volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Heated Oxygen Sensor G39, Checking|Page 2553 > < Heated Oxygen Sensor G39, Checking|Page 2551
Page 8
background image

Test requirements

-

FuseSB11 OK.

-

Battery voltage at least 12.5 volts.

-

All electrical consumers such as, lights and rear window defroster, switched off.

-

Vehicles with automatic transmission, shift selector lever into position "P" or "N".

-

A/C switched off.

-

Ground (GND) connections between engine/transmission/chassis OK.

-

Ignition switched off.

Test procedure

-

Perform a preliminary check to verify the customers complaint.  See: Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check

Start diagnosis

-

Remove the air filter.

-

Disconnect the Heated Oxygen Sensor (HO2S) G39 electrical harness connector - 2 -.

Checking internal resistance

-

Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 terminals 3 to 4 for resistance.

Specified value: 2.5 to 10.0 ohms (at approx. 20 degrees C)

If the specification was not obtained:

-

Replace the Heated Oxygen Sensor (HO2S) G39.

If the specification was obtained:

Checking voltage supply

Heated Oxygen Sensor G39, Checking|Page 2553 > < Heated Oxygen Sensor G39, Checking|Page 2551