Camshaft Position (CMP) Sensor, Checking

Camshaft Position (CMP) Sensor, Checking







Special tools and equipment
- VAG 1526A
- VAG 1527B
- VAG 1594A
- VAG 1598/31
- VAS5051 with VAS5051/1

NOTE:






To gain access to the connectors on cylinder bank 2 (left), 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 VAG 1527 B with measuring probes and plug-in adapters from VAG 1594 A between terminal 2 (CMP sensor signal) and terminal 1 (positive); connector remains plugged in.

NOTE: Receptacles are numbered accordingly on the back of the connector.

- Operate starter for a few seconds.
- LED should flash.

NOTE: 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:

Connector Measure to
terminal
1 Engine ground

- Switch ignition on.
- Specified value: approx. 5 V

Checking signal wire
- Connect multimeter as follows to measure voltage:

Connector Measure to
terminal
2 Engine ground

- Switch ignition on.
- Specified value: approx. battery voltage

Checking ground wire
- Connect multimeter as follows to measure voltage:

Connector Measure to
terminal
3 Battery positive

- 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 VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. Wiring and Component Testing Using VAG1598/31 Test Box
- Check for open circuit and short to positive or ground in following wiring connections:
- Camshaft position (CMP) sensor -G40- (Bank 1)

Connector Test box VAG 1598/31
terminal Socket
1 (positive) 98
2 (signal) 87
3 (ground) 108

- Camshaft position (CMP) sensor 2 -G163- (Bank 2)

Connector Test box VAG 1598/31
terminal Socket
1 (positive) 98
2 (signal) 86
3 (ground) 108

- Camshaft position (CMP) sensor 3 -G300- (Bank 1)

Connector Test box V.A.G 1598/31
terminal Socket
1 (positive) 98
2 (signal) 81
3 (ground) 108

- Camshaft position (CMP) sensor 4 -G301 - (Bank 2)

Connector Test box V.A.G 1598/31
terminal Socket
1 (positive) 98
2 (signal) 54
3 (ground) 108

- 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". Engine must be running at idling speed. Connecting VAS 5051 Scan Tool

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-.

Display Group 093:

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