Camshaft Position (CMP) sensor, checking: Notes

Fig 1: Identifying Special Tools - Camshaft Position (CMP) Sensor, Checking

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Special tools and equipment 

• VAG1526 A
• VAG1527 B
• VAG1594 A
• VAG1598/31

• VAS5051 with VAS5051/1

Installation location. Refer to Component locations, overview 

NOTE:

Fig 2: Removing Coolant Hoses

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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 

Fig 3: Connecting Voltage Tester VAG1527 B With Measuring Probes And Plug-In Adapters From VAG1594 A Between Terminal 2 (CMP Sensor Signal) And Terminal 1 (Positive)

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• Connect voltage tester VAG1527 B with measuring probes and plug-in adapters from VAG1594 A between terminal 2 (CMP sensor signal) and terminal 1 (positive); connector remains plugged in.

• Operate starter for a few seconds.

• LED should flash.

If LED does not flash:

Checking power supply 

Fig 4: Disconnecting Electrical Harness Connectors At Camshaft Position (CMP) Sensor -G40- And Camshaft Position (CMP) Sensor 3 -G300-

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

Fig 5: Disconnecting Electrical Harness Connectors And At Camshaft Position (CMP) Sensor 2 -G163- And Camshaft Position (CMP) Sensor 4 -G301-

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

Fig 6: Identifying 3-Pin Connector Terminals 1 & 3

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• Connect multimeter as follows to measure voltage:

• Switch ignition on.

• Specified value: approx. 5 V

Checking signal wire 

Fig 7: Identifying 3-Pin Connector Terminals 1 & 3

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• Connect multimeter as follows to measure voltage:

• Switch ignition on.

• Specified value: approx. battery voltage

Checking ground wire 

Fig 8: Identifying 3-Pin Connector Terminals 1 & 3

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

Fig 9: Identifying 3-Pin Connector Terminals 1 & 3

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

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

Fig 10: Identifying 3-Pin Connector Terminals 1 & 3

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

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

• Repair any open/short circuit as necessary.