required fuel is still at 13.2 which is how it always was and ran fine.
Last edited by Turbonator; 04-07-2013 at 06:35 PM.
#3
I already tried flashing it but I reinstalled the firmware that was previously on there. I tried a different base map.. still doesn't idle. I had wired in a voltage regular for alternator (external)and a wide band o2 but I un wired both of these. The pump used to prime for 2 seconds everytime I attached the battery terminal.
Also there is this red wire comming out of the firewall near the brake booster which is severed. It's possible this was from an alarm system the previous owner installed then removed.
Also there is this red wire comming out of the firewall near the brake booster which is severed. It's possible this was from an alarm system the previous owner installed then removed.
Last edited by Turbonator; 04-08-2013 at 12:37 PM.
#8
I believe the only thing it is lacking is fuel, something happened to one of the circuits or something because ms was buzzing at one time when I connected the battery cables, but stopped when I turned the ignition key. This was when it stopped working. I believe this was after I messed with the idle control settings.
#9
I have some voltages I took
cpu pin 14 to r33 4.9v
50 pin...pin 22 to car ground= 2.5v
pin 22 to car ground=always 2.3v after battery terminal connected
cpu 14 to U8 pin 2=4.9v for about 2 seconds then drops to 2.5v
cpu 14 to car ground=always 4.9v
Shouldn't pin 22's increase while the fuel pump should be running?
cpu pin 14 to r33 4.9v
50 pin...pin 22 to car ground= 2.5v
pin 22 to car ground=always 2.3v after battery terminal connected
cpu 14 to U8 pin 2=4.9v for about 2 seconds then drops to 2.5v
cpu 14 to car ground=always 4.9v
Shouldn't pin 22's increase while the fuel pump should be running?
#11
Il take em out and test em but I think they do because everytime I go to start it will run for a few seconds or atleast cough after running with the stock ecu. It runs very normally during this period, then stalls. Pretty convinced it's a fuel pump circuit. Anything else I can test? I'd like to order the part and fix this asap. Remember there was a electrical buzzing sound, any specific component that could have been?
#15
Ok, well I tried the fuel pump test mode and the pump didn't turn on. So afterwords I just started it for the heck of it, the map sensor not even connected. And it idled...at 500rpms pretty nicely until Hit the throttle and it immediately died. So I hooked up the map sensor and It wouldn't start. Disconnected map again and it ran..adjusted the idle screw and brought it up 1k rpms. If I hit the throttle it lags but doesn't die, but will died in 2 seconds if I plug the map in, map should be calibrated.
In the log I just let it idle and poke the throttle a few times, and in the end I connect the map sensor.
Fuel pump doesn't prime still, I'm guessing U8 is damaged, as I get 0v before I started it and when im running it at it's output (pin 22). Was told it should be 12v when pumps not running, and 0v when it is.
EDIT: U8 doesn't seem to get any voltage on any pin whether it's running or immediately after battery is connected. Cpu pin 14 mostly 5v, sometimes it goes in between 3.75-4.25, then goes back to 5.
In the log I just let it idle and poke the throttle a few times, and in the end I connect the map sensor.
Fuel pump doesn't prime still, I'm guessing U8 is damaged, as I get 0v before I started it and when im running it at it's output (pin 22). Was told it should be 12v when pumps not running, and 0v when it is.
EDIT: U8 doesn't seem to get any voltage on any pin whether it's running or immediately after battery is connected. Cpu pin 14 mostly 5v, sometimes it goes in between 3.75-4.25, then goes back to 5.