Service manual

DESCRIPTION
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5A-11
Analog Value Conditioning
The analog value conditioning is subdivided into two parts: sampling the analog signals and
scaling and checking the raw values.
The following analog values are made available as messages by the analog value
conditioning circuits of the ECM:
• Water temperature
• Air temperature
• Fuel temperature
• Intake manifold pressure (boost pressure)
• Atmospheric pressure
• Throttle Position (TP)
• Instrumented Injector Needle movement
• TP current
• Reference voltage
• Battery voltage
ANALOG VALUE SAMPLING
Sampling saves the results of the periodic analog/digital conversion as raw values. The
stored values are evaluated at a later time.
In addition to periodic signal sampling there is also an active speed-synchronous sampling.
Upon starts, the speed-synchronous sampling conversion that may be running is stopped.
In the next signal sampling period, the discontinued conversion is again started.