Check DTC Memory (function 02)

Connect VAG 1551 Scan Tool (ST),
Press buttons -0- and -8- to insert AC/Heating Electronics" address word 08 and advance program until "Select function XX" appears on display.
Switch printer on via the PRINT button (indicator lamp in button lights up).
Indicated on display (function selection):

Fig 1: V.A.G 1551 Scan Tool Display - Checking DTC Memory (1 Of 5)
Courtesy of AUDI OF AMERICA, INC.
Press buttons -0- and -2- to select "Check DTC Memory", function 02.
Indicated on display:

Fig 2: V.A.G 1551 Scan Tool Display - Checking DTC Memory (2 Of 5)
Courtesy of AUDI OF AMERICA, INC.
Press -Q- button to confirm input.
Number of stored DTCs or "No DTC recognized" will be indicated on display.

Fig 3: V.A.G 1551 Scan Tool Display - Checking DTC Memory (3 Of 5)
Courtesy of AUDI OF AMERICA, INC.

Fig 4: V.A.G 1551 Scan Tool Display - Checking DTC Memory (4 Of 5)
Courtesy of AUDI OF AMERICA, INC.
Press -->button.
The stored malfunctions are displayed and printed out in sequence.
When the last DTC has been displayed and printed out, the malfunction must be repaired using DIAGNOSTIC TROUBLE CODE (DTC) TABLE .
If "No DTC recognized" is displayed, the program will return to "Select function XX" after the -->button is pressed:

Indicated on display (function selection):

Fig 5: V.A.G 1551 Scan Tool Display - Checking DTC Memory (5 Of 5)
Courtesy of AUDI OF AMERICA, INC.
End Output (function 06). See ERASE DTC MEMORY (FUNCTION 05) AND END OUTPUT (FUNCTION 06) .
Switch off ignition and disconnect diagnostic connector.

NOTE:

If a malfunction was recognized:
1. Repair malfunction
2. Check DTC memory (function 02)
3. Erase DTC memory (function 05)
4. Check coding (function 10) or code control module (function 07)
5. Carry out function 04, basic setting
6. Check DTC memory (function 02) and erase if necessary DTC memory (function 05)
7. End output (Function 06)
If no DTCs are recognized, but the air conditioning is not working properly (e.g. the compressor is not functioning, functioning only for certain periods of time or the fresh air blower speed cannot be controlled - unsatisfactory regulation):
1. Read measuring value block function 08. See READ MEASURING VALUE BLOCK (FUNCTION 08) .
2. Perform output Diagnostic Test Mode (DTM) (function 03). See OUTPUT DIAGNOSTIC TEST MODE (DTM) .
3. Check cooling performance of climate control. See A/C SYSTEM COOLING PERFORMANCE, TESTING .
If no signal for the "ignition off" period is detected by the A/C Control Head -E87- when the ignition is switched on (the signal comes from the instrument cluster), the A/C Control Head -E87- assumes that the vehicle has been left standing for more than 4 hours, and the engine temperature is assumed to be identical to the ambient temperature. If the system is in heating mode, there may be a delay before the fresh air blower switches on, even though the engine is warm (see READ MEASURING VALUE BLOCK (FUNCTION 08) ). The outside air temperature display -G106- in the instrument cluster may also display incorrect ambient temperature values.
If the two displays of the A/C control head -E87- do not light up when the ignition is switched on, restore voltage supply to terminal 58d (dimming) for -E87- according to wiring diagram. See READ MEASURING VALUE BLOCK (FUNCTION 08) and AIR CONDITIONING, ELECTRICAL TESTING .
If the two buttons of the A/C control head -E87- do not light up when the light is switched on, restore voltage supply to terminal 58s (minor control light) for -E87- according to wiring diagram. See READ MEASURING VALUE BLOCK (FUNCTION 08) and AIR CONDITIONING, ELECTRICAL TESTING .
From model year 2002 the A/C Control Head -E87- switches automatically to "Econ" operating mode, if the basic setting has not been carried out after replacing -E87-, or the measured pressure of High Pressure Sensor -G65- is too low or too high (compressor should not be switched on). See MEASURING VALUE BLOCKS (VEHICLES FROM MODEL YEAR 2002) (display group 001).
The climate control conversion on the Audi allroad does not occur with the 2001 to 2002 model year change, but instead changes in model year 2002.