With Manufacturer Scan Tool
Check DTC Memory (function 02)
- Connect VAG1551 Scan Tool, insert address word 08 "AC/Heating Electronics" and move forward in program until "Select function XX" is displayed. Scan Tool Connecting and Initial Checks
- Switch printer on by pressing the 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- (function "Check DTC Memory" is entered with 02).
Indicated on display
Rapid data transfer Q
02 - Check DTC Memory
- Press -Q- button to confirm input.
Number of stored DTCs or "No DTC recognized" is displayed
Rapid data transfer Q
X DTC recognized
- Press -> button.
Stored DTCs are displayed and printed one after the other
If "No DTC recognized" is displayed, program returns to the starting position after button is pressed.
Rapid data transfer Q
No DTC recognized
Indicated on display (function selection):
Rapid data transfer HELP
Select function XX
- End output (function 06).
- Switch ignition off and unplug Data Link Connector (DLC).
If a DTC was recognized
1. Repair malfunction
2. Check DTC memory (function 02)
3. Erase DTC memory (function 05)
4. Check coding (function 01) or code control module (function 07), respectively
5. Perform basic setting (function 04)
6. Check DTC memory (function 02) and erase DTC memory (function 05), if necessary.
7. End output (function 06)
If no DTC was recognized and complaints have been received regarding A/C system. (e.g. compressor inoperative or intermittent, control of system unsatisfactory, fresh air blower speed cannot be regulated)
1. Read measuring value block (function 08). Reading
2. Perform output Diagnostic Test Mode (DTM), function 03. [1][2]Output Diagnostic Test Mode (DTM) (Function 03)
3. Test A/C system cooling performance. A/C System Cooling Performance, Testing
If no malfunction is recognized by A/C control head -E87- and the temperature of the air from outlets in instrument panel (left and right) can not be adjusted or controlled
- Check valves for coolant pump, electrical tests. A/C System, Electrical Test