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GM O
PERATIONAL
D
ATA
I
TEMS
that use the ECM as part of the cruise control system.
Cruise Set Speed (MPH)
Range: 0 to 255 MPH
This parameter represents the speed target for the speed control system.
This is the speed the ECM is attempting to maintain.
Desired A/F Mix (Ratio)
Range: 0 to 25.5
This parameter represents the ideal air/fuel ratio calculated by the ECM
given the current operating conditions. This value is normally 14.7, but
can change depending on operating conditions. This value should
be used along with the actual air/fuel value to make sure the mixture
solenoid is working correctly.
Desired Boost (kPa)
Range: 0 to 200 kPa
The controller calculates the boost level to obtain above the current
barometric pressure in order to maintain desirable manifold absolute
pressure. Applies to turbocharged vehicles only.
Desired EGR Posn (% Open)
Range: 0 to 100%
This parameter represents the percentage opening of the EGR valve that
the ECM has calculated for current operating conditions. This parameter
can be compared to the actual EGR position for operational verification
(see EGR Position).
Desired Idle (Steps)
Range: 0 to 255 Steps
This parameter represents the number of steps from a closed valve (no
idle control). This item can be compared to the actual valve position to
see that the valve and solenoid are operating properly and correlates to
the ECM commands.
Desired Idle Pos (Steps)
Range: 0 to 255 Steps
The desired number of steps for the idle air control motor to reach a
desired idle speed in a fuel injected engine. See Learned Idle Pos.
DFCO Spark Delay (Active / Inactive)
Deceleration Fuel Cut Out spark delay will be ACTIVE during periods of
deceleration.
Engine Cranking (Yes / No)
An indication that a signal has been sent to prepare the engine for starting
that is triggered when the key is in the start position. It should display
when the key is turned to the start position.
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