E3 Checking the Pressure Switch (Turbo Only)

E3 Checking the pressure switch (Turbo only)

Tools:
- Multimeter
- Pressure testing equipment 83 93 514
- Cooling system tester




1 Connect the pressure testing equipment to the intake pipe and the cooling system tester to the branch connection on the pressure gauge.

2 Start the engine. Raise the pressure until it corresponds to that at which the switch should open and break the circuit. The engine should now stall.

If the engine does not stop, check the breaking pressure of the pressure switch as follows:

Connect the multi meter to pin 87 of the main relay and pin 86 of the fuel pump relay.

3 Raise the pressure. The power supply circuit should be broken when the opening pressure of the pressure switch is reached.

Breaking pressure: 0.95 ± 0.05 bar (13.7 ± 0.7 psi).

If the pressure switch breaking pressure is incorrect, fit a new pressure switch.