BMW 5251 Service Manual page 398

130-8
Fuel Injection
With ignition off, remove main relay (K6300) (arrow) in
E-box.
-
With ignition on and relay installed, check for battery voltage
on terminal 2 (87).
4
Check for voltage at terminal 8 (30) on relay socket.
If battery voltage is present, relay has energized and is
functioning correctly.
Gmund from
6L
(hot
~ 4 t h k ~ y
key in
E r n
2I
' 1
on
position)
to
Fuel
pump
RdiWt Rd from Battery
and other
system components
S O Z I ~ O ~ ~ I ~ Y
If battery voltage is not present and all earlier tests are OK,
relay is faulty and should be replaced.
If battery voltage is present continue testing.
If battery voltage is not present, check fuse 109 (80-amp
fusible link) under passenger seat carpet. See ELE Elec-
trical Wiring Diagrams.
-
Reinstall relay and turn ignition on. Gain access to back side
of relay socket and check for ground on terminal 4 (85).
If ground is present continue testing.
If ground is not present, signal from ECM is missing. Check
NOTE-
I f no faults are found during testing but power is not reaching
the
ECM
or other components, check the fuses in the fuse
carrier X8680
in the E-box.
wire between ECM and relay.