INTERNAL EMM
FUNCTIONS
ROM Verification
The EMM performs a self-test of programming every time it is turned ON. Service code 15 indicates a programming (software) issue. Reprogram the EMM with the correct software program to correct the problem.
Idle Controller
The idle controller reacts to engine operating conditions. Fuel and ignition timings are altered to maintain a specific RPM when engine is cold or warm. The controller is inactive when TPS is advanced from idle position.
RPM Limiter
This feature of EMM programming prevents engine damage due to excessive RPM. At 6250 RPM, fuel and ignition to the cylinders is shut off. Normal operation resumes when engine RPM returns to the specified range.
Neutral RPM Limiter
This feature prevents engine damage due to excessive RPM if accelerated in NEUTRAL. Neutral engine speed is limited to 1800 RPM.
Exhaust Water Valve Activation
During acceleration, the EMM opens a valve that injects water into the exhaust housing. This water changes the tuning of the exhaust, allowing the engine to develop more mid range horsepower as the boat comes on plane.
Two conditions must be met to activate the valve:
- Throttle opening above 80%
- RPM between 2500 to 4600.
The valve may not activate if the engine is accelerated slowly.
Engine Monitor and Warning Systems
Refer to ENGINE MONITORING SYSTEM on p. 84.
Refer to S.A.F.E. WARNING SYSTEM on p. 85.
Fault Code Creation and Storage
Refer to the EMM Service Code Chart at the back of this manual for a complete list of all engine fault codes.
ENGINE MONITORING SYSTEM
The MFE Engine Monitor system warns the operator of conditions that could damage the outboard:
- LOW OIL
- EMM overheated
- Engine overheated
The monitor system interrupts the ignition once per 50 engine revolutions to signal the operator.
Optional External Warning System
IMPORTANT: An optional dash mounted warning system is available for MFE 55 models through the installation of boat harness wiring kits. Refer to the Johnson/Evinrude Genuine Parts catalog.
The system includes sensors on the engine and oil tank, a warning horn, a dash-mounted gauge, and related wiring.
The EMM sends information about monitored functions to:
- An I-Command, or other NMEA 2000 compliant CAN bus network
- The System Check Modular Wiring System (boat Harness Kit P/N 586853)
- EMM LED indicators
