Jetta L4-1781cc 1.8L SOHC (ACC) Can (1995)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor (HO2S), Checking
Heated Oxygen Sensor (HO2S), checking
^ Engine warm
^ Exhaust system tree of leaks between cylinder head and Three-way Catalytic Converter (TWC)
^ Heated Oxygen Sensor (H02S) voltage supply OK
^ VAG 1551 Scan Tool (ST) connected. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing
and Procedures/Scan Tool Connecting and Initial Checks/Connecting VAG 1551 Scan Tool
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Start engine and let idle.
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Operate VAG 1551 Scan Tool (ST) according to information indicated on display:
^ Rapid data transfer operating mode
^ Address word 01 for "Engine Electronics"
-
Indicated on display
[Rapid data transfer
HELP ]
[Select function XX
]
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function.
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Press button -Q- to confirm input.
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Indicated on display
[Read measuring value block
HELP ]
[Enter display group number XX
]
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Press button -0- twice to enter display group number 00, and press -Q- button to confirm input.
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Indicated on display
(1-10 = display fields)
[Read measuring value block
=> ]
[1 2 3 4 5 6 7 8 0 10
]
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Observe value in display field 1 (coolant temperature).
^ Specification: max. 22 (corresponds to mm. 85°C or 185°F coolant temperature)
Note: If necessary run the engine until the coolant reaches the minimum temperature, until the displayed value is below the maximum.
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Observe value in display field 5 (Oxygen Sensor control).
^ Specification: 106 to 150, fluctuating
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Observe value displayed in display field 6 (altitude correction factor):