Shown on:
Name Description Value
Units (*=user
selected)
Explanation
Eng.
tab
Ves.
tab
X SparkAdv Spark advance Engine dependent Degrees
Indicates degrees of spark advance for each cylinder.
NOTE: Slight variation in these numbers is normal; this indicates
that load balancing is functioning properly.
X SSEngOpr
Engine speed and load
steady state
0 or 1 Status
This is 0 if the engine speed is varying by more than 100 RPM,
and 1 if engine speed is varying less than 100 RPM.
X SysVolt System voltage Typical: 12.0–14.5 Volts
The DC voltage measured by the PCM on the output side of the
system, as it is being supplied to components on the engine.
Typical values range from 12.0–14.5 V.
X TPS1_ADC Throttle position sensor A 10–1013 Counts
The throttle position sensor has a total range from 0–1024
counts, with a usable range from 10–1013. These counts are
used to calculate the actual throttle position.
X TPS2_ADC Throttle position sensor B 10–1013 Counts
The secondary throttle position sensor has a total range from 0–
1024 counts, with a usable range from 10–1013. This sensor
provides redundancy, and allows the PCM to compare its values
to the primary sensor.
X TrailerMode Trailer mode True or False –
This displays True, if the engine is in the trailer range. It is used
to limit maximum engine angle.
X TrimPos_ADC Trim position sensor 0–1024 Counts
The number of counts associated with the trim position sensor.
The sensor has a total range from 0–1024 counts, with a usable
range from 50–950. The result of the actual position contributes
to the trim position percent value.
X TrimPospercent Trim position 0–100 Percent
Trim position as a percentage. The fully trimmed‑in position is
shown as 0%. Trailer position is shown as 100%.
X UD_ShiftIntoFwdCnts Shifts into forward Continuous Counts Indicates the number of forward shift occurrences.
X UD_ShiftIntoRevCnts Shifts into reverse Continuous Counts Indicates the number of reverse shift occurrences.
X UEGO1_HeaterDutyCycle
O2 sensor heater duty
cycle, port S1
0–100 Percent
This value shows what percentage of time the O2 heater is on in
order to maintain the required temperature. (Refer to
UEGO1_Ri_Temp.)
X UEGO1_phi Equivalence ratio, port S1 ±1.00 Ratio
The equivalence ratio, or phi, is the ratio of the actual fuel/air
ratio to the targeted ratio. If this number is above 1.00, the
engine is running rich. If it is below 1.00, it is running lean.
X UEGO1_Ri_Temp
O2 sensor temperature,
port S1
768–791
(1416–1456)
ºC (ºF)*
UEGO sensors operate at 768–791 °C (1416–1456 °F). The
UEGO1_HeaterDutyCycle should vary accordingly to maintain
this temperature.
X XDRPa Sensor supply voltage A 5.00 Volts
The 5 V reference voltage that is supplied to engine sensors.
The normal value is 5 V, plus or minus a few hundredths of a
volt.
CDS G3—Live Data
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 3C-7
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