Manufacturer's Scan Tool

Camshaft Position Sensor, Checking





Special tools, testers and auxiliary items required

• (VAG1526A)

• (VAG1527B)

• (VAG1594A)

• (VAG1598/31)

• (VAS5051) with (VAS5051/1)

Installation location. Refer to => [ Fuel Injection System Component Locations ] Locations.

• To gain access to the connectors on cylinder bank 2 (left), you must remove the cover on left of engine compartment, disconnect cable to coolant shortage indicator switch at bottom of expansion tank, remove screw (arrow) for coolant expansion tank and lay aside. Coolant hoses -1 to 3- do not have to be disconnected.





Checking actuation

- Connect voltage tester (VAG1527B) with measuring probes and plug-in adapters from (VAG1594A) between terminal 2 (CMP sensor signal) and terminal 1 (positive); connector remains plugged in.





• Receptacles are numbered accordingly on the back of the connector.

- Operate starter for a few seconds.

• LED should flash.

• Voltage testers with a low current consumption continue to glow faintly between actuation from the engine control module (rather than extinguishing completely) and become much brighter when actuated.

If LED does not flash:

Checking power supply

- Disconnect connectors - 1 - and - 2 - on Camshaft Position (CMP) sensor (G40) and Camshaft Position (CMP) sensor 3 (G300).





- Disconnect connectors - 1 - and - 2 - on Camshaft Position (CMP) sensor 2 (G163) and Camshaft Position (CMP) sensor 4 (G301).





- Connect multimeter as follows to measure voltage:









- Switch ignition on.

• Specified value: approx. 5 V

Checking signal wire

- Connect multimeter as follows to measure voltage:









- Switch ignition on.

• Specified value: approx. battery voltage

Checking ground wire

- Connect multimeter as follows to measure voltage:









• Specified value: approx. 10 V

- Repair any open/short circuit as necessary.

If the specified values are all achieved and the LED test light does not flash (measured between terminals 1 and 2 with starter connector attached),

- Install a new CMP sensor.

If the specified values are not obtained:

Checking wiring between CMP sensor and engine control module.

- Connect test box (VAG1598/31) to wiring harness for engine control module; do not connect engine control module. Refer to => [ Wiring and Component Check with Test Box VAG 1598/31 ] Wiring and Component Check With Test Box VAG 1598/31.

- Check for open circuit and short to positive or ground in following wiring connections:

• Camshaft Position (CMP) sensor (G40) (Bank 1)









• Camshaft Position (CMP) sensor 2 (G163) (Bank 2)





• Camshaft Position (CMP) sensor 3 (G300) (Bank 1)









• Camshaft Position (CMP) sensor 4 (G301) (Bank 2)





- Repair any open/short circuit as necessary.

Check phase position of CMP sensor

- Connect testing and information system (VAS5051 ) and select vehicle system "01 - Engine electronics" in selection. Refer to => [ VAS 5051, Connecting and Select Functions ] VAS 5051, Connecting and Select Functions. Engine must be running at idling speed.

Display on (VAS5051):





- Under - 1 - select diagnostic function "08 - Read measured value block".

Display on (VAS5051):





1. Enter display group

- Enter "093" for "display group number 093" in zone - 2 - and confirm entry by pressing Q button.

Display on (VAS5051):





- Check indication in display fields - 1 - to - 4 -.





- Exit function "08 - Read measured value block" by pressing arrow button.