activating cooling fans

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victor35ma

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Hello again, in this car... we replaced the cooling fans and now cooling system is running fine no issues. but, after replacements you now I am trying to use VCDS as much as possible so I can be trained by myself in planet VCDS.. so, I tried output test 08 Hvac /03 output... 1 out 2 cooling fan runs for a few seconds only fan for HVAC start up. every other component runs just fine. my question: are they supported (both the fans). why both fans didn't come on? is it something in VCDS or is just not supported. thanks again, and please focus only in my question. the car is fine now.

03 AUDI TT 1.8L


Code: 
Tuesday,23,June,2015,14:15:59:33623
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 14.10.2.0 (x64)
Data version: 20150311
www.Ross-Tech.com


VIN: TRUTC28N231007939   License Plate: JSFUNCR
Mileage: 51717   Repair Order: 03AUDI TT1.8 AWP


Chassis Type: 8N (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: TRUTC28N231007939   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-AWP.lbl
   Part No: 8N0 906 018 BD
   Component: 1.8L R4/5VT     G   0003  
   Coding: 07570
   Shop #: WSC 01236  
   VCID: 74E7E067443878817A7-515E
   TRUTC28N231007939     AUZ5Z0B9145163

2 Faults Found:
17978 - Engine Start Blocked by Immobilizer 
            P1570 - 35-10 -  - Intermittent
18613 - Performance Malfunction in Cooling System 
            P2181 - 35-10 -  - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09G-927-750.clb
   Part No: 09G 927 750 L
   Component: AQ 250 6F           0301  
   Coding: 0008201
   Shop #: WSC 01236 785 00200
   VCID: 3A7B0E5F76DCCEF160B-5140

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8N0-907-379-MK60-F.lbl
   Part No: 8N0 907 379 J
   Component: ESP FRONT MK60      0101  
   Coding: 0019473
   Shop #: WSC 01236 785 00200
   VCID: 438573BB01168F3933D-5140

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03  
   Coding: 00140
   Shop #: WSC 01236  
   VCID: 285FC417C8704C6106F-2580

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N0-959-655.lbl
   Part No: 8N0 959 655 B
   Component: Airbag Front+Seite 6000  
   Coding: 01103
   Shop #: WSC 01236  
   VCID: 3F8D7F4B3DFEEBD9575-515E

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N1 920 980 E
   Component: KOMBI+WEGFAHRS. M73 D14  
   Coding: 06244
   Shop #: WSC 22567  
   VCID: 387F145718D0DCE196F-4B00
   TRUTC28N231007939     AUZ5Z0B9145163

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels: 8Nx-962-267.lbl
   Part No: 8N7 962 267 F
   Component: Central Lock/Alarm  D09  
   Coding: 15900
   Shop #: WSC 01236  
   VCID: 438573BB51168F3933D-4EEA

2 Faults Found:
01371 - Alarm triggered by Door Contact Switch; Driver's Side 
            35-00 -  - 
01374 - Alarm triggered by Terminal 15 
            35-00 -  - 

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357 
   Component: LEUCHTWEITEREGLER  D004  
   Coding: 00009
   Shop #: WSC 01236  
   VCID: 65C18D23FFE29109FD9-519A

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
   Part No: 4B0 035 186 H
   Component: concert II  NP2    0009   
   Coding: 00202
   Shop #: WSC 22161  
   VCID: 2541CD23BF6251093D9-4E96

No fault code found.

End-------------------------(Elapsed Time: 02:55)--------------------------
Tuesday,23,June,2015,14:50:54:33623
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 14.10.2.0 (x64)
Data version: 20150311
www.Ross-Tech.com


VIN: TRUTC28N231007939   License Plate: JSFUNCR
Mileage: 51717   Repair Order: 03AUDI TT1.8 AWP


                Address 01: Engine  (8N0 906 018 BD)

14:48:56
  87.0°C   Coolant Temperature
  2.83 g/s   Intake Air Mass 
  49.0°C   Intake Air Temperature
  0.2 %   Lambda (Idle) Self-Adaptation
  -2.3 %   Lambda (Partial) Self-Adaptation
  990.0 mbar   Boost Pressure (specified)
  1010.0 mbar   Boost Pressure (actual)
  0.0 %   Wastegate (N75) Duty Cycle
 
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Uwe

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In a car that old, it's not something missing from VCDS. Modules in that car will only support sequential tests, a sequence that's pre-programmed into each module. There's also a question of what module really commands the fans.. Try Output Test in 01-Engine and 17-Instruments too, to see if there's one that turns 'em on full-blast.

-Uwe-
 
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victor35ma

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Uwe said:
...There's also a question of what module really commands the fans.. Try Output Test in 01-Engine and 17-Instruments too, to see if there's one that turns 'em on full-blast.

-Uwe-
Click to expand...

agreed on old model. what module really commands the fans? thanks Mr Uwe for that... that's the question and that's explain everything thank you.

Nothing in engine nor instruments...I have been reading schematics and they both are connected by the same solid state power relay. not a module. controlled by a thermal switch attached to rad tanks ( old fashion way to control fans). Thanks.
 
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Uwe

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No "ECT Overheat" test in the cluster? I seem to recall that being in at least some of the VW clusters, and it would command the fan(s) to full on.

-Uwe-
 
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AIB Wolfgang

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Out of my documents, it must be possible to activate the fans by output test in module 08 Klima.
 
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DrPeter

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Hello,

so, I tried output test 08 Hvac /03 output... 1 out 2 cooling fan runs for a few seconds only fan for HVAC start up. every other component runs just fine. my question: are they supported (both the fans). why both fans didn't come on? is it something in VCDS or is just not supported
Click to expand...


On this vehicle (2003 Audi TT) the J293-Coolant Fan Control control module (Front left engine compartment, next to radiator) is responsible for activating the fans. It receives input signal from the HVAC Controller to activate the fans, it also receives inputs from the F18-Coolant Fan Control thermal switch to run the fans which is to cool the engine as needed.


- The 08-HVAC controller should have an [Output] test for the following:

Coolant Fan Switched ON
A/C Clutch (N25)
A/C compressor cut-in
Fresh Air Blower-V2
Temperature Regulator Flap Motor-V68
Central Air Flap Motor-V70
Footwell/Defroster Flap Motor-V85
Air Flow Flap Motor-V71
Interior Temperature Sensor Fan -V42
Segment test
Outside Air Temp. Display-G106
Idle Air Control Regulation



Please note the following:

- Be sure to select the Output test and let it run (will run for about 60 seconds), do not skip over the test that you wish to perform.

- The coolant Fans will run when the N25-A/C Clutch output test is activated and when the HVAC system is operational (N25 is on) with the Engine running.

- Fan speed 2 is only achieved if the signal for high engine temperature from the F18 is present or the High Side pressure of the AC system closes the F129-A/C pressure switch


Hope this helps,

drpeter
 
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victor35ma

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DrPeter said:
Hello,




On this vehicle (2003 Audi TT) the J293-Coolant Fan Control control module (Front left engine compartment, next to radiator) is responsible for activating the fans. It receives input signal from the HVAC Controller to activate the fans, it also receives inputs from the F18-Coolant Fan Control thermal switch to run the fans which is to cool the engine as needed.


- The 08-HVAC controller should have an [Output] test for the following:

Coolant Fan Switched ON
A/C Clutch (N25)
A/C compressor cut-in
Fresh Air Blower-V2
Temperature Regulator Flap Motor-V68
Central Air Flap Motor-V70
Footwell/Defroster Flap Motor-V85
Air Flow Flap Motor-V71
Interior Temperature Sensor Fan -V42
Segment test
Outside Air Temp. Display-G106
Idle Air Control Regulation



Please note the following:

- Be sure to select the Output test and let it run (will run for about 60 seconds), do not skip over the test that you wish to perform.

- The coolant Fans will run when the N25-A/C Clutch output test is activated and when the HVAC system is operational (N25 is on) with the Engine running.

- Fan speed 2 is only achieved if the signal for high engine temperature from the F18 is present or the High Side pressure of the AC system closes the F129-A/C pressure switch


Hope this helps,

drpeter
Click to expand...

Got it... thanks for this explanation....

Car is gone by now but. after replacing fans assy I tried to do this very test, but only one fan tend to run for a few (seconds ( HVAC ) since they are connected by same solid state relay I would say both supposed to run.

Next time I will follow your instructions. funny thing is; since I am learning VCDS. I relay on Snap-On scan tools for for some easy bi-directional and I knew the fan was bad. Now I will use VCDS properly see I can manage to perform the test. thanks for you response.
 
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Jack@European_Parts

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If you read the repair manual and traced the function of the circuits in WD....... you would know that both fans are to come on at the same time.

You know you can turn the fans on in this car by simply turning on the AC?

When changing the fans in this model....... it is pretty routine to change the module in this car and the fan switch in radiator.

Battery acid likes to leak on the module, and cause all kinds of havoc in that area for connectivity + ground issues which make the fan run hot!
 
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