sensor AUDI A3 1999 8L / 1.G ATW Engine Ignition System Owner's Manual

28-48
If LED does not blink:

Checking voltage supply

- Disconnect connector at Camshaft Position
(CMP) sensor.

Checking signal wire - Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Measure to
1 Engine Ground (GND)
- Switch ignition on.

Specification: about 5 V
- Connect multimeter for voltage measurement as follows:
Harness connector
Terminal
Measure to
2 Engine Ground (GND)
- Switch ignition on.

Specification: approx. battery voltage
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Checking Ground (GND) wire

If all specified values are being reached and the LED does not blink
(measured between terminal 1 and 2 with starter and connector
connected):
If specified values are not obtained:
Checking wire connections between Camshaft Position (CMP)
sensor and Engine Control Module (ECM) - Check following wire connection for open circuit and short circuit to B+:Harness connector
Terminal
Measure to
3 B+
- Repair open circuit or short circuit if necessary.
- Replace Camshaft Position (CMP) sensor.
- Connect VAG1598/31 test box at wiring harness to Engine Control
Module (ECM), do not connect ECM Page 24
-19
.
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If, after erasing the DTC memory for a 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:
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine
Code(s): AEB, ATW, Repair Group 15; Valvetrain, servicing
- Check following wire connections for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
Terminal
VAG1598/31 test box
Socket
1 (B+) 98
2 (signal) 86
3 (Ground -GND-) 108
- Repair open circuit or short circuit if necessary.

Shutter wheel for Camshaft Position (CMP) sensor is not aligned
properly.
- 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).
- If position of shutter wheel is OK, check allocation of
crankshaft/camshaft.
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