Analog Value Conditioning - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

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.
90-860074--1 FEBRUARY 2002
DESCRIPTION
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