Diagnostic Trouble Code (DTC) Memory, checking (function 02)
- Connect VAG 1551 Scan Tool (ST). Refer to VAG 1551 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System, connecting and selecting functions .
- Press buttons -0- and -8- to insert "AC/Heating Electronics" address word 08 and advance program until "Select function XX" appears on display. Refer to VAG 1551 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System, connecting and selecting functions .
- Switch printer on by pressing PRINT button (indicator lamp in button comes on).
| Rapid data transfer HELP Select function XX |
Indicated on display (function selection)
- Press buttons -0- and -2- to select "Check DTC Memory" function 02.
| Rapid data transfer Q 02 - Check DTC Memory |
Indicated on display
- Press -Q- button to confirm input.
| Rapid data transfer Q X DTC recognized |
Number of stored DTCs is displayed
- Press → button.
| Rapid data transfer Q No DTC recognized |
If "No DTC recognized" is displayed, the program returns to the starting position after → button is pressed.
- Press → button.
Stored DTCs are displayed and printed sequentially.
When the last DTC has been displayed and printed out, the malfunction must be repaired using DTC table. Refer to Diagnostic Trouble Code (DTC) table .
The program returns to its starting position when the → button is pressed. (The same applies when the message "No DTC recognized" is displayed.)
| Rapid data transfer HELP Select function XX |
Indicated on display
- End output (function 06). Refer to Diagnostic Trouble Code (DTC) Memory, erasing and End Output (functions 05 and 06) .
- Switch ignition off and disconnect Data Link Connector (DLC).
If a DTC was recognized:
- Repair malfunction.
- Check DTC memory (function 02).
- Erase DTC memory (function 05).
- Check control module versions (function 01) or code control module (function 07), respectively.
- Perform basic setting (function 04).
- Check DTC memory (function 02) and erase DTC memory (function 05), if necessary.
- End output (function 06).
If no DTCs have been recognized, but the air conditioning is not working properly (e.g. the compressor is not functioning or only functioning for certain periods of time, there is unsatisfactory regulation of the system or the fresh air blower speed cannot be controlled):
- Read measuring value block (function 08). Refer to Read Measuring Value Block (function 08) .
- Perform output Diagnostic Test Mode (DTM) (function 03). Refer to Output Diagnostic Test Mode (DTM) (function 03) .
- Check A/C cooling performance. Refer to A/C 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, -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. Refer to 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 illumination of the A/C Control Head -E87- does not light up when the ignition is switched on, restore the voltage supply to -E87- from terminals 88, 58d and 58s (dimming) Read Measuring Value Block: Refer to Read Measuring Value Block (function 08) , A/C Control Head -E87-, electrical testing and Electrical Wiring Diagrams, Troubleshooting & Component Locations.