Help! buzz in pwr/train relay

[cdover2005]

No luck on that ground, I called it quits for the day. Considering sending the ecm to zzp and having it tested, or buying a new one

 

[Gtstorey]

Next step will be to disconnect connector x2 from the ECM and see if you lose the voltage at pine 30 of the per/train relay.

 

[cdover2005]

Next step will be to disconnect connector x2 from the ECM and see if you lose the voltage at pine 30 of the per/train relay.

Still has voltage with either or both plugs disconnected from the ecu. Buzzing stops with the crank relay out

 

[Gtstorey]

So it isn’t likely it’s the ecu. Something must be shorting in between.

 

[cdover2005]

so I was wrong, When the 58 pin ecu connector is disconnected the voltage goes away. Also, when it is plugged in, there is 7 volts on the case. I discovered this by accident when the case touched a brake line and arced.

 

[Gtstorey]

So the ECM metal case has voltage to ground of 7v? I guess that would indicate that ECM has severe problems but at this point I'm just guessing. No other bare wires touching the case?

 

[07GXPVille]

Resurrecting a dead thread here I know but I’m having this exact same issue with the LNF in my solstice GXP. Any resolution on this? I’ve checked grounds, checked all fuses and relays, reseated my ECM and checked the connectors, can’t see any bare wires.

Really hoping someone that helped with this/fixed this is still around. Thanks so much for any help.