Checking actuation

Installation location. See COMPONENT LOCATIONS, OVERVIEW .

NOTE: 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.

Fig 1: Identifying Coolant Hoses On Coolant Expansion Tank

Courtesy of AUDI OF AMERICA, INC.

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

Fig 2: Connecting Voltage Tester VAG1527 B With Measuring Probes And Plug-In Adapters From VAG1594 A Between Terminal 2 & 1 (Checking Camshaft Position Sensor)

Courtesy of AUDI OF AMERICA, INC.

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: