Re: ECM Issues - No Start
 

Problem solved:

ECM component failure U13 has been resolved by installing a general-purpose MCU, namely "Arduino" (a.k.a. an Atmega 328).

The hardware provides 7 outputs to the individual GATEs of transistors Q2 thru Q8. The DIS Crank Reference HI and the GATE from Q1 form the inputs.

The firmware monitors the RPM from Crank Ref. Hi and the injection pulse width from Q1. It then sends the same pulse to Q2-Q8 below 500 RPM. Above 500 RPM the Q2-and Q8 pulses remain the same but are slightly delayed (using some funky math) to permit optimum sequential injection.

https://www.youtube.com/watch?v=w9EcESdYibE

peter@zr1ecm.com (thought this would make a cool email address)

Re: ECM Issues - No Start
 

:notworthy

Re: ECM Issues - No Start
 

You know... someone could make a small business out of repairing these. Just sayin...
H
:cheers:

Re: ECM Issues - No Start
 

Great job.

Anything can be built or fixed, the impossible just takes alittle bit longer.

Re: ECM Issues - No Start
 

Impressive diagnostic logic and repair!

Sent from my SM-G950U using ZR-1 Net Registry mobile app

Re: ECM Issues - No Start
 

So I suppose the next question becomes, is this what goes out on most of them or are there a multitude of electronics within the ECU that potentially fail?
H
:cheers:

Re: ECM Issues - No Start
 

Hi Hans,

My ECM service has processed 35 ECM's so far. About 50% were repaired by fixing broken solder connections. About 30% were repaired with a fresh microcode download. 20% could not be repaired. Generally if there is a damaged component the unit can't be repaired.

Re: ECM Issues - No Start
 

Macro,

Of course the secondaries are driven off the primary injector and powered by the secondary relays. How did u check to see if the secondary injectors were pulsing?
Or did ur procedure pulse the injector pairs?

Re: ECM Issues - No Start
 

I also say
:cheers:
and
:notworthy:

to Macroblock!

I'm impressed!
Do you have any photos of the surgery
you did inside the ECM?

Re: ECM Issues - No Start
 

More questions.. will the Arduino hold to the heat? I assume you wrote the code for the arduino?