TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
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Connect multimeter for voltage measurement as follows:
Harness connector
Measure to
Terminal
3
1
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Specification: about 5 V
If specified values are all obtained and LED does not blink with connector connected (measured between terminals 1 and 2 with engine turning or when
engine is being cranked by starter):
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Replace Camshaft Position (CMP) sensor.
If specified values are not obtained:
Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM)
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See: Testing and Inspection/Scan Tool Testing and
Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Wiring and Component Testing Using VAG1598/31 Test Box
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Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:
Harness connector
VAG1598/31 test box
Terminal
Socket
1 (B+)
98
2 (signal)
86
3 (Ground -GND-)
108
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Repair open circuit or short circuit if necessary.
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If, after erasing DTC memory for the sake of the test, a DTC relating to the Camshaft Position (CMP) sensor (hall sensor) is indicated again, even
though all previous tests were OK, the following malfunction is possible:
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Shutter wheel for Camshaft Position (CMP) sensor is not aligned properly.
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Unscrew Camshaft Position (CMP) sensor and check whether shutter wheel is mounted properly at camshaft (if mounted improperly, locking lug
will get squished when mounting bolt is tightened).
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If position of shutter wheel is OK, check orientation of crankshaft to camshaft.