WM 477601 Checking Vacuum Pump (Except Cayenne, Cayenne GTS, Cayenne Turbo S, Cayenne S, Cayenne S E-Hybrid, Cayenne Turbo, Cayenne S Diesel, Cayenne (3.0)): Information

Information 

The vacuum pump creates the necessary vacuum for the following components and functions:

• The variable intake system on naturally aspirated engines (secondary load). 
• Sports flap exhaust system (secondary load). 
• The tank leakage test on US vehicles (secondary load). 
• Wastegate control on turbo vehicles (secondary load). 
• Brake booster (main load - large connection) 

Defects in the specified systems can be caused by a defective vacuum pump. To avoid replacing components based on suspected defects and repeat repairs, the function of the vacuum pump must be checked.

The vacuum pump -1-  is fitted at the rear of the right cylinder head on V-engines.

Fig 1: Identifying Vacuum Pump (Mechanical)

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 2: Identifying Vacuum Pump With Connections

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. Vacuum pump
2. Screw, M6 x 25
3. Sealing ring
4. Sealing ring
5. Secondary load connection