14Cux bench test

[FFMan]

As you may have seen in other posts I am developing an 14cux interface with a Bluetooth android display.

I have my bench 14cux powered and some resistors to give sensible signals to the temp, fuel and tps inputs so no faults are flagged.

I am trying now to get it to think the engine is running by feeding an rpm signal but so far no joy. I am using rovergauge to verify ecu readings to ensure a bug in my code is not incorrectly reporting rpm but so far I can't get any rpm readings. I am feeding a pulsed 12v from a transistor driven by a pic but what I see is that the input to the ecu drags the voltage to zero - maybe my transistor output does not provide enough current. after all, in the car, the coil switch side will be strong. maybe this is the problem, or maybe the ecu needs some other input before it thinks the engine can run. so far I have no maf or lamda signals, but I wouldn't have thought that would prevent running.

from previous development of a shift light I do have motor driven dizzy and coil setup in the garage I could recommission but I wondered if anyone had any thoughts.

thanks

[FFMan]

the communications is running just fine.

After I put up the original post, I did put a meter on the fuel relay output and noticed no output on there. I tried 2 ecus and forcing the pump to run via rovergauge but could get no output, nor does it prime. suggests something else amiss in the wiring though half an hour checking it revealed no obvious issue.

[FFMan]

thanks - I did wonder about this as the input s neutralising any signal I currently give it. i'll dig out my bench dizzy, coil and variable speed motor. nothing like the ticking of a spark plug in the house !

any idea why the fuel pump relay doesn't fire on power up or force on using rovergauge. I have tested for both a 12v and gnd switched output but do not see any change at any time.

[FFMan]

ok that's interesting.

I have only a couple of bugs left so will continue to test in the car. if I can't nail them i'll progress the bench ecu to get it running. I'm not keen on keep starting/stopping the Griff but its getting close to complete now.

[FFMan]

thanks - i'll check pin 19 when I get home.

if that gets the pump priming i'll fire up my bench dizzy or find a cheap function generator with a reasonable output.

[FFMan]

I wonder if pin 34 needs setting to manual gearbox now I look. I think when I plug rovergauge in it says something like auto/drive.

I have a feeling pin 19 is already a positive feed into the ecu but when home Thursday I can check.

is gearbox mode a possible too ?