Golf GL L4-2.0L (AEG) (2001)
A/C Signal: Testing and Inspection
Signal from/to A/C compressor, checking
Special tools and equipment
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VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
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VAG1598/22 test box
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Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
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Wiring diagram
Test conditions
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Air conditioner functioning OK
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Air conditioner switched off
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No DTCs stored in DTC memory.
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All electrical consumers (e.g. lights and window defroster) switched off
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Battery (B+) voltage at least 11.5 V
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Vehicle at room temperature (warmer than + 15°C).
Test sequence
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Connect VAG1551
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Switch ignition on and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (when doing this engine must be running at idle).
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
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: 11-4 = display fields)
Read Measuring Value Block 50
->
1
2
3
4
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Check specified values for air conditioner (display fields 3 and 4).
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Observe display in display field 4.
It must show Compr. OFF.
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Switch air conditioning system on.
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Select lowest temperature and highest blower speed.