GF07.61-P-3024MOR ME Oxygen Sensor Heater Function

GF07.61-P-3024MOR 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.

To control the oxygen sensor heaters, the ME-SFI [ME] control unit (N3/10) reads the coolant temperature sensor (B11/4).

Oxygen sensor heater function sequence
Using a ground signal, the ME-SFI [ME] control unit actuates and synchronizes the oxygen sensor heaters of the LH and RH O2 sensors upstream of the catalytic converter (G3/3, G3/4) and the LH and RH O2 sensors downstream of the catalytic converter (G3/5, G3/6).

When the exhaust system is very cold (while condensation is present), the oxygen sensor heaters are switched off to prevent damage (due to thermal shock).