A4 Sedan V6-2.8L (AHA) (1998)
A/C Signal: Testing and Inspection
Signal from A/C compressor, checking
Required special tools and test equipment
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VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
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VAG1598/22 test box
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Multimeter US1119 (Fluke 83 or equivalent)
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VW1594 connector test kit
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Wiring diagrams
Test conditions
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A/C functions OK
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A/C is switched off
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Vehicle at room temperature-above 15 °C (59 °F)
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No malfunctions stored in Diagnostic Trouble Code (DTC) memory.
Checking
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Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at
idle). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551/1552 Scan Tool" See: Testing and Inspection
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" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
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Press buttons -0-, -5- and -0- to input display group number 50 (050), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 50
->
1 2 3 4
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Switch on A/C (lowest temperature and highest fan position).
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Compare display with specified values for A/C (in display field 4).