Vorstellung und Frage an Spezialisten zum Thema Kat beim 750i

[Erich]

So wie in Dänemark war es auch fuer z B U.K. und Italien, da kosteten die Kats Anfangs mehr. Was ich so im U.K. Forum gelesen habe, sind vermutlich die meisten E32 Kabelmaessig schon vorbereitet auf Kat, nur die Kats muessen nachgeruestet werden.
Ohne Kat laeuft die Motronik auf Mittelwerten dafuer, also so wie auch wenn bei der Ausfuehrung mit Kat, wenn unkonforme Rueckmeldungen aus dem System an die DME kommen. Hier mal kopiert aus der M1.1 M1.3 Beschreibung, sollte bei Deiner DME M1.2 auch so sein:
Limited Operating Strategy (LOS)
In the event of a serious fault in one or more of the sensors or their wiring circuits, Motronic will substitute a fixed default value in place of the defective sensor. This procedure is often termed limp home. A serious fault occurs when the signal from the sensor is outside of its normal operating parameters. When operating in LOS the engine may actually run quite well with failure of one or more minor sensors. Since the substituted values are those of a hot engine, cold starting and running during the warm-up period may be less than satisfactory. Also, failure of a major sensor, ie the AFS, will tend to make driving conditions less easy. Once the fault has cleared, Motronic will once more accept the live signal from the sensor. The following LOS measures are taken in the event of a failure
Component..............................Action
AFS ........................substitute values are calculated from the TS position. The load signal is fixed to 6.0 ms and the ignition timing to 20° BTDC once the TS contact is open.
ATS........................substitute value of 50° C . A code will not be set, and LOS will not commence until a minimum of 3 minutes after engine start and the engine idling for a minimum of 30 seconds.
CID sensor.............injectors are pulsed simultaneously
CO pot..................substitute value of 2.77 volts
CTS...................substitute value of 80° C if ATS value is greater than 20° .
if ATS value is less than 20° , substitute value of ATS value for first three minutes after engine start-up.
OS.....................substitute value, open loop control
TS.....................substitute values, restricted engine operation
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also bei OS = oxygen sensor.........substitute value, open loop control