Passat GLS Wagon L4-1.8L Turbo (AUG) (2001)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Before Catalyst
Sensor and Control Check
Oxygen Sensor And Oxygen Sensor Control Before Catalytic Converter, Checking
Special tools and equipment
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V.A.G 1551 scan tool (or VAG 1552 mobile scan tool) with VAG 1551/3B cable
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VAG 1598/31 adapter cable
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VAG 1526 multimeter or VAG 1715 multi meter
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VAG 1594 connector test kit
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Wiring diagram
Test requirements
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Coolant temperature must be at least 80 °C, See display group 04, display field 3
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Exhaust system must be properly sealed between catalytic converter and cylinder head.
Function test
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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
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
Enter display group number XXX
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Press buttons -0-, -3- and -0- to select "Display group number 30". Press -Q- button to confirm input.
Indicated on display: (1 to 4 = display fields)
Read measuring value block 30
->
1
2
3
4
-
Check status of oxygen sensor control before catalytic converter (display field 1): Specification: x 11
NOTE: The sensor heater is pulsed by the Engine Control Module (ECM). This is why the indication for the sensor heater alternates between 0 and 1.
Explanation of 3-digit value in display field 1: