Audi 100, '94. no heat - Page 2

Hanuman · 08-11-14, 02:17 PM

Shamelessly copied from Quattroworld.

Accessing Climate Control ODB
In addition to A/C system On-Board Diagnostic (OBD) using the VAG 1551 Scan Tool, the A/C control head contains a 61-channel OBD display which can be accessed without the use of special tools.

To Access CC OBD readout:
Car ignition on
Press and hold the recirculation button
Press and hold the up arrow button
Release both buttons: "01c" will be displayed ("01c" indicates channel 1, "02c" indicates channel 2, etc.)

To select a different channel, press temperature + or temperature - buttons.
To call up information from a particular channel, select desired channel, and press the recirculation button.
To leave memory display, press the AUTO button, or switch the ignition off.

Diagnostic Channels and their descriptions [my codes in square brackets]
1 System malfunction - displayed as a Diagnostic Trouble Code (DTC). [8.5/11.7/13.5]

2 Digital value of Interior Temperature Sensor, in Headliner. [15.4]
3 Digital value of Interior Temperature Sensor, in Instrument Panel. [15.5]
4 Digital value of Fresh Air Intake Duct Temperature Sensor. [12.0]
5 Digital value of Outside Air (Ambient) Temperature Sensor, front. [12.1]
6 Digital value of Outside Air (Ambient) Temperature Sensor. [25.5] shouldn't this be the same as for 4&5?

7 Digital value of Ambient Temperature Sensor at Fresh Air Blower [11.7]
8 Digital value of Temperature Regulator Flap Motor Potentiometer. [22.8]
9 Delta value of Temperature Regulator Flap. [04.0]
10 Non-corrected specified value of Temperature Regulator Flap. [14.6]
11 Digital value of Central Flap Motor Potentiometer. [01.3]
12 Specified value of Central Flap. [00.6]
13 Digital value of Footwell/Defroster Flap Motor Potentiometer. [02.4]
14 Specified value of Footwell/Defroster Flap. [04.4]
15 Digital value of Air Flow Flap Motor Potentiometer. [25.4/25.5]
16 Specified value of Air Flow Flap. [00.0]
17 Vehicle Speed (km/h). [00.0]
18 Actual Fresh Air Blower voltage (Volts). [01.0]
19 Specified Fresh Air Blower voltage (Volts). [00.0]
20 A/C Compressor (A/C Clutch) voltage (Volts). [12.3]
21 Number of low voltage occurrences, non-transient. [00.0]
22 Cycle condition of A/C Refrigerant High Pressure Switch. [00.0]
23 Cyclings of the A/C Refrigerant High Pressure Switch. [00.0]
24 Cyclings of the switches, absolute non-fluctuating. [00.0]
25 Analog/Digital value, Kick-Down Switch. [16.3]
26 Analog/Digital value, Engine Coolant Temperature (ECT) Warning Light. [15.0]
27 Coding value. [06.1]
28 Engine Speed (RPM). [00.0]
29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28). [00.0]
30 Software version. [00.5]
31 Display check (all segments of A/C Control Head display light up). [all lit]
32 Potentiometer malfunction counter, Temperature Regulator Flap. [00.0]
33 Potentiometer malfunction counter, Central Flap. [00.0]
34 Potentiometer malfunction counter, Footwell/Defroster Flap. [00.0]
35 Potentiometer malfunction counter, Air Flow Flap. [00.0]
36 Feedback value, cold end-stop, Temperature Regulator Flap Motor Potentiometer. [24.1]
37 Feedback value, hot end-stop, Temperature Regulator Flap Motor Potentiometer. [01.8]
38 Feedback value, cold end-stop, Central Flap Motor Potentiometer. [24.0]
39 Feedback value, hot end-stop, Central Flap Motor Potentiometer. [01.7]
40 Feedback value, cold end-stop, Footwell/Defroster Flap Motor Potentiometer. [23.5]
41 Feedback value, hot end-stop, Footwell/Defroster Flap Motor Potentiometer. [01.4]
42 Feedback value, cold end-stop, Air Flow Flap Motor Potentiometer. [15.0]
43 Feedback value, hot end-stop, Air Flow Flap Motor Potentiometer. [01.0]
44 Vehicle operation cycle counter. [00.1]
45 Calculated Interior temperature (internal software, in digits). [38.0]
46 Outside (ambient) temperature, filtered, for regulation (internal software). [1.2]*
47 Outside (ambient) temperature, unfiltered, (internal software, in Celsius). [1.2]*
48 Outside (ambient) temperature, unfiltered (in digits). [12.1]
49 Malfunction counter for speedometer (vehicle speed) signal. [00.6]
50 Standing time (in minutes). [10.2]
51 Engine Coolant Temperature (ECT), in Celsius. [9.0]
52 Graphics channel 1 = 88.8, see chart, NOTE: When Diagnostic Channel 52
is selected, "--.-" is displayed first. A/C compressor switch-off conditions
are identified by illuminated segments of the "88.8" display. [>=_]
53 Graphics channel 2 = 88.8, see chart, NOTE: When Diagnostic Channel 53
is selected, "--.-" is displayed first. A/C system electrical outputs are
identified by illuminated segments of the "88.8" display. [--_|]
54 Control characteristics. [15.4]
55 Outside (ambient) temperature, in Celsius or Fahrenheit depending on the setting of the A/C control head. [1.2]*
56 Temperature in Celsius, from Interior Temperature Sensor, in Headliner. [1.2]*
57 Temperature in Celsius, from Interior Temperature Sensor, in Instrument Panel. [1.2]*
58 Temperature in Celsius, from Fresh Air Intake Duct Temperature Sensor. [1.2]*
59 Temperature in Celsius, from Outside Air (Ambient) Temperature Sensor. [1.2]*
60 Temperature in Celsius, from Ambient Temperature Sensor at Fresh Air Blower. [1.2]*
61 Software version (latest). [1.2]*

----------------------------
Diagnostic Trouble Codes
DTC Malfunction

--------------------------------------------------------------------------------

0.00 No Malfunction Present

--------------------------------------------------------------------------------

02.1 (G86) Interior Temperature Sensor, in Headliner, static open (*02.1)
02.2 Interior Temperature Sensor, in Headliner, static short, see 02.1
02.3 Interior Temperature Sensor, in Headliner, sporadic open
02.4 Interior Temperature Sensor, in Headliner, sporadic short

--------------------------------------------------------------------------------

03.1 (G56) Interior Temperature Sensor, in Instrument Panel, static open, see 02.1
03.2 Interior Temperature Sensor, in Instrument Panel, static short, see 02.1
03.3 Interior Temperature Sensor, in Instrument Panel, sporadic open
03.4 Interior Temperature Sensor, in Instrument Panel, sporadic short

--------------------------------------------------------------------------------

04.1 (G89) Fresh Air Intake Duct Temperature Sensor, static open (*04.1)
04.2 Fresh Air Intake Duct Temperature Sensor, static short, see 04.1
04.3 Fresh Air Intake Duct Temperature Sensor, sporadic open
04.4 Fresh Air Intake Duct Temperature Sensor, sporadic short

--------------------------------------------------------------------------------

05.1 (G17) Outside Air (Ambient) Temperature Sensor, front, static open (*05.1)
05.2 Outside Air (Ambient) Temperature Sensor, front, static short, see 05.1 (*05.2)
05.3 Outside Air (Ambient) Temperature Sensor, front, sporadic open
05.4 Outside Air (Ambient) Temperature Sensor, front, sporadic short

--------------------------------------------------------------------------------

06.1 (G110) Engine Coolant Temperature (ECT), A/C static open (*06.1)
06.2 Engine Coolant Temperature (ECT), A/C static short, see 06.1
06.3 Engine Coolant Temperature (ECT), A/C sporadic open
06.4 Engine Coolant Temperature (ECT), A/C sporadic short

--------------------------------------------------------------------------------

07.1 (G109) Ambient Temperature Sensor at Fresh Air Blower, static open (*07.1)
07.2 Ambient Temperature Sensor at Fresh Air Blower, static short, see 07.1
07.3 Ambient Temperature Sensorat Fresh Air Blower, sporadic open
07.4 Ambient Temperature Sensor at Fresh Air Blower, sporadic short

--------------------------------------------------------------------------------

08.1 (G92) Temperature Regulator Flap Motor Potentiometer, static open (*08.1)
08.2 Temperature Regulator Flap Motor Potentiometer, static short, see 08.1
08.3 Temperature Regulator Flap Motor Potentiometer, sporadic open
08.4 Temperature Regulator Flap Motor Potentiometer, sporadic short
08.5 Temperature Regulator Flap, static block (*08.5)
08.6 Temperature Regulator Flap Motor Potentiometer, malfunction
08.7 Temperature Regulator Flap, sporadic block

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11.1 (G112) Central Flap Motor Potentiometer, static open (*11.1)
11.2 Central Flap Motor Potentiometer, static short, see 11.1
11.3 Central Flap Motor Potentiomenter, sporadic open
11.4 Central Flap Motor Potentiometer, sporadic short
11.5 Central Flap, static block (*11.5)
11.6 Central Flap Motor Potentiometer, malfunction
11.7 Central Flap, sporadic block

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13.1 (G114) Footwell/Defroster Flap Motor Potentiometer, static open (*13.1)
13.2 Footwell/Defroster Flap Motor Potentiometer, static short, see 13.1
13.3 Footwell/Defroster Flap Motor Potentiometer, sporadic open
13.4 Footwell/Defroster Flap Motor Potentiometer, sporadic short
13.5 Footwell/Defroster Flap, static block (*13.5)
13.6 Footwell/Defroster Flap Motor Potentiometer, malfunction
13.7 Footwell/Defroster Flap, sporadic block

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15.1 (G113) Air Flow Flap Motor Potentiometer, static open (*15.1)
15.2 Air Flow Flap Motor Potentiometer, static short, see 15.1
15.3 Air Flow Flap Motor Potentiometer, sporadic open
15.4 Air Flow Flap Motor Potentiometer, sporadic short
15.5 Air Flow Flap, static block, see (*15.5)
15.6 Air Flow Flap Motor Potentiometer, malfunction
15.7 Air Flow Flap, sporadic block

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17.0 Vehicle Speed Signal faulty

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18.1 Fresh Air Blower voltage, static
18.3 Fresh Air Blower voltage, sporadic

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20.1 A/C compressor voltage not OK - static (*20.1)
20.3 A/C compressor voltage not OK - sporadic

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22.1 (F118) A/C Refrigerant High Pressure Switch, static open (*22.1)
22.3 A/C Refrigerant High Pressure Switch, sporadic open
22.5 A/C Refrigerant High Pressure Switch, 120X open (*22.5)

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29.1 Belt slip detection "soft," static
29.2 Belt slip detection "hard," static
29.3 Belt slip detection "soft," sporadic
29.4 Belt slip detection "hard," sporadic

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Remarks
*02.1 Digital default value of 128 is programmed if sensor fails
*04.1 Value supplied by Temperature Sensor is used if sensor fails
*05.1 Value supplied by Temperature Sensor is used if sensor fails
*05.2 Digital default value of 128 is programmed if sensors G89 and G17 both fail
*06.1 Engine Coolant Temperature is calculated if sensor should fail or is not
installed; diagnosis occurs only above 0oC
*07.1 Programmed corrective value = 0
*08.1 Temperature Regulator Flap Motor will no longer be controlled
automatically; manual adjustment only
*08.5 Motor is cycled, software attempts to eliminate block
*11.1 Central Flap Motor will no longer be controlled automatically; manual
adjustment only
*11.5 Motor is cycled; software attempts to eliminate block
*13.1 Footwell/Defroster Flap Motor will no longer be controlled automatically;
manual adjustment only
*13.5 Motor is cycled; software attempts to eliminate block
*15.1 Digital value is internally programmed for limp-home mode
*15.5 Motor is cycled; software attempts to eliminate block
*20.1 Compressor remains off until voltage is greater than 10.8V for at least 25 seconds
*22.1 Compressor remains off until switch closes
*22.5 Compressor re-engagement circuit, VAG 1551 Scan Tool function

-------------------------------------------------
Diagnostic Channel 52 - Graphics Channel 1

A/C Compressor switch-off conditions
Note: if an A/C compressor switch-off condition exists, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate.

Segment Condition
A1 Slippage or blockage, A/C Refrigerant High Pressure Switch, 120x off
B1 Engine Speed (RPM) less than 200 - 500
C1 Engine Speed (RPM) greater than 6000
D1 Engine Speed (RPM) greater than 6000
E1 System function OK*
F1 System function OK*
G1 System function OK*
A2 A/C manually switched off (A/C standby canceled)
B2 Low Voltage
C2 Kick-down switch (via Transmission Control Module (TCM), compressor off for 12 seconds max.
E2 A/C Refrigerant Low Pressure Switch (F73)
F2 A/C Refrigerant High Pressure Switch (F118)
G2 System function OK*
A3 ECON mode selected
B3 OFF selected
C3 Outside (ambient) temperature too low
D3 Engine management system (compressor will remain off for 3 -12 seconds)
E3 High pressure occurrences more than 30 times
F3 Ambient Temperature Sensor at Fresh Air Blower (G109) less than 27 degF (-3oC)
G3 System function OK*
Decimal Point Visible: A/C compressor ON
Not Visible: A/C compressor OFF
*segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK.

Diagnostic Channel 53 - Graphics Channel 2

Active electrical outputs
Note: When a NO system electrical output is activated, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate. The decimal point in the "88.8" display will not illuminate in this channel.

Segment Condition
A1 Fan for interior temperature sensor
B1 Fresh air/recirculation flap closed (recirculation mode)
C1 Heater valve closed
D1 Bi-directional wiring harness
E1 A/C compressor ON
F1 coolant fan first speed ON
G1 System function OK*
A2 Air flow flap open
B2 Air flow flap open
C2 Air flow flap closed
D2 Footwell/Defroster flap in "Footwell" position
E2 Footwell/Defroster flap in "Footwell" position
F2 Footwell/Defroster flap in "Defroster" position
G2 System function OK*
A3 Central flap in "instrument panel outlet" position
B3 Central flap in "instrument panel outlet" position
C3 Central flap in "footwell outlet/defrost" position
D3 Temperature flap in "cold air" position
E3 Temperature flap in "cold air" position
F3 Temperature flap in "warm air" position
G3 System function OK*

* Segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK

Hanuman · 08-11-14, 02:31 PM

Quote:

Originally Posted by msh

Could you explain your last sentence a bit more throughly?

I have quoted the information found in a post on another forum. Some of the returned values from my A/C controller appear to be outside of the range available. ie 00.6
Some codes/values are not listed at all; The codes seem to generally follow the format of two large font digits and one small font. Some codes don't follow that format. It is probably irrelevant, though.

As the reported faults appear to be related to the flap position, then that's where I'll start. Although just levering the flap open sounds tempting. It's lashing down, and the wind is driving it horizontally. That's enough for today.

shaun5 · 08-11-14, 05:09 PM

This thread has helped me, just got the air-con working on my S6 but it constantly blows hot air.
After a bit of research I found the info you have given above and my code is 8.5 which would explain things.
When ive got time I will be stripping my motor down also.

Flying Frank · 08-11-14, 05:17 PM

Reading the above reminds why I liked my old Type 2 Camper Van....when it got too hot you WOUND open the window and when it got too cold, you put another blanket over your knees......

msh · 09-11-14, 06:28 AM

Quote:

Originally Posted by The Real MSH!

shouldn't this be the same as for 4&5?

I haven't tried to understand how does digital value differs from analog value, but in any case readings of all three outside temp sensors could and likely will be different - first, location - first one is located next to air linlet under windscreen, second one behind front bumper, third one is located in blower housing and is actually measuring temperature inside heater, but before matrix, second, manufacturing tolerances and condidition of wiring, third, different working conditions for all three - the one in front of the car receives most of the airflow, while one in blower housing is mainly there to measure AC performance, both for fault finding and also to turn off AC if temperature drops low enough to cause ice forming on AC evaporator - GM made B3/C3 climate control used thermo switch which directly turned off compressor. In any case Hella has managed to make control unit which calculates outside temperature nicely, using several factors, it even feels strange that looking upon both ambient temperature sensor values while driving, they are different than calculated ambient temperature, but that value is the same as shown by digital outside thermometer at the destination

Hanuman · 09-11-14, 07:45 AM

Quote:

Originally Posted by msh

I haven't tried to understand how does digital value differs from analog value, but in any case readings of all three outside temp sensors could and likely will be different

Without a doubt.
However, sat overnight, and not running, the car should be stabilised at approximately one temperature. Given the label of that function, I'd expect it to be close to the other values, rather than effectively double. The outside temperature at the time was around 11-12degrees.

It's not necessarily important, though. More of an observation. Plus there are some uncontrolled factors; That list was cut and paste from another source, but not from any official documentation. It could well contain plenty of typos, interpretation errors, etc.

Anyway. Once again, not much will happen for the next few days as Scandinavia beckons, and the joys of hotel living.

Hanuman · 12-12-14, 02:27 PM

Is this the flap control linkage that I should be thinking about?

And is this the motor connection?

Gib · 12-12-14, 03:12 PM

Yes and your car is RHD so the majority of info about how quick and easy it is to do is wrong. You cant get the motor of with out removing the whole of the evap unit so you lose any charge, if you can live with this no problems as its a 20 min job to remove. If you want a more user friendly list of the check systems and other info PM me as I have the lot from earlier this year when I rebuilt the HVAC on my A6.

As a quick fix remove the cross head screw in the middle of the second picture push that unit to the drivers side of the car about 30mm and the motor arm will fall of then cable tie the other side with the arms pointing towards the front of the car.

Hanuman · 12-12-14, 03:19 PM

Cheers

I've measured the supply to the motor. Never changes from 5v. I'm hoping to drive it manually to see if it's the motor or the controller.

Gib · 12-12-14, 03:41 PM

NO and No again don't try to drive these manually they are feed back motors and you will start to get into all kinds of pain if you do . Options are remove clean and reassemble which will sort most stuck motors or drop the arm of cable tie in position and do the above when its warmer.
As for 13.5 when did you last clear the fault codes?? this is just a cycle warning not that its is or was stuck it could have just lost position due to being taken apart or various other factors.
00.# just rounding on the digital values of no concern as to use them you need to do a bit of graphing so 1dp accuracy is out of the window.

08-11-14, 02:17 PM	#11
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	Shamelessly copied from Quattroworld. Accessing Climate Control ODB In addition to A/C system On-Board Diagnostic (OBD) using the VAG 1551 Scan Tool, the A/C control head contains a 61-channel OBD display which can be accessed without the use of special tools. To Access CC OBD readout: Car ignition on Press and hold the recirculation button Press and hold the up arrow button Release both buttons: "01c" will be displayed ("01c" indicates channel 1, "02c" indicates channel 2, etc.) To select a different channel, press temperature + or temperature - buttons. To call up information from a particular channel, select desired channel, and press the recirculation button. To leave memory display, press the AUTO button, or switch the ignition off. Diagnostic Channels and their descriptions [my codes in square brackets] 1 System malfunction - displayed as a Diagnostic Trouble Code (DTC). [8.5/11.7/13.5] 2 Digital value of Interior Temperature Sensor, in Headliner. [15.4] 3 Digital value of Interior Temperature Sensor, in Instrument Panel. [15.5] 4 Digital value of Fresh Air Intake Duct Temperature Sensor. [12.0] 5 Digital value of Outside Air (Ambient) Temperature Sensor, front. [12.1] 6 Digital value of Outside Air (Ambient) Temperature Sensor. [25.5] shouldn't this be the same as for 4&5? 7 Digital value of Ambient Temperature Sensor at Fresh Air Blower [11.7] 8 Digital value of Temperature Regulator Flap Motor Potentiometer. [22.8] 9 Delta value of Temperature Regulator Flap. [04.0] 10 Non-corrected specified value of Temperature Regulator Flap. [14.6] 11 Digital value of Central Flap Motor Potentiometer. [01.3] 12 Specified value of Central Flap. [00.6] 13 Digital value of Footwell/Defroster Flap Motor Potentiometer. [02.4] 14 Specified value of Footwell/Defroster Flap. [04.4] 15 Digital value of Air Flow Flap Motor Potentiometer. [25.4/25.5] 16 Specified value of Air Flow Flap. [00.0] 17 Vehicle Speed (km/h). [00.0] 18 Actual Fresh Air Blower voltage (Volts). [01.0] 19 Specified Fresh Air Blower voltage (Volts). [00.0] 20 A/C Compressor (A/C Clutch) voltage (Volts). [12.3] 21 Number of low voltage occurrences, non-transient. [00.0] 22 Cycle condition of A/C Refrigerant High Pressure Switch. [00.0] 23 Cyclings of the A/C Refrigerant High Pressure Switch. [00.0] 24 Cyclings of the switches, absolute non-fluctuating. [00.0] 25 Analog/Digital value, Kick-Down Switch. [16.3] 26 Analog/Digital value, Engine Coolant Temperature (ECT) Warning Light. [15.0] 27 Coding value. [06.1] 28 Engine Speed (RPM). [00.0] 29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28). [00.0] 30 Software version. [00.5] 31 Display check (all segments of A/C Control Head display light up). [all lit] 32 Potentiometer malfunction counter, Temperature Regulator Flap. [00.0] 33 Potentiometer malfunction counter, Central Flap. [00.0] 34 Potentiometer malfunction counter, Footwell/Defroster Flap. [00.0] 35 Potentiometer malfunction counter, Air Flow Flap. [00.0] 36 Feedback value, cold end-stop, Temperature Regulator Flap Motor Potentiometer. [24.1] 37 Feedback value, hot end-stop, Temperature Regulator Flap Motor Potentiometer. [01.8] 38 Feedback value, cold end-stop, Central Flap Motor Potentiometer. [24.0] 39 Feedback value, hot end-stop, Central Flap Motor Potentiometer. [01.7] 40 Feedback value, cold end-stop, Footwell/Defroster Flap Motor Potentiometer. [23.5] 41 Feedback value, hot end-stop, Footwell/Defroster Flap Motor Potentiometer. [01.4] 42 Feedback value, cold end-stop, Air Flow Flap Motor Potentiometer. [15.0] 43 Feedback value, hot end-stop, Air Flow Flap Motor Potentiometer. [01.0] 44 Vehicle operation cycle counter. [00.1] 45 Calculated Interior temperature (internal software, in digits). [38.0] 46 Outside (ambient) temperature, filtered, for regulation (internal software). [1.2]* 47 Outside (ambient) temperature, unfiltered, (internal software, in Celsius). [1.2]* 48 Outside (ambient) temperature, unfiltered (in digits). [12.1] 49 Malfunction counter for speedometer (vehicle speed) signal. [00.6] 50 Standing time (in minutes). [10.2] 51 Engine Coolant Temperature (ECT), in Celsius. [9.0] 52 Graphics channel 1 = 88.8, see chart, NOTE: When Diagnostic Channel 52 is selected, "--.-" is displayed first. A/C compressor switch-off conditions are identified by illuminated segments of the "88.8" display. [>=_] 53 Graphics channel 2 = 88.8, see chart, NOTE: When Diagnostic Channel 53 is selected, "--.-" is displayed first. A/C system electrical outputs are identified by illuminated segments of the "88.8" display. [--_\|] 54 Control characteristics. [15.4] 55 Outside (ambient) temperature, in Celsius or Fahrenheit depending on the setting of the A/C control head. [1.2]* 56 Temperature in Celsius, from Interior Temperature Sensor, in Headliner. [1.2]* 57 Temperature in Celsius, from Interior Temperature Sensor, in Instrument Panel. [1.2]* 58 Temperature in Celsius, from Fresh Air Intake Duct Temperature Sensor. [1.2]* 59 Temperature in Celsius, from Outside Air (Ambient) Temperature Sensor. [1.2]* 60 Temperature in Celsius, from Ambient Temperature Sensor at Fresh Air Blower. [1.2]* 61 Software version (latest). [1.2]* ---------------------------- Diagnostic Trouble Codes DTC Malfunction -------------------------------------------------------------------------------- 0.00 No Malfunction Present -------------------------------------------------------------------------------- 02.1 (G86) Interior Temperature Sensor, in Headliner, static open (02.1) 02.2 Interior Temperature Sensor, in Headliner, static short, see 02.1 02.3 Interior Temperature Sensor, in Headliner, sporadic open 02.4 Interior Temperature Sensor, in Headliner, sporadic short -------------------------------------------------------------------------------- 03.1 (G56) Interior Temperature Sensor, in Instrument Panel, static open, see 02.1 03.2 Interior Temperature Sensor, in Instrument Panel, static short, see 02.1 03.3 Interior Temperature Sensor, in Instrument Panel, sporadic open 03.4 Interior Temperature Sensor, in Instrument Panel, sporadic short -------------------------------------------------------------------------------- 04.1 (G89) Fresh Air Intake Duct Temperature Sensor, static open (04.1) 04.2 Fresh Air Intake Duct Temperature Sensor, static short, see 04.1 04.3 Fresh Air Intake Duct Temperature Sensor, sporadic open 04.4 Fresh Air Intake Duct Temperature Sensor, sporadic short -------------------------------------------------------------------------------- 05.1 (G17) Outside Air (Ambient) Temperature Sensor, front, static open (05.1) 05.2 Outside Air (Ambient) Temperature Sensor, front, static short, see 05.1 (05.2) 05.3 Outside Air (Ambient) Temperature Sensor, front, sporadic open 05.4 Outside Air (Ambient) Temperature Sensor, front, sporadic short -------------------------------------------------------------------------------- 06.1 (G110) Engine Coolant Temperature (ECT), A/C static open (06.1) 06.2 Engine Coolant Temperature (ECT), A/C static short, see 06.1 06.3 Engine Coolant Temperature (ECT), A/C sporadic open 06.4 Engine Coolant Temperature (ECT), A/C sporadic short -------------------------------------------------------------------------------- 07.1 (G109) Ambient Temperature Sensor at Fresh Air Blower, static open (07.1) 07.2 Ambient Temperature Sensor at Fresh Air Blower, static short, see 07.1 07.3 Ambient Temperature Sensorat Fresh Air Blower, sporadic open 07.4 Ambient Temperature Sensor at Fresh Air Blower, sporadic short -------------------------------------------------------------------------------- 08.1 (G92) Temperature Regulator Flap Motor Potentiometer, static open (08.1) 08.2 Temperature Regulator Flap Motor Potentiometer, static short, see 08.1 08.3 Temperature Regulator Flap Motor Potentiometer, sporadic open 08.4 Temperature Regulator Flap Motor Potentiometer, sporadic short 08.5 Temperature Regulator Flap, static block (08.5) 08.6 Temperature Regulator Flap Motor Potentiometer, malfunction 08.7 Temperature Regulator Flap, sporadic block -------------------------------------------------------------------------------- 11.1 (G112) Central Flap Motor Potentiometer, static open (11.1) 11.2 Central Flap Motor Potentiometer, static short, see 11.1 11.3 Central Flap Motor Potentiomenter, sporadic open 11.4 Central Flap Motor Potentiometer, sporadic short 11.5 Central Flap, static block (11.5) 11.6 Central Flap Motor Potentiometer, malfunction 11.7 Central Flap, sporadic block -------------------------------------------------------------------------------- 13.1 (G114) Footwell/Defroster Flap Motor Potentiometer, static open (13.1) 13.2 Footwell/Defroster Flap Motor Potentiometer, static short, see 13.1 13.3 Footwell/Defroster Flap Motor Potentiometer, sporadic open 13.4 Footwell/Defroster Flap Motor Potentiometer, sporadic short 13.5 Footwell/Defroster Flap, static block (13.5) 13.6 Footwell/Defroster Flap Motor Potentiometer, malfunction 13.7 Footwell/Defroster Flap, sporadic block -------------------------------------------------------------------------------- 15.1 (G113) Air Flow Flap Motor Potentiometer, static open (15.1) 15.2 Air Flow Flap Motor Potentiometer, static short, see 15.1 15.3 Air Flow Flap Motor Potentiometer, sporadic open 15.4 Air Flow Flap Motor Potentiometer, sporadic short 15.5 Air Flow Flap, static block, see (15.5) 15.6 Air Flow Flap Motor Potentiometer, malfunction 15.7 Air Flow Flap, sporadic block -------------------------------------------------------------------------------- 17.0 Vehicle Speed Signal faulty -------------------------------------------------------------------------------- 18.1 Fresh Air Blower voltage, static 18.3 Fresh Air Blower voltage, sporadic -------------------------------------------------------------------------------- 20.1 A/C compressor voltage not OK - static (20.1) 20.3 A/C compressor voltage not OK - sporadic -------------------------------------------------------------------------------- 22.1 (F118) A/C Refrigerant High Pressure Switch, static open (22.1) 22.3 A/C Refrigerant High Pressure Switch, sporadic open 22.5 A/C Refrigerant High Pressure Switch, 120X open (22.5) -------------------------------------------------------------------------------- 29.1 Belt slip detection "soft," static 29.2 Belt slip detection "hard," static 29.3 Belt slip detection "soft," sporadic 29.4 Belt slip detection "hard," sporadic -------------------------------------------------------------------------------- Remarks 02.1 Digital default value of 128 is programmed if sensor fails 04.1 Value supplied by Temperature Sensor is used if sensor fails 05.1 Value supplied by Temperature Sensor is used if sensor fails 05.2 Digital default value of 128 is programmed if sensors G89 and G17 both fail 06.1 Engine Coolant Temperature is calculated if sensor should fail or is not installed; diagnosis occurs only above 0oC 07.1 Programmed corrective value = 0 08.1 Temperature Regulator Flap Motor will no longer be controlled automatically; manual adjustment only 08.5 Motor is cycled, software attempts to eliminate block 11.1 Central Flap Motor will no longer be controlled automatically; manual adjustment only 11.5 Motor is cycled; software attempts to eliminate block 13.1 Footwell/Defroster Flap Motor will no longer be controlled automatically; manual adjustment only 13.5 Motor is cycled; software attempts to eliminate block 15.1 Digital value is internally programmed for limp-home mode 15.5 Motor is cycled; software attempts to eliminate block 20.1 Compressor remains off until voltage is greater than 10.8V for at least 25 seconds 22.1 Compressor remains off until switch closes 22.5 Compressor re-engagement circuit, VAG 1551 Scan Tool function ------------------------------------------------- Diagnostic Channel 52 - Graphics Channel 1 A/C Compressor switch-off conditions Note: if an A/C compressor switch-off condition exists, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate. Segment Condition A1 Slippage or blockage, A/C Refrigerant High Pressure Switch, 120x off B1 Engine Speed (RPM) less than 200 - 500 C1 Engine Speed (RPM) greater than 6000 D1 Engine Speed (RPM) greater than 6000 E1 System function OK* F1 System function OK* G1 System function OK* A2 A/C manually switched off (A/C standby canceled) B2 Low Voltage C2 Kick-down switch (via Transmission Control Module (TCM), compressor off for 12 seconds max. E2 A/C Refrigerant Low Pressure Switch (F73) F2 A/C Refrigerant High Pressure Switch (F118) G2 System function OK* A3 ECON mode selected B3 OFF selected C3 Outside (ambient) temperature too low D3 Engine management system (compressor will remain off for 3 -12 seconds) E3 High pressure occurrences more than 30 times F3 Ambient Temperature Sensor at Fresh Air Blower (G109) less than 27 degF (-3oC) G3 System function OK* Decimal Point Visible: A/C compressor ON Not Visible: A/C compressor OFF segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK. Diagnostic Channel 53 - Graphics Channel 2 Active electrical outputs Note: When a NO system electrical output is activated, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate. The decimal point in the "88.8" display will not illuminate in this channel. Segment Condition A1 Fan for interior temperature sensor B1 Fresh air/recirculation flap closed (recirculation mode) C1 Heater valve closed D1 Bi-directional wiring harness E1 A/C compressor ON F1 coolant fan first speed ON G1 System function OK A2 Air flow flap open B2 Air flow flap open C2 Air flow flap closed D2 Footwell/Defroster flap in "Footwell" position E2 Footwell/Defroster flap in "Footwell" position F2 Footwell/Defroster flap in "Defroster" position G2 System function OK* A3 Central flap in "instrument panel outlet" position B3 Central flap in "instrument panel outlet" position C3 Central flap in "footwell outlet/defrost" position D3 Temperature flap in "cold air" position E3 Temperature flap in "cold air" position F3 Temperature flap in "warm air" position G3 System function OK* * Segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor Last edited by Hanuman; 09-11-14 at 07:36 AM.

12-12-14, 02:27 PM	#17
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	Audi 100, '94. no heat Is this the flap control linkage that I should be thinking about? And is this the motor connection? __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor Last edited by Hanuman; 12-12-14 at 02:35 PM.

12-12-14, 03:19 PM	#19
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	Cheers I've measured the supply to the motor. Never changes from 5v. I'm hoping to drive it manually to see if it's the motor or the controller. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

08-11-14, 05:09 PM	#13
shaun5 Grown up member Classic Audi Club Member Join Date: Dec 2011 Location: taunton Posts: 790	This thread has helped me, just got the air-con working on my S6 but it constantly blows hot air. After a bit of research I found the info you have given above and my code is 8.5 which would explain things. When ive got time I will be stripping my motor down also.

08-11-14, 05:17 PM	#14
Flying Frank 4 ring whore! Classic Audi Club Member Join Date: Dec 2012 Location: Kernow, Gods own county !! Posts: 2,388	Reading the above reminds why I liked my old Type 2 Camper Van....when it got too hot you WOUND open the window and when it got too cold, you put another blanket over your knees......

12-12-14, 03:12 PM	#18
Gib Grown up member Join Date: Jul 2007 Location: Abingdon in a boat about 15 foot above the roof of my house Posts: 221	Yes and your car is RHD so the majority of info about how quick and easy it is to do is wrong. You cant get the motor of with out removing the whole of the evap unit so you lose any charge, if you can live with this no problems as its a 20 min job to remove. If you want a more user friendly list of the check systems and other info PM me as I have the lot from earlier this year when I rebuilt the HVAC on my A6. As a quick fix remove the cross head screw in the middle of the second picture push that unit to the drivers side of the car about 30mm and the motor arm will fall of then cable tie the other side with the arms pointing towards the front of the car.

12-12-14, 03:41 PM	#20
Gib Grown up member Join Date: Jul 2007 Location: Abingdon in a boat about 15 foot above the roof of my house Posts: 221	NO and No again don't try to drive these manually they are feed back motors and you will start to get into all kinds of pain if you do . Options are remove clean and reassemble which will sort most stuck motors or drop the arm of cable tie in position and do the above when its warmer. As for 13.5 when did you last clear the fault codes?? this is just a cycle warning not that its is or was stuck it could have just lost position due to being taken apart or various other factors. 00.# just rounding on the digital values of no concern as to use them you need to do a bit of graphing so 1dp accuracy is out of the window.