Manifold Absolute Pressure Sensor - G71- / Intake Air Temperature Sensor - G42-, Checking: Notes

General Description 

The Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- is located downstream of the throttle on the intake manifold, and measures the pressure and air temperature in the intake manifold and transmits the values to the Engine Control Module -J623-.

The Engine Control Module -J623- uses the Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- signal to calculate a correction value for the charge air pressure. Evaluation of the signal gives consideration to the influence of temperature on the density of the charge air.

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 .

Test Procedure