Possible causes, elimination, notes
No feedback signal (return-pump monitoring) to the control module.
The Porsche System Tester 2 can be used to test the function of the return pump via the Drive links menu.
To do this, call up the return pump in the Drive links menu and activate the pump (required function: return pump runs).
The complete hydraulic unit must be replaced if the return pump is damaged.
Important: Before replacing the hydraulic unit, check whether:
ground is connected to control module connector PIN 16 (from ground point 2). The locations of the ground points are shown on the wiring diagram Ground points.
- plus (vehicle voltage) is connected to control module connector PIN 17 and PIN 18.
- the plug connection on the return pump is OK.