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Fault codes

ToreB said:
You have indeed a faulty fresh air servo.
This is fairly easy to change, and is done in 5-10 minutes. Remove electric connector, slightly lift the catch flap to pull out. Remove the three fastening screws. Use a small screwdriver or punch to press the main metal output shaft down and out of the servo housing. Remove servo, and use a flat screwdriver to unclip the metal flap rod from the servo arm fastener.

When installing a new servo, do NOT manually rotate the servo arm. First, connect it to the car harness, turn on the ignition and set to minimum temperature on the CCU. The servo arm then rotates to a position where it is possible to reinsert to the metal frame underneath. When the servo is in place and fastened, turn off the ignition to make the servo arm rotate to the forward pointing position. It is a bit fiddly to clip on the flap rod to the servo arm, but I use a L-shaped tool to pull it up into the lock clip. Be sure to rotate the plastic clip so the recess accepts the metal rod.

I always read out all CCU fault codes first, note, and clear them. Disconnect the tool, and use all HVAC knobs for a while, then read out codes again. Any reappearing codes point to a faulty servo or fan.

The Scantool software is not very good at enabling the Drive Link and Actual values (actuator maneuvering and sensor readings) in the Climate Control Unit.
The functions also depends on the control unit version, there is about 4 versions used in the 964 and 993 series. The software developer did not implement a good interface to control or monitor this.

There are no hidden functions in Scantool, what you see in the windows is what you get. There is no full user manual.

Cheers,
Tore
:worship: :worship: :worship: :worship: :worship:
 
ToreB said:
You have indeed a faulty fresh air servo.
This is fairly easy to change, and is done in 5-10 minutes. Remove electric connector, slightly lift the catch flap to pull out. Remove the three fastening screws. Use a small screwdriver or punch to press the main metal output shaft down and out of the servo housing. Remove servo, and use a flat screwdriver to unclip the metal flap rod from the servo arm fastener.

When installing a new servo, do NOT manually rotate the servo arm. First, connect it to the car harness, turn on the ignition and set to minimum temperature on the CCU. The servo arm then rotates to a position where it is possible to reinsert to the metal frame underneath. When the servo is in place and fastened, turn off the ignition to make the servo arm rotate to the forward pointing position. It is a bit fiddly to clip on the flap rod to the servo arm, but I use a L-shaped tool to pull it up into the lock clip. Be sure to rotate the plastic clip so the recess accepts the metal rod.

Cheers Tore!
As usual - your help on anything CCU related is always superb. I'm really not sure how a lot of us would get on without you being around on this forum :thumbs:
 

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