Mercury MerCruiser MCM 454 Mag MPI Service Manual page 427

WIRING DIAGRAMS
MEFI 3 MCM (Sterndrive) 454 / 502 Mag MPI and MIE (Inboard) 454 Mag MPI
Horizon and 8.2L MPI Models
NOTE: All BLACK wires with a ground symbol are interconnected within the EFI system
harness.
NOTE: Component position and orientation shown is arranged for visual clarity and ease
of circuit identification.
3
7
8
18
14
15
1 - Fuel Pump
2 - Distributor
3 - Coil
4 - Knock Sensor (KS) Module
5 - Data Link Connector (DLC)
6 - Manifold Absolute Pressure (MAP) Sensor
7 - Idle Air Control (IAC)
8 - Throttle Position (TP) Sensor
9 - Engine Coolant Temperature (ECT) Sensor
10 - Electronic Control Module (ECM)
11 - Fuel Pump Relay
12 - Ignition/System Relay
Index
Page 4E-16
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2
6
4
9
10
5
12
11
1
13 - Fuses (15 Amp) Fuel Pump, (15 Amp) ECM /
DLC / Battery, (10 Amp) ECM / Injector /
Ignition / Knock Module
14 - Harness Connector To Starting/Charging
Harness
15 - Positive (+) Power Wire To Engine Circuit
Breaker
16 - Oil Pressure (Audio Warning System)
17 - Load Anticipation Circuit
18 - Water Temperature Sender
19 - Gear Lube Bottle (Not used on Inboard
models)
SERVICE MANUAL NUMBER 23
19
16
17
13
76001
90-861326--1 MARCH 1999