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06-19-2020
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#11 |
Join Date: May 2020
Location: Windsor
Posts: 38
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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 01:42 AM. |
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06-19-2020
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#12 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,376
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Re: ECM Issues - No Start
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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06-19-2020
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#13 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: ECM Issues - No Start
You know... someone could make a small business out of repairing these. Just sayin...
H 
__________________
90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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06-19-2020
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#14 |
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Join Date: Mar 2007
Location: Sweden
Posts: 28
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Re: ECM Issues - No Start
Great job.
Anything can be built or fixed, the impossible just takes alittle bit longer. |
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06-20-2020
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#15 |
 Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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Re: ECM Issues - No Start
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06-20-2020
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#16 |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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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
__________________
90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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06-22-2020
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#17 |
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Join Date: May 2007
Location: Addison IL
Posts: 240
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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. |
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06-22-2020
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#18 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,669
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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?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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06-22-2020
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#19 |
 
Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,445
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Re: ECM Issues - No Start
I also say
and :to Macroblock! I'm impressed! Do you have any photos of the surgery you did inside the ECM?
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1995 ZR-1 #106 Blk/ Blk Owned by me since 2000. 91K miles, but not on motor :-) Mods the way I want it, Not afraid to drive it! |
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06-22-2020
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#20 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,136
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Re: ECM Issues - No Start
More questions.. will the Arduino hold to the heat? I assume you wrote the code for the arduino?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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Linear Mode
