Mercury 20 EFI FourStroke Service Manual

15/20 EFI FourStroke, Electric Start, Remote Control
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 - Cowl‑mounted start switch (not used)
18 - Starter solenoid power (start signal)
19 - 14‑pin connector for remote control harness
20 - Power tilt models: Cowl‑mounted power tilt switch
21 - Power tilt models: Tilt down power (power tilt pump
wires)
22 - Power tilt models: Tilt up power (power tilt pump
wires)
23 - Power tilt models: Tilt relay ground
24 - Power tilt models: Tilt relay coil ground wires
25 - Crankshaft position sensor (CPS)
26 - Warning horn
27 - Diagnostic connector
28 - Ground (coil bracket)
29 - Ground (cylinder block)
30 - Ignition coil ground
31 - Ignition coil power
32 - Oil pressure sender
33 - Warning light (power)
34 - Tach signal
35 - Warning light (signal)
36 - Engine control module (ECM)
Color Diagrams
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 9A-5

Mercury 20 EFI FourStroke Specifications

General

Brand	Mercury
Model	20 EFI FourStroke
Category	Engine
Language	English