FIS Posted August 10, 2021 Report Share Posted August 10, 2021 I have problem with AC request (set on DI 3) of Subaru PnP board. When pushed On it works normally but when you push to OFF it wont get OFF. Using extension cable I changed AC request to DI7 but has same problem. In the next day I test again, first time push ON and OFF was okay after that it failed all the time. I tried to replace Subaru HVAC controller still get same problem Just curious to try use AN 6 as AC request and set AC clutch output as GP output, it works but not as good as factory setting Please help Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 10, 2021 Report Share Posted August 10, 2021 Whats the voltage on the DI pin with the AC switch on and off? Quote Link to comment Share on other sites More sharing options...
FIS Posted August 10, 2021 Author Report Share Posted August 10, 2021 I measure just now, it works at first time ON 12.5V OFF 0.7-0.8V then failed ON 1.15 -1.28V OFF 1.15 - 1.28V no difference Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 10, 2021 Report Share Posted August 10, 2021 It needs to drop below 1.0V to turn off. You could try adding a common diode such as a 1N4001 inline which will reduce the voltage by about a further 0.6V which should get it below the threshold. Quote Link to comment Share on other sites More sharing options...
FIS Posted August 10, 2021 Author Report Share Posted August 10, 2021 Okay will try Thank you Quote Link to comment Share on other sites More sharing options...
FIS Posted August 11, 2021 Author Report Share Posted August 11, 2021 I add diode . With engine idle AC switch off the voltage 0.8V not stable but slowly up. In about 2 minutes it become 1.2V but AC still inactive. I switched AC on voltage goes to 1.3V, AC active. When AC switched off voltage remain 1.3V AC won't get off Quote Link to comment Share on other sites More sharing options...
Simon Posted August 11, 2021 Report Share Posted August 11, 2021 The change in voltage level between on and off is not what would be expected. The voltages you mentioned when it worked are more what we would expect. 12Vish to 0ish It could be there is an issue with the gas levels or the pressure switch. But it is an issue outside of ECU settings. Quote Link to comment Share on other sites More sharing options...
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