Schematics for 1227165 (1227808 with additional IC U2)
Posted: Mon Oct 05, 2020 11:47 pm
- Sheet 1 - Processor
- Sheet 2 - Inputs
- Sheet 3 - Outputs
- Sheet 4 - Ignition and Injectors
- Sheet 5 - Connectors
- Sheet 6 - Power Supply
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Schematics for 1227165 (1227808 with additional IC U2)
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Re: Schematics for 1227165 (1227808 with additional IC U2)
Posted: Tue Oct 06, 2020 11:53 pm
Thanks for that. I'll make it a sticky.
For anyone looking for simiar content for other ECMs around the same era there is also a mirror of the original source (Ludis' site) with schematics and other content which we have mirrored here https://pcmhacking.net/ludis/
For anyone looking for simiar content for other ECMs around the same era there is also a mirror of the original source (Ludis' site) with schematics and other content which we have mirrored here https://pcmhacking.net/ludis/
Re: Schematics for 1227165 (1227808 with additional IC U2)
Posted: Wed Oct 07, 2020 6:08 am
Awesome. I know you've also got the memcal page mirrored here. What else is mirrored here, or is that it?
Re: Schematics for 1227165 (1227808 with additional IC U2)
Posted: Wed Oct 07, 2020 8:07 am
https://pcmhacking.net/memcals.html
Thats the only two. They both seemed like great information we couldnt afford to loose.
Thats the only two. They both seemed like great information we couldnt afford to loose.
Re: Schematics for 1227165 (1227808 with additional IC U2)
Posted: Tue Dec 08, 2020 2:14 pm
Re: Schematics for 1227165 (1227808 with additional IC U2)
Posted: Wed Jun 22, 2022 7:26 pm
For those of you who can't get simulated narrowband O2 signal from a wideband lambda controller to work with these (and later) ECMs:
If you look at the inputs schematic and take note of the O2 sensor amplifier, you will note that it has two inputs pins.
O2HI - obvious, the narrowband signal comes in here.
O2LO - perhaps less obvious, it needs to connect directly to the signal ground PIN on the wideband controller.
Ideally you would splice the wideband controller signal ground wire (goes to engine block ) and O2LO wire (to ECM) as close as possible to the wideband controller, ideally in the connector.
If you look at the inputs schematic and take note of the O2 sensor amplifier, you will note that it has two inputs pins.
O2HI - obvious, the narrowband signal comes in here.
O2LO - perhaps less obvious, it needs to connect directly to the signal ground PIN on the wideband controller.
Ideally you would splice the wideband controller signal ground wire (goes to engine block ) and O2LO wire (to ECM) as close as possible to the wideband controller, ideally in the connector.