Potentiometer On Positioning Motor

sinlessUK

sinlessUK

Member
Hi

Any ideas on how to cure this. Keeps coming back after clearing.

Regards

Address 08: Auto HVAC Labels: None
Controller: 8Z0 820 043 F
Component: A2-KLIMAVOLLAUTOMAT 0512
VCID: 3905AEE73041
1 Fault Found:
00601 - Potentiometer On Positioning Motor for Central Flap (G112)
30-10 - Open or Short to Plus - Intermittent
 
Hi,

it sounds like your positioning motor is on the way out. It could be a wiring fault, but the motor unit is the most likely cause. In that case the only solution is to replace it.

The central flap motor (V70) is accessible from the driver's side footwell. The following guide which covers changing the G263 sensor includes removal of the central flap motor as part of the process:

http://www.a2oc.net/forum/showthrea...-temperature-sender-without-removing-the-dash

This guide covers the climate unit in general.

http://www.a2oc.net/forum/showthread.php?25089-Anatomy-of-the-A2-climate-unit

regards

Andrew
 
If there are no noticeable symptoms then you also have the option of leaving well enough alone?

Errors like this are common without any symptoms.

Steve B
 
sinlessUK said:
Cheers guys.

Silly question, what would the noticeable systems be.
Click to expand...

Basically, is the aircon system blowing normally and is the air coming out of the vents you expect?


As I say, if you don't have any symptoms that you are ware of you could consider leaving it alone.

Steve B
 
Birchall said:
Basically, is the aircon system blowing normally and is the air coming out of the vents you expect?


As I say, if you don't have any symptoms that you are ware of you could consider leaving it alone.

Steve B
Click to expand...

I mostly have the Auto+Econ on but everything seems OK. I will try and refrain from tinkering.

Very rarely have it just Auto as it seems to take some of the RPM and I need all I can get.

Cheers
 
Hi Sinless,

I have also had the fault code that you are experiencing, and I can confirm that the method of fixing this as posted in the link above by Spike does work. Cycling through the climate control air direction positions fixed it for me. I would definitely recommend doing this before you disassemble or replace anything.

Regards,

Matt.
 
Hi

"Blocked or no voltage" as in the linked post indicates that when the climate control unit tried to move the flap motor, it did not detect any movement. The motor is not moving because it is "blocked", i.e. stuck or it is not getting any voltage to make it move.

If the motor is stiff then moving it a lot (e.g. by performing the motor calibration) or just cycling between the settings on the controls can help free it, although the motor has a high torque so lubrication would probably be needed as a more permanent solution. Note however that it is the motor that would be stuck and not the flaps themselves as the flaps are inherently very free moving and there is nothing for them to get stuck against.

If you don't see the "blocked or no voltage" error then the control unit doesn't think there is anything wrong with the movement of the motor but the fault listed means that it does think there is a problem with the position sensing potentiometer.

Note that a faulty positioning potentiometer can lead the climate control unit to incorrectly think that the motor is stuck as well. It tries to move the motor and can't detect movement, but that's because it isn't able to detect movement, not that there isn't any movement. That's happened to me which caused the motor to run off the end and disengage the gears completely because the motor was moving when the climate unit didn't think it was so it didn't know it had to stop at the end.

The fault is listed as "intermittent" which means that it works some of the time and not others. I have replaced a few motors which have had vibration affected "intermittent" connection problems inside the motor unit. It mostly works when the car is stationary but fails when the car is traveling on the road, or when you tap it. That means that its likely to be perfectly fine when tested with the car stationary.

When the climate unit detects a problem with a motor, it stops trying to do anything with that motor until reset (by switching off). Thus the motor will stay in the last position. The motor you don't want this to happen with is the temperature control as the cabin with either be cold or very hot all the time depending on where the motor stops last.

The central flap motor doesn't really effect much as it just regulates airflow between the face vents and the feet. At most positions there will be airflow to both places so a stopped motor won't really be that noticeable.

The motor is probably faulty, some of the time, but you probably won't notice very much difference.

regards

Andrew
 
Nice one guys some interesting reading to be done.

I'll perform what wilco184 says as this is the easiest to start with.

Could someone just confirm the following procedure is correct for resetting the "Climate Control Unit"

Connect the VAG-COM, go to the control modules, and "08 Auto HVAC".
Erase Fault memory
Engine still idling after erasing faults
Air Con set to Auto
Advanced functions, basic settings.
Group number 1. (Press "up" once)
As the numbers change, the position of the flaps change.
Wait till all those are 0.0.0.0
 
sinlessUK said:
Nice one guys some interesting reading to be done.

I'll perform what wilco184 says as this is the easiest to start with.

Could someone just confirm the following procedure is correct for resetting the "Climate Control Unit"

Connect the VAG-COM, go to the control modules, and "08 Auto HVAC".
Erase Fault memory
Engine still idling after erasing faults
Air Con set to Auto
Advanced functions, basic settings.
Group number 1. (Press "up" once)
As the numbers change, the position of the flaps change.
Wait till all those are 0.0.0.0
Click to expand...

Anyone confirm?
 
Going by memory that sounds familiar.

A quick "Google" of the Ross Tech site should confirm the actions.
If I get chance I will have a look shortly.

Steve B
 
The Google search produced one seemingly relevant link (but for a different Audi model)

It indicated the following

Controller 08 - Auto HVAC
Basic Settings - 04
Group 001
Go!

There are about 10 values that come up but around 6 of them go through a cycle. You can hear them all moving to the upper range and find their limits and then they all move to the lower range and then they all reset back to 0. This takes about 60 seconds.

The aircon stops while it's doing this and starts up again once completed. I went back into the Fault codes and it now shows No faults.


steve B
 
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