D 250 Pickup L6-359 5.9L DSL (1992)
Engine Control Module: Description and Operation
General Operation
PURPOSE
The ECU's purpose is to achieve optimum fuel economy and performance combined with low emission levels.
OPERATION
As input signals to the ECU change, the ECU adjusts the responses sent to the output devices. There are seven modes of operation that determine
how the ECU responds to the various input signals.
MODES OF OPERATION
The diesel fuel injection system has the following modes of operation:
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Ignition switch ON
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Engine start-up (Crank)
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Engine warm-up
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Cruise or Idle
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Acceleration
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Deceleration
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Ignition switch OFF
