Automatic Climate Control system, On-Board Diagnostic (OBD)

Diagnostic Trouble Code (DTC) Table

NOTE:
- Listed in the following in ascending order of DTC codes are all DTCs which are detected by the operating and display module, Climatronic Control Module J255 and displayed on the Diagnostic Operation System VAS 5051A on checking the content of the DTC memory.
- The content of the DTC memory is retained until the memory is erased. Function 05 - Erasing DTC Memory
- Sporadic faults are marked "/ SP" on the display.
- In the case of sporadic faults, always pay particular attention to the possibility of loose contacts in the connectors.
- If defective components are displayed on reading out the DTC memory, use the wiring diagram to additionally check for short circuit and open circuit in the wiring to the components.
- Check the appropriate plug contacts before replacing a component.
- Before replacing the operating and display module, Climatronic Control Module J255, additionally check the power supply and Ground (GND) connections.
- With the Audi Cabrio, different settings are stored for closed and open convertible top in the operating and display module, Climatronic Control Module J255. On opening and closing the convertible top, the operating and display module, Climatronic Control Module J255 then automatically alters the setting to the value last set with convertible top closed or open.
- Always perform basic setting (function "04") after replacing an air conditioner component. Then read out the DTC memory, eliminate any faults displayed and erase the DTC memory (functions "02" and "05").
- The display of the operating and display module, Climatronic Control Module J255 is switched from degrees C centigrade) to degrees F (Fahrenheit) and vice versa by pressing the "Temperature + left" button with the "recirculated-air button" pressed.
- Checking cooling output of air conditioner. Component Tests and General Diagnostics
- If the compressor output has been reduced 30 times during a driving cycle because of incorrect pressure in the refrigerant circuit, e.g. due to a loose contact (in the wiring to the High Pressure Sensor G65), the A/C Compressor Regulator Valve N280 is no longer activated and the compressor is thus shut off. The compressor can be re-activated by pressing the "Auto" button or by switching the ignition off and on again.
- If a malfunction is detected at the potentiometer in one of the air distribution control motors, the air distribution can be influenced by pressing the buttons on the operating and display module, Climatronic Control Module J255.
- If temperature regulation is found not to be working properly but no DTC is displayed:
- Check proper installation of temperature sensors.
- Check for interchanged wiring to Sunlight Photo Sensor G107 and that the correct version of the Sunlight Photo Sensor G107 has been installed (different versions for vehicles up to and as of VIN 400000 in Model Year 2005 for Sedan and Avant; gradual introduction for the Cabrio in week 46/ 04 with no prior specification of any particular VIN).
- Check operation of Interior Temperature Sensor Fan V42 (installed in operating and display module, Climatronic Control Module J255).
- Check activation of the two temperature doors via the corresponding control motor.
- A message is no longer displayed for certain types of malfunctions if the DTC memory is checked using the Fault Read Out Device V.A.G 1551 or Mobile Scan Tool V.A.G 1552 (DTC code is no longer incorporated into program card for these Fault Readout Devices).
- On vehicles with 8-cyl. engine, the compressor is not driven via a belt, but rather by way of a shaft.