2005 Volvo XC90 Misfire/stall after cleaning ETM

My friend has a 2005 Volvo xc90 2.5t. Yesterday he attempted to clean his Electronic Throttle Module and now the engine is misfiring, backfiring and then stalls. The check engine light flashes when first starting the vehicle. I connected my diagnostics scan tool but, it said “no codes”. I assume only Volvo will be able to diagnose the issue at this point. The whole purpose of him cleaning the ETM was because it was surging at idle with the AC running. I am pretty good with cars and I stopped over to look at it and cannot see any issues. The ETM is buzzing when the key is in the ON position but when you press the gas pedal it stops bussing and you can hear the throttle plate opening and closing. It seems to be a multiple cylinder misfire. We disconnected the battery and then after reconnecting the battery put the key in the on position for 15 minutes because we read it would help with the calibration or relearn of the throttle. My buddy did admit to moving the throttle plate when cleaning it, but there are videos online of other people moving it while cleaning it and didn’t have any of these issues after. I personally think it’s a bat Electronic Throttle Module now since that is the only think that was tampered with. I also checked all the connections and vacuum lines and didn’t see any issues. I wish I had an expensive diag tool to read Volvo codes.