Mercury MerCruiser Service Manual page 364

Electrical Components
Disconnecting or connecting the battery cables in the incorrect order can cause injury from electrical shock or can damage
the electrical system. Always disconnect the negative (‑) battery cable first and connect it last.
IMPORTANT: The PCM is a sensitive electronic device that is subject to damage from electrostatic discharge. Do not touch the
connector pins when removing or installing the module.
PCM Removal
1. Ensure that the battery cables are disconnected.
2. Remove the engine cover to gain access to the PCM.
3. Disconnect the PCM from the harness:
a. Push in the tab on the side of PCM connector C and rotate the locking lever 90°, or until it clicks. Remove the
connector from the PCM.
NOTE: When reinstalling the connectors, you will hear two clicks: once as you engage the locking mechanism on the
harness connector to the pin on the PCM connector, and a second time as you rotate the lock to a full 90° to secure
the connector.
a
b
c
a - Connector A
b - Connector B
c - Connector C
b. Remove connector B in the same manner.
c. Remove connector A in the same manner.
NOTE: When installing the PCM, attach the connectors in the reverse order: connector A first, followed by connector B,
and finally, connector C.
Page 4E-6
CAUTION
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© 2016 Mercury Marine
a
a - PCM connector locking lever
b - Locking lever tab
b
90-8M0099748 eng DECEMBER 2015
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