Sensor Power C
a - Oil level sensor, if equipped
b - Trim position sensor
c - Boat harness
d - Pitot pressure sensor
e - Manifold absolute pressure sensor
f - Propulsion control module connector C
g - Propulsion control module connector B
Circuit Description
PCM sensor power C (XDRP3) supplies 5 volts to the sensors identified on the preceding diagram. The purple and black wire
from pin E4 of PCM connector C connects to splices 124A and 124B, which feed all four identified sensors, as well as the boat
harness.
PCM sensor ground C (XDRG3) connects all four identified sensors and the boat harness to ground through the PCM (pin E3
of connector C). The black and green ground circuit incorporates a single splice (125A).
Block Water Pressure Sensor
NOTE: Not all models are equipped with a block water pressure sensor.
The block water pressure sensor measures the pressure of the coolant that the water pump supplies to the cylinder block. The
sensor converts the measured pressure to a voltage that is read by the PCM.
125A
124A
124B
TAN/ORN
TAN/ORN
PPL/BLK
GRA/BLU
GRA/BLU
PNK/BLK
PNK/BLK
BLK/GRN
PPL/BLK
BLK/GRN
BLK/GRN
YEL
YEL
PPL/BLK
BLK/GRN
PPL/BLK
WHT/ORN
TAN/BLK
TAN/BLK
BLK/GRN
YEL
YEL
PPL/BLK
BLK/GRN
PPL/BLK
BRN
BRN
WHT/ORN
A
B
C
A1
D1
C2
D2
E4
M4
A
B
C
D
E
F
1
2
3
4
A
B
C
D
E
A
B
C
A1
B2
D2
E3
B3
C4
E4
H4
A B
C
C
B
A
D E F
C B A
1 2 3 4
A
B
D
E
C
A B
C
D E F G H
J
K
AB
C
DE
FGH
J
K
1
3
2
4
L
M
L
M
Sensors
Page 5A-10 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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