Oxygen Sensor 1 After Catalytic Converter -GX7-, Checking: General Description

The Oxygen Sensor 1 After Catalytic Converter -GX7- is positioned downstream of the primary catalytic converter and it supplies the Engine/Motor Control Module -J623- with a voltage signal (nonlinear) indicating a "rich" or a "lean" condition is present. If the primary catalytic converter is supersaturated with oxygen (indicating a lean mixture is present), the Oxygen Sensor 1 After Catalytic Converter -GX7- will send the Engine/Motor Control Module -J623- a nonlinear signal indicating the lean mixture condition. The mixture is then enriched with fuel until the oxygen has been "displaced" from the catalytic converter. This new condition, in turn, is registered by the Oxygen Sensor 1 After Catalytic Converter -GX7- as a nonlinear signal indicating the rich mixture condition. The mixture is then leaned out by the Engine/Motor Control Module -J623-. If the nonlinear signal is received again, the mixture will again be enriched. The frequency, or period, during which the mixture is enriched or leaned out is variable, being dependent on the gas flow rate (engine load) at that moment.

Note the Oxygen Sensor 1 After Catalytic Converter -GX7- is also known as the Oxygen Sensor After Three Way Catalytic Converter -G130-.

The Oxygen Sensor 1 After Catalytic Converter -GX7- contains the following components:

• Oxygen Sensor After Three Way Catalytic Converter -G130-.
• Heater For Oxygen Sensor 1 After Catalytic Converter -Z29-.

The Oxygen Sensor 1 After Catalytic Converter -GX7- components cannot be serviced separately, and they must be serviced as a unit.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.