Fuel Quality Sensor - G446-, Checking: Notes

General Description 

The Fuel Quality Sensor -G446- uses two measuring electrodes immersed in the fuel flow in the fuel line upstream of the fuel injectors. The fuel becomes an electrical element (dielectric) of the sensors electrical circuit. The resistance of the fuel changes depending on ethanol content. These electrical variables are measured, and reported to the Engine Control Module -J623-. The Engine Control Module -J623- then calculates the necessary mixture and ignition corrections applicable to a particular set of engine operating characteristics.

Special Tools And Workshop Equipment Required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.

Test requirements 

• Fuses OK.
• Battery voltage OK.
• Switch OFF all electrical and electronic accessories.
• Vehicles with automatic transmission, ensure the selector lever position is in "P".
• Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
• Observe all safety precautions: SAFETY PRECAUTIONS .
• View clean working conditions: CLEAN WORKING CONDITIONS .