Rabbit L5-2.5L (BGQ) (2008)
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to the Motronic Engine Control Module
(ECM) Power Supply Relay J271 socket 87 for voltage.
Heated Oxygen Sensor
Motronic Engine Control Module (ECM)
(HO2S)G39 electrical harness
Power Supply Relay J271 socket
connector terminal
4
87
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Switch the ignition off.
Specified value: Battery voltage.
If the specification was not obtained:
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Check the wiring for a short circuit to each other, Ground (GND), or an open circuit.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used. Perform the following step.
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Install the Test Box 105 Pin VAG1598/42.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) J623.
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Using a multimeter, check the HO2S Sensor G39 electrical harness connector terminal 3 to the Engine Control Module (ECM) J623 electrical
harness connector T121 terminal 5 for an open circuit.
HO2S Sensor G39 electrical
Motronic Engine Control Module (ECM) J623 electrical
harness connector terminal
connector T121 terminal or test box socket
3
5
Specified resistance 1.5 ohms max.
If the specification is not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.