INTERNAL EMM FUNCTIONS
Start Assist Circuit (SAC)
When the ignition key is ON, the EMM Start Assist Circuit (SAC) boosts battery voltage (12 V) to 30 V on the system (55 V) circuit.
If the SAC circuit current exceeds 2 Amps, or if the SAC voltage is less than 20 V, the EMM:
| Stores service code 77 |
|---|
| EMM LED 1: ON (Running) |
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.
Exhaust Valve (V4 Models)
The EMM controls a valve that switches between two exhaust paths to provide the best exhaust tuning for various running conditions. At slower speeds and under acceleration, the system opens a longer path, allowing the engine to develop more midrange horsepower as the boat comes on plane. At higher RPMs, the path is shortened for maximum high speed performance.
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.
