Following on from my previous post starting this idea, next is how to send the pulses to the ECU. The ECU pulls up the signals to 5V so the pulse generator needs an open-collector arrangement. The following diagram is taken from my ECU tester where it works well.
![](https://www.djetronic.org/wp-content/uploads/2024/06/Screenshot-2024-06-16-115918-1024x500.png)
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