7 Series E38 730d (M57) SAL
13 90 ...
Troubleshooting on common rail system at excessively low pressure (engine does not
start)
The latest diagnosis release is the definitive version.
Setpoint value for "rail pressure actual value",
refer to Technical Data 13 51 ...
Test requirements:
-
Connect charger
-
Starter cranks engine properly
Component inspection:
Test sequence
Remedy
Pressure sensor of pressure
accumulator
-
Disconnect plug on pressure
sensor of pressure
accumulator.
-
Start engine.
-
If the engine starts, the
electrical lead to the pressure
sensor or the pressure sensor
is faulty.
-
Check/repair electric lead in
engine wiring harness.
-
Replace pressure sensor,
refer to 13 53 560 .
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.
-
Remove intake air manifold,
refer to 11 61 050 .
-
Remove all intake duct covers
without fail
-
Disconnect plug from camshaft
sensor.
-
Carry out visual inspection for
external leaks.
Replace leaking system
components:
-
Pressure accumulator,
refer to 13 53 155 .
-
Pressure lines,
refer to 13 53 170 .
refer to 13 53 180 .
-
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 High-pressure pump and
pressure regulator.
If actual value = specified value,
read out fault memory. Check stored
fault messages. Rectify faults. Now
clear the fault memory.
RA Troubleshooting on common rail system at excessively low pressure (engine does n
BMW AG - TIS
03.02.2013 04:52
Issue status (12/2007) Valid only until next DVD is issued
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