A5 Quattro Coupe V6-3.2L (CALA) (2009)
Manifold Pressure/Vacuum Sensor: Testing and Inspection
Diagnostic Procedures
Manifold Absolute Pressure Sensor, Checking
‹› The Intake Air Temperature (IAT) Sensor (G42) is an integral part of Manifold Absolute Pressure (MAP) Sensor (G71). Replacing either
component requires replacement of the entire assembly.
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› The Manifold Absolute Pressure (MAP) Sensor (G71)/Intake Air Temperature (IAT) Sensor (G42) fuse OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Coolant Temperature at least 80° C.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
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Connect the scan tool.
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Start engine and let it run at idle.
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Using the scan tool, Check the air flow quantity of the Manifold Absolute Pressure (MAP) Sensor (G71)/ Intake Air Temperature (IAT) Sensor
(G42) at idle: