7 Series E38 740d (M67) SAL
13 90 ...
Troubleshooting on Common Rail System at excessively low pressure
The latest diagnosis release is the definitive version.
Specified value for "actual rail pressure value",
refer to Technical Data 13 51 ...
Test requirements:
-
Connect battery charger.
-
Starter motor cranks engine properly.
Component inspection
Test sequence
Remedy
Pressure sensor at fuel distributor.
-
Disconnect pressure sensor
plug from fuel distributor.
-
Start engine.
-
If the engine starts, the
electrical lead to the pressure
sensor or the pressure sensor
is faulty.
-
Check/repair electrical lead in
engine wiring harness.
-
Replace pressure sensor.
If the engine fails to start, carry out
visual inspection for external leaks.
External leaks
-
Connect DIS Tester.
-
Call up diagnosis requests in
control unit functions of DDE4.
-
Disconnect plug from camshaft
sensor.
-
Carry out visual inspection for
external leaks.
Replacing leaking system
components:
-
Pressure accumulator,
refer to 13 53 155.
-
Pressure lines,
refer to 13 53 170.
refer to 13 53 185.
-
Connecting lines between
pressure accumulators.
-
Connecting lines between
pressure accumulators and fuel
distributor.
-
High-pressure pump,
refer to 13 51 004.
-
Injectors,
refer to 13 53 315.
Actuate starter and read off "actual
rail pressure value".
If "actual rail pressure value" is too
low, check H.P. pump and pressure
regulator.
RA Troubleshooting on Common Rail System at excessively low pressure
BMW AG - TIS
10.02.2013 03:54
Issue status (12/2007) Valid only until next DVD is issued
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