Passat L4-1.8L Turbo (AWM) (2004)
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VAG 1598/31 adapter cable
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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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Fuse no. 34 must be OK.
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Battery voltage must be at least 11.5 volts.
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Fuel Pump (FP) relay must be OK.
Test sequence
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Connect V.A.G 1551 scan tool (VAG 1552). Start engine and select the Engine Control Module (ECM) using address word 01 (connecting scan
tool and selecting ECM). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551 Scan Tool", See:
Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool
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 - 0- button to confirm input.
Indicated on display:
Read measuring value block
HELP
Enter display group number XXX
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Press buttons -0-, -4- and -1- to select "Display group number 41". Press -Q- button to confirm input.
Indicated on display: (1 to 4 - display fields)
Read measuring value block 41
->
1
2
3
4
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Check the status of the oxygen sensor heater in display field 2: Display: Htng.bef.Cat.ON/OFF
If the indication remains constant at OFF: