TT Roadster L4-1.8L Turbo (AWP) (2003)
A/C Signal: Testing and Inspection
Air Conditioner Compressor Shut-off, Testing
NOTE:
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The air conditioner compressor signal informs the engine control module that the compressor will be switched on in 140 ms.
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The engine control module can send a signal via the same wire to shut off the air conditioner compressor.
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The engine control module will shut off the air conditioner compressor in the following circumstances:
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Under heavy acceleration (full throttle in 1st gear)
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In emergency running mode (back-up)
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When the "Basic setting" function is started (function 04)
Requirements for test:
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Air conditioner okay
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No faults stored in Diagnostic Trouble Code (DTC) memory of engine control module Vehicle at room temperature (above + 15 degree C)
Test sequence
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Connect the vehicle diagnostic, testing and information system VAS 5051, and select the vehicle system "01 - Engine electronics" from the menu.
When doing this the engine should be idling. See: Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With
Manufacturer's Scan Tool/Scan Tool Connecting and Initial Checks/Connecting VAS 5051/VAG1551 Scan Tool
Display on VAS 5051:
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Select the diagnosis function "08 - Read data block" from the menu -1-.
Display on VAS 5051:
1
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Enter display group
(figures up to 255)
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Using the keypad -2-, enter "050" to select Display group 050 and confirm entry with Q button.