Polaris Virage TX 2000 Service Manual page 282

FFI™ FUEL INJECTION
Theory
S.LO-W.™ WARNING SYSTEM
FFI engines have a protective feature that prevents engine damage due to an engine cooling system overheat,
alternator output exceeding 45 volts, or excessive EMM temperature. This feature is called S.L.O.W. ™ (Speed
Limiting Overheat Warning).
A number of devices monitor engine operating conditions. All are linked directly to the EMM, which in turn is con
nected to the MFI check engine light. A complete listing of failure modes and their effect on engine operation
can be found under the Service Codes heading in the Diagnostics section.
Initiation
When the appropriate sensor or switch is activated, the EMM responds by interrupting fuel injector operation.
It begins a gradual five second drop in engine RPM to a threshold limit of approximately 3500 RPM. This is accom
plished by cutting out one cylinder at a time. The EMM turns on the MFI check engine light. As long as S.L.O.W.™
is activated, the engine will run normally below 3500 RPM. Above 3500 RPM, the engine will run poorly.
Recovery
The engine will operate as described as long as the condition that activated S.L.O.W.™ continues to exist. To
recover from S.L.O.W. ™, two conditions must be satisfied; sensor or switch parameters must be back within lim
its, and engine RPM must be reduced to idle. The system will now immediately recover and the EMM will return
engine operation to normal.
Failures that initiate S.L.O.W.™
• Code 18 - Alternator 45V Above Expected Range
• Code 25 - EMM Temperature Above Expected Range
• Code 43 - Water Temperature Sensor Above Expected Range
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