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U0107 code no communication with throttle actuator

 
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Just Try It1 Just Try It1
Moderator | Posts: 2796 | Joined: 08/14
Posted: 09/27/18
05:28 PM

without the scan tool being able to not just connect but to Graph the sensors output.. its going to be hard..

i don't know how to disconnect that yet..

i do see that there are actually 4 different throttle bodies available for that engine.

you might want to repost this over at reddit.com/r/mechanicadvice  there are more GM techs there ..

i will look around for info.. need to figure out how to get the scan tool to connect first..  backprobing and measuring voltages at the sensors does not always find the issue..


Circuit Description
The accelerator pedal position (APP) sensor is mounted on the accelerator pedal assembly. The sensor is actually 3 individual APP sensors within 1 housing. Three separate signal, low reference and 5-volt reference circuits connect the APP sensor assembly and the throttle actuator control (TAC) module. Each sensor has a unique functionality. The APP sensor 1 signal increases as the accelerator pedal is depressed, from below 1 volt at 0 percent pedal travel, with the pedal at rest, to above 2 volts at 100 percent pedal travel, with the pedal fully depressed. The APP sensor 2 signal decreases from above 4 volts at 0 percent pedal travel to below 2.9 volts at 100 percent pedal travel. The APP sensor 3 signal decreases from around 3.8 volts at 0 percent pedal travel to below 3.1 volts at 100 percent pedal travel. Notice that the signal circuits for APP sensor 2 and APP sensor 3 pull up to 5 volts and the APP sensor 1 signal circuit is referenced to low reference within the TAC module.

there are a lot of pages of diagnostic trouble shooting charts for the U0107 code..  

Just Try It1 Just Try It1
Moderator | Posts: 2796 | Joined: 08/14
Posted: 09/27/18
06:04 PM

NOT so wild of a guess.

open you hood..

stand beside the drivers side tire looking into the engine compartment..

 can you see where the transmission bell housing meets the back of the engine.  it may have a bunch of stuff in the way..

there are bell housing bolts to connect the transmission to the engine block.. at the 3 o clock position.. second bolt down on the rear side of the bell housing is a Double ended stud/bolt. it will have a tab bolted to it.. with a black block on that tab with a bunch of black wires coming out of it.. that is the G105 or G103 ground connection.   that has 2 wires from the throttle actuator assembly.. yep.. the connector you posted.. pin 8 a black and white wire.. and pin 17 also a black and white stripe wire..

do you have a hand held digital volt meter..  so you can do voltage drop tests without letting the smoke out of the devices..  

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