Intake Manifold Sensor - GX9-, CHECKING: Function

Air mass and charge pressure are two factors used for engine load management. For this purpose, there are several sensors with absolutely identical functions. They measure the intake air temperature and the intake manifold pressure. The first sender unit is located upstream of the throttle valve control module J338 in the Intake Manifold Sensor -GX9- and contains the following components:

• - Intake Air Temperature Sensor -G42-.
• - Manifold Absolute Pressure Sensor -G71-.

They measure the pressure and temperature of the air in each individual cylinder bank. The values measured here correspond to the actual air mass in the cylinder bank(s).

Note the Intake Air Temperature Sensor -G42- / Manifold Absolute Pressure Sensor -G71- is also known as the Intake Manifold Sensor -GX9-.

The Intake Manifold Sensor -GX9- components cannot be serviced separately, it must be serviced as a unit.

Special tools and workshop equipment required 

• Multimeter
• Wiring Diagram
• Scan Tool