With Manufacturer's Scan Tool
Check DTC Memory (function 02)
- Press buttons -0- and -8- to insert "AC/Heating Electronics" address word 08 and advance program until "Select function XX" appears on display. Selectable Functions When Using VAG 1551/1552 or VAS 5051
- Switch printer on by pressing PRINT button (indicator lamp in button comes on).
Indicated on display (function selection)
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -2- to select "Check DTC Memory" function 02.
Indicated on display
Rapid data transfer Q
02 - Check DTC Memory
- Press -Q- button to confirm input.
Number of stored DTCs is displayed
Rapid data transfer Q
X DTC recognized
- Press -> button.
If "No DTC recognized" is displayed, the program returns to the starting position after -> button is pressed.
Rapid data transfer Q
No DTC recognized
- Press -> button.
NOTE:
- If the printer is switched on, stored DTCs are displayed and printed out in sequence.
- If the printer's switched off, the -> button must be pressed in order to display the next DTC.
If DTC are displayed:
- Refer to DTC table and check and repair as instructed. About Trouble Codes
- Operate A/C system and check DTC memory (function 02) to confirm repair.
- Erase DTC memory (function 05).
- Confirm A/C control head -E87- coding (function 01), and if necessary code -E87- (function 07).
- Perform basic setting (function 04).
- Check DTC memory (function 02), if malfunctions are stored, erase DTC memory (function 05).
- VAG1551 Scan Tool (ST) can be returned to the function mode by pressing the -> button.
Indicated on display (function selection)
Rapid data transfer HELP
Select function XX
- End output (function 06). End Output (function 6)
- Switch ignition off and disconnect VAG1551 Scan Tool (ST) from Data Link Connector (DLC).
If no DTC are displayed and A/C system complaints exist (e.g. compressor does not run or only occasionally, system control unsatisfactory, speed of fresh air blower cannot be regulated etc.):
- Read measuring value block (function 08).
- Perform Output Diagnostic Test Mode (DTM) (function 03).
- Check A/C system cooling performance. A/C System Cooling Performance, Testing
- VAG1551 Scan Tool (ST) can be returned to the function mode by pressing the button.
Indicated on display (function selection)
Rapid data transfer HELP
Select function XX
- End output (function 06). End Output (function 6)
- Switch ignition off and disconnect VAG1551 Scan Tool (ST) from Data Link Connector (DLC).
NOTE:
- 1997 > If A/C control head -E87- is unable to determine the duration of time when ignition is off ("standing time"), DTC 01206 "signal for time span ignition off" is loaded into memory. The A/C control head will then default to a standing time greater than 4 hours. The actual measured values of the outside temperature sensor are then used as instantaneous outside and engine temperature inputs for A/C system control. When the "heating" mode is selected under these conditions, fresh air blower -V2- has a delayed start (even when the actual standing time is less than 4 hours and the engine is warm). Read Measuring Value Block. The outside air temperature display -G106- may also indicate incorrect outside temperature values. Display Group Number Table
- If both display fields of the A/C control head do not light with ignition switched on check control head coding. Testing and Inspection