Mercury MerCruiser MCM 454 Mag MPI Service Manual page 524

SERVICE MANUAL NUMBER 23
CLEANING AND INSPECTION
1. Clean the exterior of the ECM with a dry cloth being careful to avoid contact with
2. Inspect outer surfaces for damage.
3. Visually inspect electrical pins at both ends of ECM for straightness and corrosion.
4. Visually inspect J1 and J2 connectors on the wiring harness for corrosion and terminals
NOTE: The ECM is a sealed electrical component. If a Code 51 or 52 check has shown it
to be defective, replace the unit with another ECM having the same part number as the origi-
nal.
INSTALLATION
1. Mount new ECM to electrical bracket.
2. Connect J1 and J2 electrical connectors to the ECM.
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
connector pins.
that may have backed out of the harness.
a
Typical
a - Electrical Bracket
b - ECM
c - J1- Electrical Connector (Front Connector)
d - J2- Electrical Connector (Rear Connector)
MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY
d
c
b
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