Passat Sedan 4Motion W8-4.0L (BDP) (2002)
O2 Sensor Regulation Before (TWC), Check
Function test
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Select the lambda test results and check whether the specified values are being reached, Diagnostic mode 5: Check output of oxygen sensor
signals. Refer to "Scan Tool Testing/Diagnostic Mode 5: Check Output of Oxygen Sensor Signals"
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 5: Check
Output of Oxygen Sensor Signals
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End diagnostic and switch ignition off.
If specified values are not obtained:
Checking oxygen sensor wires
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Connect test box to control module wiring harness, connect test box for wiring test. Refer to "Scan Tool Connecting/Test Box, Connecting For
Wiring Test". See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Disconnect 6-pin harness connector to the respective oxygen sensor:
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Heated Oxygen Sensor (HO2S) -G39-, bank 1 6-pin harness connector (black) -1-,
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Heated Oxygen Sensor (HO2S) 2 -G108-, bank 2 6-pin harness connector (brown) -2-.
NOTE:
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Bank 1 = Cylinder bank 1, in direction of travel, right
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Bank 2 = Cylinder bank 2, in direction of travel, left
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Check wires between test box and 6-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 Ohms