got some codes today, rough idle

**im-audi** · 05-20-2014 09:01 PM

I recently did a Timing belt kit on my car. drove it for about a 100 miles. then this morning when I started it I could hear a light rubbing sound. I new it was coming from the timing belt rubbing against one of the covers based on the speed of the rub. so i took a different vehicle to work and fixed the rubbing when i got home. But during the process i broke the throttle body electrical connector. just the little plastic part that snaps/locks it into place. when i got it all back together i took it for a test drive after about a 10min warm up at idle. 6 houses down, right after shifting into 2nd, the car lost power and stayed at a rough idle. i putted back home in reverse.

i checked it with the vag-com and got these codes -
p1548 (solenoid valve for charge pressure control-N75:open)
P1545 (throttle valve control system : malfunction)
P1568 (throttle valve control module-J338:mechanical malfunction)
P1579 (throttle valve control module-J338: adaptation not started.

so i tried to adapt the throttle body and it read ERROR. i cleared the codes and started it again. same rough idle. shut the car off and checked to codes again. the only ones that stayed were
P1568 and P1579.
i tried to do the adapt again and got the error again.
I also unplugged the connector, disconnected the battery, pluged the connector back in, and re connected the battery. no difference.
did i blow the throttle body? is there a fuse/relay to check before replacing the throttle body? im stuck.

**S4James** · 05-21-2014 03:39 AM

First thing is to check the measuring blocks, see if the ECU is even reading the inputs.

Double check that connector.

open the throttle plate by hand, let it shut. Operation should be smooth with the slight feeling of the large toothed gear inside the unit translating into your finger. It should return closed on its own.

you are feeling for anything off, through its range of motion. Something indicating anything mechanical..

You can also pin test the wiring, might have broken a wire or something.

**im-audi** · 05-21-2014 06:03 AM

Originally Posted by S4James

First thing is to check the measuring blocks, see if the ECU is even reading the inputs.

Double check that connector.

open the throttle plate by hand, let it shut. Operation should be smooth with the slight feeling of the large toothed gear inside the unit translating into your finger. It should return closed on its own.

you are feeling for anything off, through its range of motion. Something indicating anything mechanical..

You can also pin test the wiring, might have broken a wire or something.

Ok I will try all that later today. Which wires are supposed to to hot? Can I ohms test the throttle body? if so what reading am i looking for?