I have a 2000 Blazar that has a current draw problem,when the ignition is off.I traced it down to the throttle body control circuit.I disconnected the sensor and it still draws current.Could it be one of those type circuits that should be asleep when the ignition is off? Any ideas out there?.

 

How much current are we talking about? Where are you measuring it?

George

 

1and 1half amps between the battery and the disconnected positive hookup terminal

 

I will assume then that you have 1.5A of current flowing from your battery positive terminal with the ignition off. Is that correct?

Do you believe that the idle air control valve or the TPS sensor is the cause? How do you know this? Which one are you unplugging?

George

 

Yes I got an amp an one half draw between the battery and the disconnected positive hookup terminal.The battery will run down overnight(when hooked up) unless i pull the throttle body control fuse.
I disconnected all the connections around the throttle body and it still drew that much current But without the fuse plugged in,the current draw was only 8 millamps

 

The two electrical components at the throttle body are the TPS sensor and the idle air control valve. Both of them get their power directly from the VCM. I don't see a dedicated throttle body fuse in the wiring diagrams. Is the fuse that you are pulling to kill the phantom power in the underhood fuse block or the I/P fuse block? What is its value? What is it called exactly on the fuse cover label?

Are you drawing this 1.5A even with the ignition off?

George

 

It is a 10 amp fuse labeled TBC on the fuse reference sheet,inside the fuse cover under the hood

 

If you mean the TBC fuse just above the crank fuse, that Truck Body Computer. Is this the one?




George

 

Yep that's it

 

Oh and that's Trunk Body Computer instead of Throttle Body Control.Can I reset this thing? I'm glad you clarified that.