PAezb Posted July 18, 2007 Share Posted July 18, 2007 Ok, this is on a 96 OBW 2.5EJ with auto tranny. Notice the other night, with the engine off, but in gear, and the with ignition key to accessory (instrumentation gauges lit) a strange buzzing sound coming from underneath the car, somewhere around the tranny. At first I thought it may be coming from one of the O2 sensors, but the buzzing still there when I disconnected them. The buzzing stops if I put the tranny into Park or Neutral, but buzzes in drive, 1st, 2nd, 3rd. C-Selanoid? Fuel Pump? Anyone know what this it, and if it is something I need to look into further? It's probably normal, I just never noticed it before... Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted July 18, 2007 Share Posted July 18, 2007 Nope that's normal. The TCU controls many of the AT's solenoids with a 50Hz square wave of varying duty cycle. I can hear it too with engine off, key on, in gear. Some people say they can hear it with engine on too. Quote Link to comment Share on other sites More sharing options...
PAezb Posted July 18, 2007 Author Share Posted July 18, 2007 Nope that's normal. The TCU controls many of the AT's solenoids with a 50Hz square wave of varying duty cycle. I can hear it too with engine off, key on, in gear. Some people say they can hear it with engine on too. Thanks. I had an inkling that's all it was. Never heard it before on this car, and with it getting up in years and miles, wanted to make sure it wasn't something that was beginning to fail. Quote Link to comment Share on other sites More sharing options...
ericem Posted July 18, 2007 Share Posted July 18, 2007 Anyone notice the fuel pump kicks in when you tap the pedal at like 1/4 throttle? with key at ignition on but engine not started. Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted July 19, 2007 Share Posted July 19, 2007 Hm..really? I'll have to try that out. Maybe we should start a list of subaru tricks. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.