Checking actuation

Installation location, see COMPONENT LOCATIONS, OVERVIEW

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.

Fig 1: Removing Cover On Left Of Engine Compartment

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.

Fig 2: Connecting Voltage Tester VAG1527 To CMP Sensor
Courtesy of AUDI OF AMERICA, INC.

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: