Fuel Pump Relay: Testing and Inspection

Checking the Fuel Pump Relay

Tools:
- Multimeter
- Breakout Box 86 11 006
- Test cables 86 11 352


1 Unplug the LH control module and mass air flow sensor connectors. Connect Breakout Box 8611 006.




2 Ground pins 20 and 21 (pins 17 and 21 for LH 2.2).

3 Check that battery voltage is present at:
- the injectors
- Control module connector pin 9
- The mass air flow sensors
pin 2 (-M1987 fuel injection engine, -M1988 turbo engine)
pin 5 (M1988- fuel injection engine, M1989- turbo engine)
- Fuse 14

If voltage is present at these points the fuel pump relay and appurtenant leads are OK.

If it is not, continue checking as described in the following.

4 Remove the glove box and withdraw the relay panel.




5 Check that battery voltage is applied to relay terminal 30. If it is not, check the lead to main relay terminal 30.

6 Check that voltage is present on terminal 86 of the fuel pump relay (relay operated).

If it is not, check that voltage is present on main relay terminal 87.

If it is not, see "Checking the main relay". Testing and Inspection

If voltage is present, check that the pressure switch (LH 2.2 turbo engine) and the lead between pump relay terminal 86 and main relay terminal 87 is OK (main relay not operated).

7 Ground pump relay terminal 85 and check that terminals 87 and 87B are live (main relay operated). If they are not, change the relay.