Mefi 3 Mcm 7.4L Mpi Bravo And Mie 7.4L Inboard - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23
MEFI 3 MCM (Sterndrive) 7.4L MPI Bravo and MIE (Inboard) 7.4L Inboard
NOTE: All BLACK wires with a ground symbol are interconnected within the EFI system har-
ness.
NOTE: Component position and orientation shown is arranged for visual clarity and ease
of circuit identification.
3
9
15
16
1 - Fuel Pump
2 - Distributor
3 - Coil
4 - Gear Lube Monitor Bottle (Not Used On MIE)
5 - Data Link Connector (DLC)
6 - Manifold Absolute Pressure (MAP) Sensor
7 - Knock Sensor
8 - Idle Air Control (IAC)
9 - Throttle Position (TP) Sensor
10 - Engine Coolant Temperature (ECT) Sensor
11 - Electronic Control Module (ECM)
12 - Fuel Pump Relay
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
2
7
8
10
6
19
11
7
13
13 - Ignition/System Relay
14 - Fuse (15 Amp) Fuel Pump
Fuse (15 Amp) ECM / DLC / Battery
Fuse (10 Amp) ECM / Injector / Ignition /
Knock Module
15 - Harness Connector To Starting/Charging
Harness
16 - Positive (+) Power Wire To Engine Circuit
Breaker
17 - OIl Pressure - Audio Warning Switch
18 - Load Anticipation Circuit (Not Used On MCM)
19 - Manifold Air Temperature (MAT) Sensor
WIRING DIAGRAMS
4
18
5
14
12
1
Page 4E-17
17
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