Passat GLX V6 V6-2.8L (ATQ) (2001)
A/C Signal: Testing and Inspection
Signals to and From A/C System, Checking
Special tools and equipment
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V.A.G 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
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VAG 1598/31 test box
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test requirements
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The A/C system must function properly.
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A/C system must be switched off.
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There must not be any DTCs stored in DTC memory, Check DTC memory.
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Vehicle must be at room temperature (warmer than +15°C).
Test sequence
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Connect V.A.G 1551 scan tool (V.A.G 1552). Start engine and select Engine Control Module (ECM) using 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. Press - Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
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Press 0, 5 and 0 for function "display group number 50", and then press Q to exit from input mode.
Indicated on display (1 - 4 = display fields)
Read Measuring Value Block 50
->
1
2
3
4
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Observe reading in display field 4.
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Switch A/C system on.
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Set it to lowest temperature and highest fan setting. Reading in display field 4 should change to: Compr.ON
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Suddenly press accelerator pedal to wide open throttle and then release it (brief acceleration).
The reading in display field 4 should change from
Compr.ON (for a few seconds to)
Compr. OFF (compressor is switched off when vehicle accelerates).
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
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Switch ignition off.
If reading does not change: