454 / 502 Mpi And 8.2L Mpi - Sensor And Module Servicing; Precautions; Electronic Control Module (Ecm) - Mercury MerCruiser MCM 454 Mag MPI Service Manual

MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY

454 / 502 MPI and 8.2L MPI - Sensor and Module Servicing

Precautions

BEFORE attempting to disconnect and remove any module or sensor, check to
make sure that the engine ignition system is OFF. Then disconnect the negative (–)
battery cable from the terminal. DO NOT reconnect the negative (–) battery cable
until the module or sensor removed has been re-installed with secure connections.
IMPORTANT: Modules and sensors are electrical devices easily damaged by contact
with liquid cleaners or solvents. Clean with a dry cloth unless specifically directed
to do otherwise.

Electronic Control Module (ECM)

IMPORTANT: The ECM is a sensitive electrical device, subject to electrostatic
damage. DO NOT touch connector pins when removing or installing the module.
REMOVAL
1. Disconnect J1 and J2 electrical connectors at engine control module (ECM).
Typical
2. Remove ECM from electrical bracket.
Index
Page 5C-22
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Refer to "Precautions" in this section, BEFORE proceeding.
a
a - Electrical Bracket
b - ECM
c - J1- Electrical Connector (Front Connector)
d - J2- Electrical Connector (Rear Connector)
WARNING
NOTICE
d
c
b
SERVICE MANUAL NUMBER 23
72801
90-861326--1 MARCH 1999