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AC Clutch not engaging

Posted: Mon Jul 25, 2022 3:21 pm
by topsimportgarage
Hello, the AC clutch is not engaging when AC is turned on. I diagnosed it to the some sort of setting conflict in the S300v3. Here's what happens:
All of the wiring and has been confirmed functioning. I am able manually activate the AC clutch using the SManager in "Test Output" and by disabling the Nitrous Control/Aux1. With the current tune (attached), turning on the AC will not engage the clutch. AC pressure switch is temporary bypassed for testing. I was able to get the AC clutch to activate by changing the following setting: Parameter->Nitrous/AUX1->Function->Nitrous Control->DISABLE. However, the engine boogs at 2,000 RPM with the Nitrous control DISABLED. I've also verified the AC switch does toggle on/off in the Smanager "Sensors". I'm not to sure what to do from here to troubleshoot further. I've attached the calibration and datalog file. Any suggestions or guidance would be greatly appreciated

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 3:29 pm
by Spunkster
Have you tried the ECU on a known working vehicle that has AC working?

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 3:50 pm
by topsimportgarage
The AC will work with this ECU if if the Nitrous function is disabled. However the engine will boog down at 2K RPM with the Nitrous function enabled. This car is an all motor vehicle with no nitrous or force induction.

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 4:13 pm
by Spunkster
Then why do you have the nitrous functions enabled?

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 4:28 pm
by topsimportgarage
I didnt tune it. It was tuned by someone else. AC was added after the fact. I only notice AC would work with Nitrous disable. Ive tried to contact thr person that setup the S300 and theyre not responding

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 4:31 pm
by Spunkster
You need to disable the nitrous controls

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 4:34 pm
by topsimportgarage
Well yes, I understand that. When I disbable the nitrous control, the engine wont rev past 2K rpm

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 4:41 pm
by Spunkster
The datalog you have provided does not show when this is happening.

Re: AC Clutch not engaging

Posted: Mon Jul 25, 2022 6:10 pm
by topsimportgarage
I will get the datalogs tomorrow

Re: AC Clutch not engaging

Posted: Tue Jul 26, 2022 8:20 pm
by topsimportgarage
I was able to resolve the issue by doing the following

Ignition in Accessory position (engine off)
Link to S300v3
Go to Nitrous/Aux 1, Function "Nitrous control", Input and change the Arming input setting to "disable", the change Function to "Disable"
Upload to S300v3
Turn ignition off, wait 10sec then start engine

The AC Clutch now works and there no more issue with revving past 2K RPM

I appreciate all the help you provided in helping me troubleshoot this issue