And what does it do?

The above image indicates the multiple EGT sensor positions in an exhaust system. Some vehicles may have up to six EGT sensors fitted pre and post DPF/pre and post turbo charger/pre and post catalytic converter.

The exhaust gas temperature sensors (EGTS), which are located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF), are used to detect exhaust gas temperature.
It converts the exhaust temperature into a voltage and the input signal is sent to the engine ECM. This voltage signal is used by the ECM for DPF regeneration, to improve/control emissions, fuel efficiency and catalyst control.
The ECM uses the input signal/s to determine the exhaust temperature of the DOC and DPF. The EGT sensor can detect temperatures from -40 to 1000 degrees Celsius within 10 seconds.
The sensor is a negative coefficient type thermistor sensor converting heat into resistance. The sensor is supplied with five volts from the ECM. The sensor output voltage varies with the exhaust/catalyst/DPF temperature and becomes lower as the catalyst temperature rises.
With the aid of EGT sensor, the ECM can accurately monitor the exhaust catalyst and DPF temperatures. This allows the ECM to control the post combustion fuel injection & anticipates the amount of particulate matter (PM), accumulated in the DPF in conjunction with the Exhaust Differential Pressure Sensor (EDPS).
Under certain driving conditions with this information, the ECM can take control of the fuel system and can automatically perform a regeneration of the DPF.
During regeneration higher exhaust gas temperatures are achieved, approximately 600 degrees Celsius. Engine fuel efficiency is maintained and fuel emissions are significantly reduced by maintaining catalytic converter / DPF temperatures.

A fault in the EGT sensor, can result in longer DPF regeneration time, higher fuel consumption and poor engine performance. Catalytic converter and DPF life can be compromised.
Goss have released a complete range of EGT Sensors with over 32 numbers now available. These numbers cover over one million on road vehicles, and along with the entire Goss range of products they have been through a stringent validation process.
Goss says its extensive range of products are OES engineered and sourced from global OEM suppliers, offering its customers a true Genuine Alternative.

For more information, visit www.goss.com.au for further information.