Rich52 Posted March 16, 2023 Report Share Posted March 16, 2023 Is there a list of output pull up configurations for an EVO 7 G4X plug in ECU? I see some with open collector, some pull ups and some with fly back diodes buts it not clear which is which. I'm currently trying to use Ign5 to drive to 12V but that is only showing 5V o/c so looks like an "open collector"? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted March 16, 2023 Report Share Posted March 16, 2023 All outputs drive low. Aux 5-8 can drive high on some ECUs but only as a switched output, from memory the EVO 7 is not one of these ECUs. Aux 9&10 can theoretically drive high as they are used for E-Throttle but they aren't setup to use this functionality outside of E-Throttle. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 16, 2023 Report Share Posted March 16, 2023 Further, Aux 1-10 are pulled up to regulated 12V by 1.5Kohm. Aux 1-10 are flywheeled. Ignition and injector drives are effectively open collector, not flywheeled. The ign drives do actually have a very weak 6V pull-up effect coming from the fault checking circuit as you have found, this is often enough to drive very low current signals like SSR's etc without adding an external pull-up. The RX7 plug-ins dont have the high side drive chip on Aux 5-8, low side only. Quote Link to comment Share on other sites More sharing options...
Rich52 Posted March 17, 2023 Author Report Share Posted March 17, 2023 Perfect Adam - many thanks Rich Quote Link to comment Share on other sites More sharing options...
Rich52 Posted March 17, 2023 Author Report Share Posted March 17, 2023 Follow up - I persevered with the Ign5 (Aux) output to drive an SSR and as you said it has a weak pull up - found it was able to drive about 125 microamps to 5.5V. I changed my MOSFET SSR input to a 56kohm to ground and it now looks good. Added a 10nF capacitor as noise suppression for good measure . I'm running a 10Hz PWM output. Thanks again. Quote Link to comment Share on other sites More sharing options...
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