S4 Quattro Wagon V8-4.2L (BHF) (2008)
Camshaft Position Sensor: Testing and Inspection
Camshaft Position Sensors, Checking
The following procedure is used to diagnose both Camshaft Position (CMP) Sensor (G40) and Camshaft Position (CMP) Sensor 2 (G163)
‹› Use only gold-plated terminals when servicing terminals in harness connectors of Camshaft Position (CMP) Sensor (G40) and Camshaft Position
(CMP) Sensor 2 (G163).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Motronic Engine Control Module (ECM) ( J623) fuses 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.
‹› Ignition switched off.
Procedure
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Remove the engine cover with air filter Refer to Fuel Injection and Ignition Repair Information.
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Disconnect the Camshaft Position (CMP) Sensor ( G40) electrical harness connector - 1 -or Camshaft Position (CMP) Sensor 2 (G163).