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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
AFS (Air Flow Sensor)
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 (Air Temperature Sensor)
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 (Cylinder IDentification)
injectors are pulsed simultaneously
CTS (Coolant Temperature Sensor)
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 (Oxygen Sensor)
substitute value, open loop control
TS (Throttle Switch)
substitute values, restricted engine operation