audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 2468 > < Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 2466
Page 3
background image

-

Switch the ignition off.

Specified value: Battery voltage.

If the specification was not obtained:

-

Check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) ( G130) electrical harness connector terminal 1 to the Motronic
Engine Control Module (ECM) Power Supply Relay (J271) socket 2/87 an open circuit, a short circuit to each other, Battery (+), or Ground
(GND).

-

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-

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.

-

Install the test box.

If the manufacturers test box is not being used. Perform the following step.

-

Remove the Engine Control Module (ECM) (J623). Refer to => [ replacing ] See: Engine Control Module/Testing and Inspection/Engine Control
Module (ECM) (J623).

-

Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminal
2 to the Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 7 for resistance.

Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 2468 > < Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 2466