Camshaft Position (CMP) Sensor, Checking
Camshaft Position (CMP) Sensor, Checking
Special Tools and Equipment
- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31
NOTE:
- Camshaft Position (CMP) Sensor -G40- is located at rear of left cylinder block (bank 2).
- Camshaft Position (CMP) Sensor 2 -G163- is located at front of right cylinder block (bank 1).
Checking activation
- Slide back rubber grommet at connector of the respective Camshaft Position (CMP) Sensor (connector remains connected to Camshaft Position (CMP) Sensor).
- Connect VAG1527B voltage tester between sockets 2 (CMP sensor signal) and 1(B+).
NOTE: Connector socket numbers are shown on the rear side of the connector.
- Operate starter for a few seconds.
- LED must blink briefly at every second engine rotation.
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.
If LED does not blink:
Checking voltage supply
- Disconnect connector at respective Camshaft Position (CMP) sensor.
- Switch ignition on.
- Connect multimeter for voltage measurement as follows:
Harness connector Terminal Measure to
1 Engine Ground (GND)
- Specification: about 5 V
Checking signal wire
- Connect multimeter for voltage measurement as follows:
Harness connector Terminal Measure to
2 Engine Ground (GND)
- Specification: approx. battery voltage
Checking Ground (GND) wire
- Connect multimeter for voltage measurement as follows:
Harness connector Terminal Measure to
3 B+
- Specification: approx. battery voltage
- Repair open circuit or short circuit if necessary.
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 respective Camshaft Position (CMP) sensor.
If specified values are not obtained:
Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM)
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Refer to "Scan Tool Testing/Wire And Component Test Using VAG1598/31 Test Box", Testing and Inspection
- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:
Camshaft Position (CMP) Sensor 2 -G40- (bank 2)
Harness connector Terminal VAG1598/31 test box Socket
1 (B+) 98
2 (signal) 86
3 (Ground -GND-) 108
Camshaft Position (CMP) Sensor 2 -G163- (bank 1)
Harness connector Terminal VAG1598/31 test box Socket
1 (B+) 98
2 (signal) 87
3 (Ground -GND-) 108
- Repair open circuit or short circuit if necessary.
- 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:
- Shutter wheel for Camshaft Position (CMP) sensor is not aligned properly.
Check phase position of Camshaft Position (CMP) sensor
- Connect VAS5O51 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. Refer to "Scan Tool Testing/Scan Tool Connecting And Initial Checks", Testing and Inspection
Engine must run at idle for this.
When indicated on display:
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.
When indicated on display:
Read Measuring Value Block Q
Input display group number XXX
- Press buttons -0-, -9- and -3- to select "display group number 093" and press -Q- button to confirm input.
When indicated on display:
Read Measuring Value Block 93 ->
1 2 3 4
- Check specified values of Camshaft Position (CMP) sensor
If specified values are obtained:
- Press -> button.
Indicated on display (function selection):
Rapid data transfer HELP
Select function XX