GF07.61-P-3024MIR ME Oxygen Sensor Heater, Function

GF07.61-P-3024MIR ME Oxygen Sensor Heater, Function
- refinement package
- as of model year 09


Function requirements for oxygen sensor heater, general points
^ Circuit 87M ON (engine control ON)
^ Engine running

Oxygen sensor heater, general points
The oxygen sensor heaters bring the oxygen sensors (O2 sensors) up to operating temperature more rapidly. With controlled heating, they also prevent damage to the oxygen sensor ceramics.

Oxygen sensor heater function sequence
The oxygen sensor heaters differ according to lambda sensor type. The function sequence is described at the following points:
^ Wideband oxygen sensor function sequence
^ Non-linear oxygen sensor function sequence

Wideband oxygen sensor function sequence
The O2 sensor on the left and right upstream of CAT (G3/3, G3/4) are constantly heated while the engine is running to achieve their function.
Temperature control and temperature measurement (by measuring the internal resistance) is performed by special control electronics in the ME-SFI [ME] control unit (N3/10)

Non-linear oxygen sensor function sequence
the ME-SFI control unit actuates the sensor heaters of the LH and RH O2 sensors downstream of the CAT (G3/5, G3/6) using a pulsed ground signal.
To do this, the ME-SFI control unit (N3/10) reads the signal from the coolant temperature sensor (B11/4)
When the exhaust system is very cold (as long as there is condensation present), the oxygen sensor heaters are switched off to prevent damage (thermal shock).