TT Coupe L4-1.8L Turbo (ATC) (2001)
A/C Signal: Testing and Inspection
NOTE:
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The A/C compressor signal communicates to the ECM that the compressor will be switched on in 140 ms.
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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 conditions
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A/C system OK
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Not DTC in DTC memory of Engine Control Module (ECM)
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Vehicle at room temperature (warmer than +15 °C)
Test sequence
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Connect VAS tester or VAG 1551 scan tool and select control module for engine electronics using "address word" 01.
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Engine must run at idle for this.
When indicated on display:
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" and press -0- button to confirm input.