Cartwaveforms > sensors > lambda sensor > Lambda Sensor (Titania)
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Lambda Sensor (Titania) Waveform Notes
The lambda sensor is also referred to as the Oxygen (O2) sensor plays a very important role in control of exhaust emissions on a catalytic equipped vehicle. The lambda sensor is fitted into the exhaust pipe before the catalytic converter. The sensor will have 4 electrical connections and it reacts to the oxygen content in the exhaust system and will produce an oscillating voltage between 0.5 volt (lean) to 4.0 volts, or above (rich) when running correctly.
Titania sensors unlike Zirconia sensors, require a voltage supply as they do not generate their own voltage. A vehicle equipped with a lambda sensor is said to have ‘closed loop’, this means that after the fuel has been burnt during the combustion process, the sensor will analyse the emissions and re-adjust the engine’s fueling accordingly.
Titania O2 sensors have a heater element to assist the sensor reaching its optimum operating temperature. The sensor when working correctly will switch approximately once per second (1 Hz) but will only start to switch when at normal operating temperature. This switching can be seen on the oscilloscope, and the waveform should look similar to the one in the example. If the frequency of the switching is slower than anticipated, remove the sensor and clean with a solvent spray and this may improve the response time.
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