With Generic Scan Tool

Check Camshaft Position (CMP) Sensor

Recommended special tools and equipment







- VAG1526A multimeter
- V.A.G 1527 B Voltage Tester
- VAG1594A connector test kit
- VAG1598/31 test box







NOTE: To reach the harness connectors at cylinder bank 2 (left), the left cover in engine compartment must be removed, the line to Engine Coolant Level (ECL) Warning Switch at bottom on reservoir must be disconnected, and the bolt -arrow- of the coolant reservoir must be unscrewed and set aside. Coolant hoses -1- to -3- remain connected.

Test requirement:
- Ignition switched off.

Checking activation







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

NOTE: Connector socket numbers are shown 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 electrical harness connectors -1- and -2- at Camshaft Position (CMP) Sensor -G40- and Camshaft Position (CMP) Sensor 3 - G300-.







- Disconnect electrical harness connectors -1- and -2- at Camshaft Position (CMP) Sensor 2 -G163- and Camshaft Position (CMP) Sensor 4 -G301-.







- 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. Text Box, Connecting For Wiring Test
- Check the following wire connections for open circuit according to wiring diagram:







- Camshaft Position (CMP) Sensor -G40- (bank 1)

Harness connector Test box
Terminal Socket
1 (B+) 98
2 (signal) 87
3 (Ground -GND-) 108

- Camshaft Position (CMP) Sensor 2 -G163- (bank 2)

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







- Camshaft Position (CMP) Sensor 3 -G300- (bank 1)

Harness connector Test box
Terminal Socket
1 (B+) 98
2 (signal) 81
3 (Ground -GND-) 108

- Camshaft Position (CMP) Sensor 4 -G301- (bank 2)

Harness connector Test box
Terminal Socket
1 (B+) 98
2 (signal) 54
3 (Ground -GND-) 108

- Specified value: Wire resistance max 1.5 Ohm

- Also check wires for short circuit to each other as well as to B+ and Ground (GND).
- Specified value: infinity Ohm (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". Diagnostic Mode 3: Check DTC Memory
2 - If necessary, erase DTC memory, "Mode 4: Reset/erase diagnostic data". Diagnostic Mode 4: Check Reset/Erase Diagnostic Data
3 - Generate readiness code. Diagnostic Mode 4: Check Reset/Erase Diagnostic Data

- End diagnosis and switch ignition off.