ME oxygen sensor heater, function - GF07.61-P-3024MOS
ENGINE 275.953 in MODEL 216.376, 221.176 as of Model Year 09 /AEJ 08
ENGINE 275.982 in MODEL 216.379, 221.179 as of Model Year 09 /AEJ 08
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 (O 2 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 control unit (N3/10) reads the coolant temperature sensor (B11/4).
Oxygen sensor heater function sequence
Using a ground signal, the ME-SFI control unit actuates and synchronizes the oxygen sensor heaters of the LH and RH O 2 sensors upstream of the CAT (G3/3, G3/4) and the LH and RH O 2 sensors downstream of the CAT (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).
| Electrical function schematic, oxygen sensor heating | ME Model 216 | PE07.61-P-2766-97CAA | |
| Model 221 | PE07.61-P-2766-97SAA | ||
| ME-SFI [ME] control unit, component description | N3/10 | GF07.61-P-6000MOS |