Passat Wagon L4-2.0L (ABA) (1995)
Engine Control Module: Testing and Inspection
Engine Control Module Voltage Supply, Checking
ENGINE CONTROL MODULE VOLTAGE SUPPLY, CHECKING
Special tools, testers and auxiliary items
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VAG 1551 Scan Tool (ST) or vehicle system tester VAG 1552 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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VW 1594 connector test kit
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Wiring diagram
Check conditions
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Battery positive voltage (B+) at least 11 volts
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Generator OK
Checking voltage supply via power supply relay J363
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Connect VAG 1551 scan tool (VAG 1552) and insert "Engine Electronics" address word 01. Carry out selection at idle. Refer to "On-Board
Diagnostic". See: Computers and Control Systems/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.
-
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-, -0- and -2- to input display group number 002.
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Press -Q- button to confirm input.
Indicated on display (1, 2, 3 and 4 = Display fields)
Read measuring value block 2
->
1
2
3
4
NOTE: If something different is indicated on the display:
See Scan tool operating instructions.
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Read value displayed in display field 3.
Specification: approx. battery positive voltage (B+) constant
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06.
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Press -Q- button to confirm input.
If the displayed value fluctuates or the battery voltage is not attained:
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Switch ignition off.