Shown on:
Name Description Value
Units (*=user
selected)
Explanation
Eng.
tab
Ves.
tab
X J1939_Cal_ID Calibration part number
Variable but
having the form:
8M2020739
– The PCM calibration ID or identifier.
X LeanBurnCtrlState –
Normal operation/
Enable delay/
Enable ramping/
LeanBurn/
Disable ramping
Status
This identifies the current status of Lean Burn (advanced range
optimization) function.
X LeanBurnEnablementVector
Indicates whether all
conditions are met to allow
lean burn
0 or 1 Status
All parameters must be 1 to enter Lean Burn. Any parameter
displaying 0 is preventing the engine from entering Lean Burn.
X MAP_Angle
Manifold absolute pressure
(MAP)
Refer to your
service manual
kPa (psi, in.
Hg)*
The current pressure in the engine’s induction system.
X NECCTIsSteadyState Warmup state 0 or 1 Status
The engine warmup state. 1 means the temperature is in
operating range. 0 means the engine temperature has not
reached operating range.
NOTE: Normalized effective combustion chamber temperature
(NECCT) is the expected operating temperature of the
combustion chamber.
X O2Control_ITerm_Port Fuel trim port Engine dependent
Percent in
decimal form
(0.20 = 20%)
This is the multiplier by which the PCM is adjusting fuel to
achieve the desired phi. If this number exceeds ±20%, it will
trigger an ITerm fault.
The numbers in this field can appear as in the following
examples:
• 0.25, which is 25%. It means the adjustment is rich and the
system is adding fuel.
• –0.25, which is negative 25%. It means the adjustment is
lean and the system is subtracting fuel from the base fueling
curve.
X O2ControlState Fuel system control state
Open‑loop/
Closed‑loop
–
•
Open‑loop means the engine has not yet met the
requirements to go into the closed‑loop mode, the engine is
undergoing a change in demand or gear, or it is running a
diagnostic routine.
•
Closed‑loop means that the engine is in the closed‑loop
fuel control mode and responding to inputs from the O2
sensor to adjust fueling.
NOTE: While monitoring in CDS G3, in some situations the
display may show closed‑loop, when the engine is actually in
open‑loop. An engine is truly operating in closed‑loop when the
UEGO1‑phi Live Data item is a value other than 0.98.
CDS G3—Live Data
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 3C-5
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