E2 Checking the Fuel Pump Relay

E2 Checking the fuel pump relay

Tools:
- Multimeter
- Jumper lead with crocodile clips 83 93 894
- Jumper lead with switch 83 93 886





Remove fuse 30. Connect the jumper lead with switch (83 93 886) between fuse No.30 and fuse No.27, 28 or 29 so that current can be supplied to the fuel pump. Make sure that the switch is set to "OFF".

1 Unplug the control module, mass air flow sensor and auxiliary air valve connectors.

2 Connect jumper lead 83 93 894 between pins 17 and 25 of the control module connector.

3 Ascertain whether the relay operates by checking for voltage between the Limp-Home connector's grey/red (GR/RD) lead and ground (at the wiring harness on the RH wheel arch).

If no voltage is present, told back the carpeting and remove the relay.

Check for voltage between relay pin 30 (red; RD) and ground and between relay pin 86 (brown / white; BR/VT) and ground.

If no voltage is present, check the red (RD) lead between pin 30 and the positive terminal, and the brown/white (BR/VT) lead between pin 86 and main relay pin 87 (pressure switch, Turbo).

If voltage is present, use jumper lead 83 93 894 to connect pin 85 (violet; VL) to ground.

Check for voltage on relay pins 87 (blue/red;BL/RD) and 87b (grey-red; GR/RD).

If no voltage is present, fit a new relay.

If voltage is present, check the grey/red (GR/RD) lead from the Limp-Home connector to relay pin 87b.