Test sequence

Switch ignition off.
NOTE: Test must be performed within 15 minutes after switching off ignition.
Remove rubber seal from plenum chamber in direction of (arrow).
Remove plenum chamber cover -1- from front.

Fig 1: Removing Rubber Seal From Plenum Chamber

Courtesy of AUDI OF AMERICA, INC.

Fig 2: Removing Cover For Electronics Box In Plenum Chamber

Courtesy of AUDI OF AMERICA, INC.

Disconnect Coolant Circulation Pump Relay -J151- from socket 2.
NOTE: On some vehicles, Coolant Circulation Pump Relay -J151- may be installed in position No. 4 in relay panel.

Fig 3: Identifying Coolant Circulation Pump Relay

Courtesy of AUDI OF AMERICA, INC.