Throttle Body cleaning/adaptation
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Throttle Body cleaning/adaptation
I've had my 2001 225Q TT for about a year now and this forum has been a great help. Yes, I'm getting my timing belt done this summer (64K miles). I was thinking about cleaning the throttle body today just for fun - car is running great. However, I'm unsure as to whether I need a Vag-com to reset/align when I'm done. Can I just do the TB reset by turning over the key with the door open w/o starting the car? I'd rather not disconnect the battery as I'm not positive I have the radio code - there is 4 digit # in the spare tire area, but I'd rather not test it yet. I've searched, but haven't found a clear answer on this one.
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Bentley sez... >>
The Bentley says that while the car may do an adaptation whenever the key is turned on for at least 10 seconds without the engine running, it will only do so when certain conditions are met. Therefore, unless you use a Vag-com, you'll never know for sure if the TB has adapted. These conditions include: (1) no stored DTCs; (2) the throttle body has stored a voltage drop, which has scrambled it's memory of the appropriate voltages in the DBW throttle system; and (3) the coolant temp between 10~95C.
If you disconnect and remove the throttle body, the Bentley says you must do the adaptation procedure. Maybe this will be the voltage scrambling that's necessary. I don't know. But by disconnecting the battery, you can at least be sure one of the conditions has been met. If you've got a stored DTC that doesn't activate the check engine light, then according to the Bentley, no adaptation... and you might not know. It happens fast, like in less than 10 sec. according to my ProDiag...
I did mine yesterday with a ProDiag (handheld competitor to Vag-com running on a Palm) and my car's throttle response is smoother, especially at lighter throttle pressure.
~john
If you disconnect and remove the throttle body, the Bentley says you must do the adaptation procedure. Maybe this will be the voltage scrambling that's necessary. I don't know. But by disconnecting the battery, you can at least be sure one of the conditions has been met. If you've got a stored DTC that doesn't activate the check engine light, then according to the Bentley, no adaptation... and you might not know. It happens fast, like in less than 10 sec. according to my ProDiag...
I did mine yesterday with a ProDiag (handheld competitor to Vag-com running on a Palm) and my car's throttle response is smoother, especially at lighter throttle pressure.
~john
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