Golf GTI L4-2.0L (ABA) (1997)
A/C Signal: Description and Operation
Special Tools, Testers And Auxiliary Items
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VAG 1551/1552 Scan Tool With VAG 1551/3 Adapter Cable.
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VAG 1598/18 Test Box
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Multimeter (Fluke 83 Or Equivalent)
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Connector Test Kit VW 1594
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Wiring Diagram
Check Conditions
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Function of A/C OK
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A/C switched off
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Interior of vehicle is at room temperature, above 15°C (59°F)
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No malfunctions stored in Diagnostic Trouble Code Memory.
Test Sequence
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Engine running at idle
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Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01.
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-, -0- and -8- for display group 008 and press -Q- button to confirm input.
Indicated on display (1-4 Display fields)
Read Measuring Value Block 8-->
1 2 3 4
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Switch on A/C (lowest temperature and highest blower speed).
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Check specifications for A/C (display fields 3 and 4)
Display Group 008: ECM Signals
NOTE: The A/C compressor will be switched off, when the ECM recognizes full load and the air conditioning is switched on (A/C-HIGH).
Continuation
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If the display does not indicate as described: