ECU Schematic - ZR-1 Net Registry Forums

Subfixer · 12-17-2019

Does anyone have a complete schematic for the ECU?

Trying to nail down an electronic issue.

Thanks

Subfixer · 12-23-2019

Since there hasn't been any response, I'll guess no one has an ECU schematic.

geezer · 12-23-2019

What is the " electronic issue" you are chasing?

Subfixer · 12-24-2019

Intermittent code 42. I've replaced everything in that circuit, but the problem continues.

-=Jeff=- · 12-24-2019

Did you see this?

http://zr1.net/forum/showthread.php?t=17291

Might help

Karl · 12-24-2019

Did you recently pull the plenum?

http://www.zr1.net/forum/showthread.php?t=31249

I thought the ecm wiring is located in the shop manual.

-=Jeff=- · 12-24-2019

Wiring yes, I assumed he wanted an internal schematic for the ECM..

Ccmano · 12-25-2019

Quote:

Originally Posted by -=Jeff=-

Did you see this?

http://zr1.net/forum/showthread.php?t=17291

Might help

I posted that thread. With the code 42 being intermittent there is a possibility that a DIS pin may not be totally bent but rather misaligned enough to miss going through the center of its respective connector and pass between the connector and the connector housing. The other possibility is a pin connector that has been enlarged, so that the pin goes through it but the electrical connection between them is not good. The OP may want to check the main DIS connector for these issues. I seem to recall someone on the forum had the latter condition with a similar intermittent problem. The code that is generated will depend on which pin is affected.
H

Subfixer · 12-25-2019

Plenum pull will be the next step.
This problem first showed up sometime after my last plenum pull just before Carlisle.
Code 42 started showing up a month after the Carlisle trip.
Sometimes to won't set for a few days. Other times it sets several times a day. No real pattern.
All cables checked, knock sensor and O2's replaced.
Code shows with both stock chip and Mark's chip.
Last things left are DIS module (I have a spare) or ECU (no spare - reason for needing internal schematic).

12-17-2019	#1
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 396	ECU Schematic Does anyone have a complete schematic for the ECU? Trying to nail down an electronic issue. Thanks __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2021 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige

12-23-2019	#2
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 396	Re: ECU Schematic Since there hasn't been any response, I'll guess no one has an ECU schematic. __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2021 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige

12-23-2019	#3
geezer Join Date: Aug 2010 Location: ottawa canada Posts: 154	Re: ECU Schematic What is the " electronic issue" you are chasing?

12-24-2019	#4
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 396	Re: ECU Schematic Intermittent code 42. I've replaced everything in that circuit, but the problem continues. __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2021 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige

12-24-2019	#5
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,157	Re: ECU Schematic Did you see this? http://zr1.net/forum/showthread.php?t=17291 Might help __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

12-24-2019	#6
Karl Join Date: May 2013 Location: Chicago Posts: 982	Re: ECU Schematic Did you recently pull the plenum? http://www.zr1.net/forum/showthread.php?t=31249 I thought the ecm wiring is located in the shop manual.

12-24-2019	#7
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,157	Re: ECU Schematic Wiring yes, I assumed he wanted an internal schematic for the ECM.. __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

12-25-2019	#9
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 396	Re: ECU Schematic Plenum pull will be the next step. This problem first showed up sometime after my last plenum pull just before Carlisle. Code 42 started showing up a month after the Carlisle trip. Sometimes to won't set for a few days. Other times it sets several times a day. No real pattern. All cables checked, knock sensor and O2's replaced. Code shows with both stock chip and Mark's chip. Last things left are DIS module (I have a spare) or ECU (no spare - reason for needing internal schematic). __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2021 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige Last edited by Subfixer; 12-25-2019 at 10:50 AM.