ECM Issues - No Start - ZR-1 Net Registry Forums

Macroblock · 06-19-2020

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)

06-19-2020	#10
Macroblock Join Date: May 2020 Location: Windsor Posts: 39	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) Last edited by Macroblock; 07-01-2020 at 02:42 AM.