Trigger problem page for MembersPage/EricN/Trigger
Problem Description
At any rpm, (tested up to 4000), I loose ignition, fuel pump and fuel injector activity for a very brief split second. Feels like I have shut the board off and on again super fast. Megatune log shows rpm drop to 0 during most of the events but not all seem to get recorded. Megatune shows no resets. With the board out of the truck and on the test bench, fault is the same. For the rest of this page, assume the readings and observations are all off the test bench with nothing but the fuel pump relay and input trigger connected. There are no ign coils, no injectors, no wb02, no idle solenoid, no sensors, nothing is hooked up.
Things I know are not at fault
- Ground- I have 2 gnd wires and 4 gnd5 wires. Only load is the fuel pump relay, NOTHING ELSE is connected.
- Firmware version- I have tried every firmware version released since 1.0.12, problem has been no different.
- Power supply- Problem happens the same in the truck with 14v, just using a car battery reading 12.4v, or a computer power supply reading 11.6v.
- Input trigger runout- Originally used a [VR sensor] and set the board up for that. No suggestions would help. I have now changed over to Hall type and am using an optical trigger (will detail that later) problem is the same. Used pc signal generator, problem no different.
- Communication cable or Lcd cable failures/faults- problem happens with them connected or not.
My best guess
- Config related- I want to wipe the config completely clean and start from scratch. I know how to make (make mtt) and upload a config using the Terminal Program but cant figure out how to make an empty one so I can just enter the variables I need 1 by 1 and test as I go.
- A short somewhere on the board- I measured every pin on the processor while the board was being triggered and looked for change when the event happened and recorded the pins that showed change.Used a graphing multimeter set on 14v, black lead to gnd.
- pin11 2.5v normally, starts spiking a bit to 5v, drops to 0 for a split second when I hear relay click.
- pin23 Looks like a really noisy signal, very rough, didnt record the voltage but it was close to 0v if not at 0v. Didnt reall show any change when event occured.
- pin33 2.39v always, drops to 0v when relay clicks.
- pin47 always 0, spikes at 4.97 or 2.5v when relay clicks.
- pin55 rough line, varies from 1.2-1.6v normally, spikes to 4.5-5v when fuel relay cuts out.