Substitute Values/Self-Diagnosis

OPERATION
Engine speed signal
The Electronic Throttle Control (EML) derives the current engine speed from the Engine Speed Signal (TD) which comes from the Digital Motor Electronic (DME). When this signal corresponds to an engine speed greater than 7000 rpm. a speed of 4000 rpm is used to calculate the characteristic map. The EML control unit recognizes the engine speed range from 500 rpm to 6800 rpm as valid for characteristic map calculations.

Road speed signal
The EML derives the current road speed from the road speed signal (speed-A signal) which comes from the instrument cluster. The EML recognizes the range from 0 to 167 mph (270 km/h) as valid. When the signal corresponds to a speed in excess of 167 mph (270 km/h) a speed of 20 mph (32 km/h) is used for the function.

Engine temperature
The EML detects the engine temperature with the aid of its own temperature sensor. The EML recognizes the range from 40° C to 140° C as valid. A substitute value of approx. 40° C is used for the function outside this range.