Checking The O2 Sensor Heater

PURPOSE:
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.

OPERATION:
The oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. This characteristic is used to detect the oxygen concentration in the exhaust gas and provide feedback to the computer for control of the air-fuel ratio.

When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the oxygen sensor informs the ECM of the LEAN condition (small electromotive force: 0 volts).

When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio the oxygen concentration in the exhaust gas is reduced and the oxygen sensor informs the ECM of the RICH condition (large electromotive force: 1 volt).

The ECM judges by the electromotive force from the oxygen sensor whether the air-fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the oxygen sensor causes output of abnormal electromotive force, the ECM is unable to perform accurate air-fuel ratio control.

The heated oxygen sensors include a heater which heats the Zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.

Oxygen Sensor Heating Element Test:

1. Disconnect the oxygen sensor(s) electrical connector from the wiring harness
2. Connect DVOM across terminals 3 and 4 of the sensors electrical connector. Set to read OHMS.
3. Resistance value should be between 5 and 7 ohms.
4. Replace the sensor if the resistance reading is not within the previous specifications or if the ohmmeter indicates infinite resistance.

NOTE: Only use a high input impedance Digital Volt Ohm Meter (DVOM) when testing components on computerized vehicles.

CAUTION: Verify DVOM is set to read VOLTS only (not ohms). Verify external voltage is not applied to the sensor lead, as damage to the sensor may occur.

As always, check the service manual for the proper procedures and specifications for your particular vehicle.