Wire Color Code Abbreviations
Wire Color Abbreviations
BLK Black
BLU Blue
BRN Brown GRA Gray
GRN Green ORN Orange
PNK Pink PPL Purple
RED Red TAN Tan
WHT White YEL Yellow
LT Light DK Dark
Sensors
Crankshaft Position Sensor
The crankshaft position sensor (CPS) is a hall effect switch, which senses the collapse of a magnetic field. The CPS is located
at the top of the cylinder block, next to the flywheel.
There is a timing key (indentation) in the flywheel casting, below the ring gear, and when the key passes the CPS, the CPS
generates an electric pulse. This pulse is sent to the engine control module (ECM). The timing and frequency of the pulse
allows the ECM to regulate ignition and fuel injector timing. If the CPS fails, the engine will run rough or stop running.
Wiring Diagram
a - ECM connector
b - CPS connector
c - CPS
RED/WHT
BLK
RED/WHT
BLK
1 2
1
18
1734
17
1
10
3
2
4
5
6
7
13
15
12
11
14
16
9
8
34
18
27
20
19
21
22
23
24
30
32
29
28
31
33
26
25
Ignition
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 2A-5
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