3 Series E46 316i (M43TU) SAL
US and ECE vehicles, general:
From start of series production until end of
series production
Except for
the following US vehicles:
E46/M54
from start of series
production to March 2003.
E53/M54
from start of series
production to October 2003
Procedure:
In case of customer complaint, proceed as follows:
(the secondary air pump is actuated via the DIS tester)
-
Secondary air pump inoperative:
Check whether voltage is present on the secondary air pump:
If not:
Check the electrical wires and connections in the secondary air system. If necessary,
replace the actuation relay.
If yes:
Replace the secondary air pump and actuation relay.
Check whether the secondary air check valve is closed after secondary air injection
has been completed.
To do this:
Visually inspect the secondary air check valve for dirt contamination at the connection
to the pressure hose to the secondary air pump:
If there is no dirt contamination:
No further action is needed.
If dirt contamination is present (black particles / combustion residue):
Replace the secondary air check valve and electric valve (= controls the partial
vacuum in the intake manifold needed to open the secondary air check valve).
Description
Part number ("old"):
Part number ("new"):
Secondary air check valve
1 435 420
7 540 469
Electric valve
1 742 712
7 537 612
-
Secondary air pump operative:
Check the vacuum hoses from the intake system to the secondary air check valve as
well as the pressure hoses and pressure lines from the secondary air pump to the
engine for leaks and correct installation:
If necessary, replace or correctly install leaking lines, leaking or bent hoses.
No fault found in lines or hoses:
In this case, the secondary air valve is stuck or its diaphragm leaking and therefore
does not open.
Renew the secondary air check valve.
SI Failure of secondary air system (fault analysis guide) E34 E36 E38 E39 E46 E52 E
BMW AG - TIS
19.01.2013 09:18
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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