4. Remove the three screws that secure the PCM to the PCM bracket.
a - PCM mounting screws
5. Remove the PCM from the engine.
PCM Cleaning and Inspection
NOTE: The PCM is a sealed electrical component. If it is defective, replace the PCM.
1. Clean the exterior of the PCM with a dry cloth. Do not touch the connector pins.
2. Inspect the outer surface for any obvious damage.
3. Visually inspect the electrical pins at both ends of the PCM for straightness and corrosion.
4. Visually inspect the connectors on the wiring harness for corrosion and terminals that may have loose connections.
PCM Installation
1. Mount the PCM to the bracket using the bushings, grommets, washers, and screws. Tighten the screws to the specified
torque.
Description
Nm lb‑in. lb‑ft
PCM mounting screws 5 44.3 –
2. Connect and lock the electrical connectors to the PCM. Do not touch the connector pins.
PCM Diagnostics
Refer to PCM 112 manual.
Electrical System Overload Protection
If an electrical overload occurs, a fuse will blow or the circuit breaker will trip open. The cause must be found and corrected
before replacing the fuse or resetting the circuit breaker.
50‑Amp Main Circuit Breaker
The main circuit breaker is located at the front of the engine next to the engine oil fill port, beneath the engine cover. It provides
overload protection for the engine wiring harness and the instrumentation power lead.
Electrical Components
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 4E-7
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