TT Quattro Coupe L4-1.8L Turbo (BEA) (2003)
A/C Signal: Testing and Inspection
A/C Compressor Shut-Off, Checking
Special tools and equipment
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VAG1526A
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VAG1594A
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VAG1598/31
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VAS5051 with VAG5051/1
or
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VAG1551 with VAG1551/3B
NOTE:
The A/C compressor signal communicates to the ECM that the compressor will be switched on in 140 ms.
The ECM can switch off the A/C compressor via the same wire connection.
Engine Control Module (ECM) switches off A/C compressor:
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during hard acceleration (Wide Open Throttle 1st gear)
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in emergency mode (emergency operation)
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after initiating basic setting (function 04)
Test requirements:
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A/C system OK
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No DTCs in DTC memory of Engine Control Module (ECM).
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Vehicle at room temperature (warmer than +15 degree C).