Passat Wagon L4-2.0L (ABA) (1995)
A/C Signal: Testing and Inspection
Air Conditioning Compressor Signal, Checking
Special tools, testers and auxiliary items
-
VAG 1551 Scan Tool (ST) or vehicle system tester VAG 1552 with VAG 1551/3 adapter cable
-
VAG 1598/18 test box
-
Multimeter (Fluke 83 or equivalent)
-
VW 1594 connector test kit
-
Wiring diagram
Check conditions
-
Air conditioning OK
-
Air conditioning switched off
-
Vehicle interior ambient temperature above 15 °C (59 °F)
-
No malfunctions stored in Diagnostic Trouble Code (DTC) memory See "On-Board Diagnostic/Checking Diagnostic Trouble Code Memory
(Function 02)". See: Testing and Inspection
Test sequence
-
Connect VAG 1551 scan tool (VAG 1552) and insert "Engine Electronics" address word 01. Carry out selection at idle. See "On-Board
Diagnostic/Connecting VAG 1551 Scan Tool and Selecting Function". See: Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
-
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
-
Press -0-, -0- and -5- to input display group number 005.
-
Press -Q- button to confirm input.
Indicated on display (1, 2, 3 and 4 = Display fields)
Read measuring value block 5
->
1
2
3
4
-
Observe 5-digit block in display field 4.
-
1st and 2nd positions from left must display zero
Display __00
-
Switch on air conditioner (lowest temperature and highest blower speed).
-
1st and 2nd positions from left must now display 1
Display __00
If the display is not as described: