5 Series E34 525td (M51) TOUR
E36 325 tds /EC II
105 kW
2 246 666
E39 525 tds
E38 725 tds
105 kW
105 kW
2 246 144
2 246 144
RHD vehicles
E36 325 td
85 kW
2 245 202
E36 325 td /EC II
85 kW
2 246 668
E36 325 tds
105 kW
2 245 203
E36 325 tds /EC II
105 kW
2 246 670
E34 525 td
85 kW
2 245 146
E34 525 tds
105 kW
2 245 147
E39 525 tds
105 kW
2 246 144
B.
Check sensors
Check that electrical wires and plug contacts on the mass air flow sensor, intake air
temperature sensor, electrical changeover valve and/or AGR pressure converter and
charge pressure sensor are conducting electrical power.
-
Interrogate fault memory
-
Check vacuum line between AGR valve and electrical changeover valve and/or
pressure converter for leaks and ensure it is correctly routed. Pull off hose and blow
through with compressed air to remove any oil residue which may have entered in the
form of oil vapour from the crankcase breather.
-
Check function of pressure converter:
With the engine at operating temperature, pull vacuum hose off AGR valve The DDE
activates the AGR valve on a 20 sec. cycle. With the engine at raised idle speed, you
can check for vacuum build up with your finger.
Comment:
Exhaust re-circulation is switched off when:
1.
There is a fault in the needle movement sensor (injector nozzle with sensor,
cylinder 3 or 4)
2.
There is a defect in the DDE control unit with AGR feedback control or its output
stage
3.
There is a fault in mass air flow sensor
4.
Speed sensor on engine not operating in plausible manner
-
Check charge pressure line between manifold for intake air and charge pressure
sensor for leaks and ensure it is correctly routed (e.g. no sharp bends).
Pull off hose and blow through with compressed air to remove any oil residue which
may have entered in the form of oil vapour from the crankcase breather.
-
Check function of charge pressure sensor:
With engine at idle speed, interrogate charge pressure measuring value with a status
query to the DDE control unit. The DDE measures absolute pressure values, not
overpressure values! The displayed value must be approximately the same as ambient
pressure (approx. 1000 hPa), because no significant level of charge pressure
develops at idle speed. If this is not the case and if there is no defect in the electrical
system, replace the charge pressure sensor.
-
Only on vehicles without a hot-film mass air flow sensor:
Unclip charger temperature sensor from manifold and check for contamination. Now
SI Troubleshooting of air supply and exhaust re-circulation (AGR) M41 M51
BMW AG - TIS
23.01.2013 05:52
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 3 -
