3 Series E46 318d (M47TU) SAL
VS-21/Löschan
Baugruppe/Group: 13
13 02 01 (745)
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Service function "Injector volume compensation"
E46 / M47TU
Situation:
With the introduction of common rail technology on the M47TU engine, the new DDE 5
allows a cylinder-selective injector volume compensation. On this engine, this results in a
further improvement in the exhaust emissions levels.
The injector compensation value is determined by the manufacturer and printed on the top
of each injector as an individual 6-digit letter/number code (please refer to Fig. 1)
During vehicle production, the compensation values of the injectors are allocated to the
appropriate cylinder and stored in the DDE control unit.
In service, injector volume compensation is only necessary after the DDE control unit has
been replaced or individual (or all) injectors have been exchanged.
Affected
vehicles:
All E46 vehicles with M47TU
Procedure:
A. In case of control unit replacement
Until DIS CD 28 is issued (approx. December 2001), compensation values will have to be
read off from the injectors and manually entered into the new control unit via the service
function "Injector volume compensation". To do this, it is necessary to remove the acoustic
cover from the cylinder head and from the lower section of microfilter housing.
From DIS CD 28, the injector volume compensation values in "old control units" that are still
capable of communications will be read off as part of the familiar programming procedure,
together with the vehicle identification, and then transferred to the new control unit.
B. In case of injector replacement
If injectors are replaced or rearranged, an injector volume compensation must be
performed.
The service function "injector volume compensation" can be found in the DIS Tester under
=> Function selection => Service functions => Drive
=> Digital diesel electronics => Calibration => Injector volume compensation
=> Test plan => Injector volume compensation
The service function first shows the compensation values stored for each cylinder.
Using the selection "Enter new compensation values", the cylinder whose injector has been
replaced must be entered. The compensation value can be read off from the affected
injector and entered.
Repeat this procedure until all new compensation values for each cylinder have been
entered.
When the service function is ended, the compensation values are stored in the control unit.
SI Service function "Injector volume compensation" E46 M47TU
BMW AG - TIS
11.02.2013 10:42
Issue status (12/2007) Valid only until next DVD is issued
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