Internal Emm Function
ROM Verification
The EMM performs a self-test of programming every time it is turned ON. Service code 15 indicates a programming (software) issue. Re program 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 62 50 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 t hat injects water into the exhaust housing. This water changes the tuning of the exhaust, allowing the engine to develop more midrange 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 o f 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 CANbus network
- The SystemCheck Mod ular Wiring System (boat Harness Kit P/N 586853)
- EMM LED indicators
The EMM activates the warning horn and gauge displays as follows:
- LOW OIL means that oil in the tank is at reserve level (about 1/4 full).
- NO OIL indicates the oil tank is empty.
- WATER TEMP or HOT indicates an engine or EMM overheat condition.
- CHECK ENGINE or F AULT is used to indicate other fault conditions identified by the EMM.
Refer to the EMM Service Code Chart at the back of this manual for a complete list of all engine fault codes.
All warning light circuit s are active when the engine is running. The horn circuit is active when engine speed exceeds 500 RPM.
Engine monitor warnings activate the horn for 10 seconds an d the appropriate gauge light for a minimum of 30 seconds. If the failure is momentary (for example, oil moving in the tank), the light will remain ON for the full 3 0 seconds be fore going out. If the fault continues, the light remain s ON until the key is turned OFF or the failure is corrected. The warning will reoccur at the next startup if the problem is not corrected.
S.A.F.E Warning System
The S.A.F.E. (Speed Adjusting Failsafe Electronics) warning system alerts the operator and protects against engine da mage from the following abnormal conditions:
| Code 29 | Excessive EMM temperature |
| Code 31 | Excessive engine temperature |
| Code 33 | Critical NO OIL detected |
| Code 34 | Oil injector open circuit |
| Code 117 | NO OIL |
Activation
When one of these conditions occurs, the EMM interrupts fuel injector a nd ignition operation, reducing engine speed to 2500 RPM. The dash mounted warning horn sounds and an Engine Monitor display turns on (when installed). When S.A.F.E. is active, the engine will run normally below 2500 RPM. Above 2500 RPM, the engine will shake excessively.
Recovery
The engine will operate in S.A.F.E. as long as the fault condition exists. To recover normal operation, two conditions must be met:
- Sensor or switch readings must be back within limits
- The EMM must be reset—stop and restart
