Checking the Electrical Interface For Oxygen Sensor 1

Checking The Electrical Interface For Oxygen Sensor 1












Unplug the connector:
- Heated oxygen sensor 1 OBDII (592Fa)
- Connect the positive pole of a 1.5 V battery to pin 4 of the oxygen sensor's female connector and the negative pole to pin 3.







- Turn the ignition switch to the ON position.
- Contact Trionic 5 OBDII.







Reading: O2S 1
The reading should be: 1.4 V

Checking the wiring harness.
Jiggle the leads and in-line connectors at several places and m different directions to reveal intermittent breaks and short circuits in the wiring harness Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO -

YES - Continue With Checking The Electrical Interface For Oxygen Sensor 1







- Check the fuel pressure, pressure drop and flow rate.







- Check that the EVAP canister purge valve closes under no-current conditions.







- Check that no air leakage occurs in the exhaust system ahead of oxygen sensor 1 or its mounting.

Is the function correct?

NO - Continue With Checking The Electrical Interface For Oxygen Sensor 1

YES -

- Rectify the fault.

After performing this procedure