A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Camshaft Position Sensor: Testing and Inspection
Camshaft Position (CMP) Sensors, Checking
Special tools, testers and auxiliary items required
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Multimeter V.A.G 1526 or equivalent.
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Test Box 105 Pin VAG1598/42.
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Adapter Lead Vag1598/39 VAG1598/39.
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Adapter cable V.A.G 1598/39-1.
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) Sensor G40.
Test requirements
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Fuses for Engine Control Module (ECM) J623 OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N" .
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
Checking activation
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Remove engine cover - arrows -.
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Disconnect the electrical harness connector - 1 - at Camshaft Position (CMP) Sensor G40.
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Using the Voltage Tester VAG1527B or equivalent, check for voltage between terminal 1 and terminal 2 with the electrical harness connector
connected to Camshaft Position (CMP) Sensor G40.
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Operate the starter briefly.
The LED must blink.
NOTE: Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and
then get significantly brighter during activation.
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Switch ignition off.
If the LED does not blink:
Checking voltage supply