15/20 EFI FourStroke with Electric Start, Tiller Handle, and Power Tilt
1 - Injector #1
2 - Injector #2
3 - Idle speed control valve (idle air control)
4 - Vapor separator tank/high‑pressure fuel pump
5 - Temperature and manifold absolute pressure
(TMAP) sensor
6 - Throttle position sensor (TPS)
7 - Engine coolant temperature (ECT) sensor
8 - 20‑amp fuse (stator output)
9 - Voltage rectifier/regulator
10 - Stator
11 - Starter solenoid ground
12 - Battery negative (–)
13 - Starter
14 - Starter solenoid
15 - Battery positive (+)
16 - 15‑amp fuse (starting control circuit power, tilt switch
power when engine is not running)
17 - Neutral start switch
18 - Cowl‑mounted start switch
19 - Not used
20 - Tiller handle stop push button
21 - Tiller handle E‑stop switch (lanyard operated)
22 - Tiller handle power tilt switch
23 - Tiller handle 14‑pin harness connector
24 - 14‑pin connector for tiller harness
25 - Cowl‑mounted power tilt switch
26 - Tilt down power (power tilt pump wires)
27 - Tilt up power (power tilt pump wires)
28 - Tilt relay ground
29 - Tilt relay coil ground wires
30 - Crankshaft position sensor (CPS)
31 - Warning horn
32 - Diagnostic connector
33 - Ground (coil bracket)
34 - Ground (cylinder block)
35 - Ignition coil ground
36 - Ignition coil power
37 - Oil pressure sender
38 - Warning light (ground)
39 - Tach signal
40 - Warning light (signal)
41 - Engine control module (ECM)
Color Diagrams
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 9A-7
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