The activation or deactivation is accomplished with transponder technology via the ignition key. On vehicles as of 06/96 a drive authorization system stage X is installed. This drive authorization system can only be activated/deactivated with the IR transmitter or the master key. On vehicles till 05/96 a drive authorization system stage 2 is installed. After activating the drive authorization system, the engine control module renders the fuel injection system inoperative. The activation/deactivation of the drive authorization system takes place from the RCL control module (stage 2) or from the DAS control module (stage X) via CAN data bus to the engine contro9l module (ME-SFI). Vehicles with ME-SFI are equipped with a drive authorization system (DAS). Note regarding drive authorization system (DAS) stage 2 and stage X:
The following vehicle version data must be determined for coding: The coding must be performed with the Hand-Held Tester (automatically or manually, see Notes for HHT "Version coding" 11 /5). The engine control module is equipped with a version coding feature. After repair work is performed, the engine control module ME 1.0 will automatically adapt itself again. The correction towards rich or lean at idle speed is ± 1.0 milliseconds (injection duration) and at partial load the factor is 0.77 - 1.28. The self-adaptation is performed additive at idle and multiplicative under partial load. The degree of correction is constantly calculated and permanently stored. The engine control module automatically performs a mixture adjustment.
Should malfunctions occur in the form of: The Lambda control system determines the fuel injection duration so precisely that the fuel/air ratio is kept constant at Lambda level 1 (equals 14.7 kg air to 1 kg fuel) under all operating conditions. Note regarding mixture preparation self-adaptation: Readout via an on-off ratio readout or impulse counter scan tool has been eliminated. The stored DTC's can be read at the data link connector (X11/4) using the HHT only, with the ignition switched " ON " or with the "engine running". Malfunctions which are no longer present, are automatically erased as follows:Īfter three trips the "CHECK ENGINE" MIL goes out.Īfter an additional 40 warm-up periods the DTC is automatically erased.Ī warm-up period or trip is defined as follows:Įngine coolant temperature at start < 35° C,Įngine coolant temperature increases to 80 ° C.Īll emission related logic chain functions already were checked during previous trips. The DTC memory is erased when the vehicle's battery is disconnected. Intermittent contact malfunctions which have occured during a trip. Malfunctions which are constantly present, Malfunctions are recognized and stored as DTC's and are distinguished as follows:
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The engine control module (N3/10) for the ME-SFI system is equipped with diagnostic trouble code (DTC) memory. Note regarding diagnostic trouble code (DTC) readout: Preliminary work: Engine Test, Adjustment, Engines (SMS, Job No. Diagnosis - Diagnostic Trouble Code (DTC) Memory
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