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Home >> Porsche >> 2019 >> Cayenne S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 34 (20 Fuel Supply, Actuator 4.0L -- 9YA - Cayenne (9YA)) >> WM, 200201 Checking Fuel Pressure >> Checking Fuel Pressure

Checking Fuel Pressure

WARNING: This page is about a different variant/trim than selected.
  1. Switch on and connect PIWIS Tester. 
  2. Switch on ignition (fuel pump comes on briefly).
  3. Perform fuel pressure test using the PIWIS Tester. 
    1. 3.1  Select the Diagnostics  function.
    2. 3.2  Select the DME  control unit in the control unit overview and press F12=Next to confirm.
    3. 3.3  Switch to the Drive links/checks  menu item.
    4. 3.4  Select the Drain fuel tank  function and press F12 = Next
    5. 3.5  Activate the Drain fuel tank  function (= activate the fuel pump) by pressing F8 = Start This can be stopped at any time by pressing F8 = Stop.
    6. 3.6  Read off the pressure shown on the pressure gauge.

      Checking fuel pressure: 

      > Fuel pressure 6.5 bar +/- 0.2 bar 

    7. 3.7  Deactivate the Drain fuel tank  function by pressing F8 = Stop.
      1. 3.7.1  Exit the function.
    8. 3.8  Switch off ignition, switch off the PIWIS Tester  and disconnect adapter line in the vehicle.
    9. 3.9 Perform holding pressure test. 
      1. 3.9.1 The system pressure must only drop by max. 1 bar after 30 minutes. 

        > Pressure 5.5 bar +/- 0.2 bar 

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