Sensor Power; Circuit Description; Block Water Pressure Sensor - Mercury V6 175 Diagnostic Manual

Sensors
Sensor Power C
M
g
A
4 1
A
f
H
1 4
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.
Page 5A-10
A1
TAN/BLK
D1
YEL
C2
TAN/ORN
D2
GRA/BLU
E4
M4
A1
B2 BRN
YEL
D2
WHT/ORN
B3
E3 BLK/GRN
C4 PNK/BLK
PPL/BLK
E4
H4
© 2018 Mercury Marine
PPL/BLK
TAN/BLK
BLK/GRN
BLK/GRN
YEL
PPL/BLK
124B
BLK/GRN
125A
PPL/BLK
BRN
GRA/BLU
TAN/ORN
PNK/BLK
BLK/GRN
PPL/BLK
WHT/ORN
124A
PPL/BLK
YEL
BLK/GRN
90-8M0146617 eng JULY 2018
A
B
a
C
D
E
1
b
2
3
4
A
B
c
C
D
E
F
A
B d
B
C
A
C
C
e
B
A
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