15/20 EFI FourStroke with Electric Start, Tiller Handle, and Manual 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)
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 14‑pin harness connector
23 - 14‑pin connector for tiller harness
24 - Crankshaft position sensor (CPS)
25 - Warning horn
26 - Diagnostic connector
27 - Ground (coil bracket)
28 - Ground (cylinder block)
29 - Ignition coil ground
30 - Ignition coil power
31 - Oil pressure sender
32 - Warning light (power)
33 - Tach signal
34 - Warning light (signal)
35 - Engine control module (ECM)
Color Diagrams
Page 9A-6 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
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