With Generic Scan Tool

Camshaft Position (CMP) Sensor -G40-, Checking







Recommended special tools and equipment
- V.A.G1526A hand multimeter
- V.A.G 1527 B Voltage Tester
- V.A.G1594A connector test kit
- V.A.G1598/31 test box

Test requirement:
- Ignition switched off.

Checking activation
- If installed, slide back rubber grommet from connector for Camshaft Position (CMP) sensor.







- Connect voltage tester e.g. V.A.G 1527 B with measuring probes and connector adapters from V.A.G 1594 A between socket 2 (CMP sensor signal) and socket 1 (B+); the harness connector remains connected.

NOTE: Connector sockets are numbered respectively on the rear side of the connector.

- Operate starter for a few seconds.
- 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.

- Switch ignition off.

If LED does not blink:

Checking voltage supply







- Disconnect harness connector (arrow) from Camshaft Position (CMP) Sensor -G40-.







- Connect multimeter for voltage measurement as follows:

Harness connector Measure to
Terminal
1 Engine Ground (GND)

- Switch ignition on.

Specified value: about 5 V

- Switch ignition off.

Checking signal wire







- Connect multimeter for voltage measurement as follows:

Harness connector Measure to
Terminal
2 Engine Ground (GND)

- Switch ignition on.

Specified value: approx. battery voltage

- Switch ignition off.

Checking Ground (GND) wire







- Connect multimeter for voltage measurement as follows:

Harness connector Measure to
Terminal
3 B+

Specified value: about 10 V

If all specified values are being reached and the LED does not blink (measured between terminal 1 and 2 with starter and connector connected):
- Replace Camshaft Position (CMP) sensor.

If specified values are not obtained:

Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM)
- Connect test box to wiring harness of Engine Control Module (ECM) ECM is not connected.. Test Box, Connecting For Wiring and Component Test







- Check the following wire connections for open circuit according to wiring diagram:

Harness connector Test box
Terminal Socket
1 (B+) 98
2 (signal) 86
3 (Ground -GND-) 108

Specified value: Wire resistance max 1.5 Ohms

- Also check wires for short circuit to each other as well as to B+ and Ground (GND).

Specified value: Infinite Ohms (no continuity)

- If necessary, repair wire connection.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Mode 3: Check DTC Memory
2. If necessary, erase DTC memory. Mode 4: Reset/Erase Diagnostic Data
3. Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.