Feeding WB signal through ZR-1 3993 ECM
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Supreme Member
Joined: Dec 2001
Posts: 1,997
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From: Bartlett, IL
Car: 92 ZR-1
Engine: LT-5
Transmission: ZF-6
Axle/Gears: SuperDana 44 4.10
Feeding WB signal through ZR-1 3993 ECM
Todd,
Todd,
Did you feed any WB O2 signal through the ECM? And if you did, which pin did you use and what did you change in the ALDL stream?
Todd,
Did you feed any WB O2 signal through the ECM? And if you did, which pin did you use and what did you change in the ALDL stream?
Junior Member
Joined: Jul 2002
Posts: 20
Likes: 0
Re: Feeding WB signal through ZR-1 3993 ECM
Dominic,
I did feed a dual channel wideband signal to the ECM. Not so much for datalogging, but to run Closed Loop lambda control. For datalogging, I preferred the separate wideband software, and logged MAP, TPS, and RPM at the same time. Most wideband logging can be quite a bit faster than the serial OBD stream.
Depends on what your objective is, but there are a few unused inputs on the ZR-1 ecm. C1 is the 0-5v EGR signal on 93-95 cars. B15 is open, and works as well. In either case, you'll have to determine the appropriate a/d channel, and write a separate read routine in the code, as neither of these pins are read in the 92 program.
I took it all the way to functioning closed loop control, but I suspect that might be more than you are asking. It can be done, but took several weeks of work to get it right.
Hope this helps.
Todd
I did feed a dual channel wideband signal to the ECM. Not so much for datalogging, but to run Closed Loop lambda control. For datalogging, I preferred the separate wideband software, and logged MAP, TPS, and RPM at the same time. Most wideband logging can be quite a bit faster than the serial OBD stream.
Depends on what your objective is, but there are a few unused inputs on the ZR-1 ecm. C1 is the 0-5v EGR signal on 93-95 cars. B15 is open, and works as well. In either case, you'll have to determine the appropriate a/d channel, and write a separate read routine in the code, as neither of these pins are read in the 92 program.
I took it all the way to functioning closed loop control, but I suspect that might be more than you are asking. It can be done, but took several weeks of work to get it right.
Hope this helps.
Todd
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